[llvm-exegesis] Dry run mode

Sometimes we only want to ensure that we can produce snippets (all the way
through `SnippetRepetitor`!), but don't care for the execution.
E.g. all of our tests are this way.

I've built LLVM without PFM and removed my CPU from `X86PfmCounters.td`,
and this produces the expected results in that configuration.

Reviewed By: courbet

Differential Revision: https://reviews.llvm.org/D139448

diff --git a/llvm/docs/CommandGuide/llvm-exegesis.rst b/llvm/docs/CommandGuide/llvm-exegesis.rst
index bf2222e..d8f98aa 100644 (file)
--- a/llvm/docs/CommandGuide/llvm-exegesis.rst
+++ b/llvm/docs/CommandGuide/llvm-exegesis.rst
@@ -19,9 +19,10 @@ Given an LLVM opcode name and a benchmarking mode, :program:`llvm-exegesis`
 generates a code snippet that makes execution as serial (resp. as parallel) as
 possible so that we can measure the latency (resp. inverse throughput/uop decomposition)
 of the instruction.
-The code snippet is jitted and executed on the host subtarget. The time taken
-(resp. resource usage) is measured using hardware performance counters. The
-result is printed out as YAML to the standard output.
+The code snippet is jitted and, unless requested not to, executed on the
+host subtarget. The time taken (resp. resource usage) is measured using
+hardware performance counters. The result is printed out as YAML
+to the standard output.
 
 The main goal of this tool is to automatically (in)validate the LLVM's TableDef
 scheduling models. To that end, we also provide analysis of the results.
@@ -195,6 +196,14 @@ OPTIONS
  In `analysis` mode, you also need to specify at least one of the
  `-analysis-clusters-output-file=` and `-analysis-inconsistencies-output-file=`.
 
+.. option:: --skip-measurements
+
+  By default, when `-mode=` is specified, the generated snippet will be executed
+  and measured, and that requires that we are running on the hardware for which
+  the snippet was generated, and that supports performance measurements.
+  But sometimes, you just want to generate snippets, and this is exactly what
+  this options allows one to do.
+
 .. option:: -x86-lbr-sample-period=<nBranches/sample>
 
   Specify the LBR sampling period - how many branches before we take a sample.
@@ -293,10 +302,21 @@ OPTIONS
 
  If set, ignore instructions that do not have a sched class (class idx = 0).
 
+.. option:: -mtriple=<triple name>
+
+ Target triple. See `-version` for available targets.
+
 .. option:: -mcpu=<cpu name>
 
  If set, measure the cpu characteristics using the counters for this CPU. This
  is useful when creating new sched models (the host CPU is unknown to LLVM).
+ (`-mcpu=help` for details)
+
+.. option:: --analysis-override-benchmark-triple-and-cpu
+
+  By default, llvm-exegesis will analyze the benchmarks for the triple/CPU they
+  were measured for, but if you want to analyze them for some other combination
+  (specified via `-mtriple`/`-mcpu`), you can pass this flag.
 
 .. option:: --dump-object-to-disk=true
 

diff --git a/llvm/test/tools/llvm-exegesis/AArch64/lit.local.cfg b/llvm/test/tools/llvm-exegesis/AArch64/lit.local.cfg
index 392b282..a768323 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/AArch64/lit.local.cfg
+++ b/llvm/test/tools/llvm-exegesis/AArch64/lit.local.cfg
@@ -1,7 +1,10 @@
 import subprocess
 import lit.util
 
-if not ('AArch64' in config.root.targets):
+if 'native' not in config.available_features:
+    config.unsupported = True
+
+elif not ('AArch64' in config.root.targets):
     # We need support for AArch64.
     config.unsupported = True
 

diff --git a/llvm/test/tools/llvm-exegesis/Mips/lit.local.cfg b/llvm/test/tools/llvm-exegesis/Mips/lit.local.cfg
index 6cd33af..766ae9c 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/Mips/lit.local.cfg
+++ b/llvm/test/tools/llvm-exegesis/Mips/lit.local.cfg
@@ -1,7 +1,10 @@
 import subprocess
 import lit.util
 
-if not ('Mips' in config.root.targets):
+if 'native' not in config.available_features:
+    config.unsupported = True
+
+elif not ('Mips' in config.root.targets):
     # We need support for Mips.
     config.unsupported = True
 

diff --git a/llvm/test/tools/llvm-exegesis/PowerPC/latency-by-opcode-name.s b/llvm/test/tools/llvm-exegesis/PowerPC/latency-by-opcode-name.s
index a70a22e..20e473d 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/PowerPC/latency-by-opcode-name.s
+++ b/llvm/test/tools/llvm-exegesis/PowerPC/latency-by-opcode-name.s
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=ADD8 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr8 --skip-measurements -mode=latency -opcode-name=ADD8 | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/PowerPC/lit.local.cfg b/llvm/test/tools/llvm-exegesis/PowerPC/lit.local.cfg
index 076f218..135f579 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/PowerPC/lit.local.cfg
+++ b/llvm/test/tools/llvm-exegesis/PowerPC/lit.local.cfg
@@ -1,29 +1,3 @@
-import subprocess
-import lit.util
-
 if not ('PowerPC' in config.root.targets):
     # We need support for PowerPC.
     config.unsupported = True
-
-elif not ('powerpc' in config.root.host_triple):
-    # We need to be running on an PPC host.
-    config.unsupported = True
-
-else:
-    # We need libpfm to be installed and allow reading perf counters. We can
-    # only know that at runtime, so we try to measure the latency of an empty
-    # code snippet and bail out on error.
-    llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
-    if not llvm_exegesis_exe:
-        print('llvm-exegesis not found')
-        config.unsupported = True
-    else:
-      try:
-          with open(os.devnull, 'w') as quiet:
-              check_llvm_exegesis_result = subprocess.call(
-                [llvm_exegesis_exe, '-mode', 'latency', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
-      except OSError:
-          print('could not exec llvm-exegesis')
-          config.unsupported = True
-      if not check_llvm_exegesis_result == 0:
-        config.unsupported = True

diff --git a/llvm/test/tools/llvm-exegesis/PowerPC/unsupported-opcode.s b/llvm/test/tools/llvm-exegesis/PowerPC/unsupported-opcode.s
index 67348ef..49b79b8 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/PowerPC/unsupported-opcode.s
+++ b/llvm/test/tools/llvm-exegesis/PowerPC/unsupported-opcode.s
@@ -1,3 +1,3 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=SELECT_I8 2>&1 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr8 --skip-measurements -mode=latency -opcode-name=SELECT_I8 2>&1 | FileCheck %s
 
 CHECK: Unsupported opcode: isPseudo/usesCustomInserter

diff --git a/llvm/test/tools/llvm-exegesis/X86/analysis-CMOV16rm-noreg-deserialization.test b/llvm/test/tools/llvm-exegesis/X86/analysis-CMOV16rm-noreg-deserialization.test
new file mode 100644 (file)
index 0000000..e86ede8
--- /dev/null
+++ b/llvm/test/tools/llvm-exegesis/X86/analysis-CMOV16rm-noreg-deserialization.test
@@ -0,0 +1,58 @@
+# RUN: llvm-exegesis -mode=analysis -benchmarks-file=%s -analysis-clusters-output-file=- -analysis-clustering-epsilon=0.1 -analysis-inconsistency-epsilon=0.1 -analysis-numpoints=1 -analysis-clustering=naive | FileCheck -check-prefixes=CHECK-CLUSTERS %s
+
+# https://bugs.llvm.org/show_bug.cgi?id=41448
+# Verify that deserialization works. Since CMOV16rm has a variant sched class, just printing clusters is sufficient
+
+---
+mode:            uops
+key:
+  instructions:
+    - 'CMOV16rm AX AX RDI i_0x1 %noreg i_0x0 %noreg i_0x0'
+    - 'CMOV16rm BP BP RDI i_0x1 %noreg i_0x40 %noreg i_0x0'
+    - 'CMOV16rm BX BX RDI i_0x1 %noreg i_0x80 %noreg i_0x0'
+    - 'CMOV16rm CX CX RDI i_0x1 %noreg i_0xc0 %noreg i_0x0'
+    - 'CMOV16rm DX DX RDI i_0x1 %noreg i_0x100 %noreg i_0x0'
+    - 'CMOV16rm SI SI RDI i_0x1 %noreg i_0x140 %noreg i_0x0'
+    - 'CMOV16rm R8W R8W RDI i_0x1 %noreg i_0x180 %noreg i_0x0'
+    - 'CMOV16rm R9W R9W RDI i_0x1 %noreg i_0x1c0 %noreg i_0x0'
+    - 'CMOV16rm R10W R10W RDI i_0x1 %noreg i_0x200 %noreg i_0x0'
+    - 'CMOV16rm R11W R11W RDI i_0x1 %noreg i_0x240 %noreg i_0x0'
+    - 'CMOV16rm R12W R12W RDI i_0x1 %noreg i_0x280 %noreg i_0x0'
+    - 'CMOV16rm R13W R13W RDI i_0x1 %noreg i_0x2c0 %noreg i_0x0'
+    - 'CMOV16rm R14W R14W RDI i_0x1 %noreg i_0x300 %noreg i_0x0'
+    - 'CMOV16rm R15W R15W RDI i_0x1 %noreg i_0x340 %noreg i_0x0'
+  config:          ''
+  register_initial_values:
+    - 'AX=0x0'
+    - 'EFLAGS=0x0'
+    - 'BP=0x0'
+    - 'BX=0x0'
+    - 'CX=0x0'
+    - 'DX=0x0'
+    - 'SI=0x0'
+    - 'R8W=0x0'
+    - 'R9W=0x0'
+    - 'R10W=0x0'
+    - 'R11W=0x0'
+    - 'R12W=0x0'
+    - 'R13W=0x0'
+    - 'R14W=0x0'
+    - 'R15W=0x0'
+cpu_name:        znver3
+llvm_triple:     x86_64-pc-linux-gnu
+num_repetitions: 10000
+measurements:
+  - { key: Zn3Int, value: 1.0161, per_snippet_value: 14.2254 }
+  - { key: Zn3FPU, value: 0, per_snippet_value: 0 }
+  - { key: Zn3Load, value: 1.003, per_snippet_value: 14.042 }
+  - { key: Zn3Store, value: 0.0023, per_snippet_value: 0.0322 }
+  - { key: Zn3Divider, value: 0, per_snippet_value: 0 }
+  - { key: NumMicroOps, value: 1.0146, per_snippet_value: 14.2044 }
+error:           ''
+info:            instruction has tied variables, using static renaming.
+assembled_snippet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
+...
+
+
+# CHECK-CLUSTERS: {{^}}cluster_id,opcode_name,config,sched_class,
+# CHECK-CLUSTERS-NEXT: {{^}}0,

diff --git a/llvm/test/tools/llvm-exegesis/X86/analysis-naive-clusterization-same-opcode-different-sched-class.test b/llvm/test/tools/llvm-exegesis/X86/analysis-naive-clusterization-same-opcode-different-sched-class.test
index 9c8eec0..3c3af2e 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/analysis-naive-clusterization-same-opcode-different-sched-class.test
+++ b/llvm/test/tools/llvm-exegesis/X86/analysis-naive-clusterization-same-opcode-different-sched-class.test
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mcpu=znver3 -mode=analysis -benchmarks-file=%s -analysis-clusters-output-file=- -analysis-clustering-epsilon=0.1 -analysis-inconsistency-epsilon=0.1 -analysis-numpoints=1 -analysis-clustering=naive | FileCheck -check-prefixes=CHECK-CLUSTERS %s
+# RUN: llvm-exegesis -mode=analysis -benchmarks-file=%s -analysis-clusters-output-file=- -analysis-clustering-epsilon=0.1 -analysis-inconsistency-epsilon=0.1 -analysis-numpoints=1 -analysis-clustering=naive | FileCheck -check-prefixes=CHECK-CLUSTERS %s
 
 # Naive clusterization mainly groups by instruction opcode,
 # but it should also partition the benchmarks of the same opcode

diff --git a/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/inverse_throughput-by-opcode-name.s b/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/inverse_throughput-by-opcode-name.s
index 61c4280..49c020b 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/inverse_throughput-by-opcode-name.s
+++ b/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/inverse_throughput-by-opcode-name.s
@@ -1,9 +1,8 @@
-# RUN: llvm-exegesis -mode=inverse_throughput -opcode-name=ADD32rr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=inverse_throughput -opcode-name=ADD32rr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=inverse_throughput --skip-measurements -opcode-name=ADD32rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=inverse_throughput --skip-measurements -opcode-name=ADD32rr -repetition-mode=loop | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: inverse_throughput
 CHECK-NEXT: key:
 CHECK-NEXT:   instructions:
 CHECK-NEXT:     ADD32rr
-CHECK: key: inverse_throughput

diff --git a/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/lit.local.cfg b/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/lit.local.cfg
deleted file mode 100644 (file)
index c11fe88..0000000
--- a/llvm/test/tools/llvm-exegesis/X86/inverse_throughput/lit.local.cfg
+++ /dev/null
@@ -1,29 +0,0 @@
-import subprocess
-import lit.util
-
-if not ('X86' in config.root.targets):
-    # We need support for X86.
-    config.unsupported = True
-
-elif not ('x86_64' in config.root.host_triple):
-    # We need to be running on an X86 host.
-    config.unsupported = True
-
-else:
-    # We need libpfm to be installed and allow reading perf counters. We can
-    # only know that at runtime, so we try to measure the latency of an empty
-    # code snippet and bail out on error.
-    llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
-    if not llvm_exegesis_exe:
-        print('llvm-exegesis not found')
-        config.unsupported = True
-    else:
-      try:
-          with open(os.devnull, 'w') as quiet:
-              check_llvm_exegesis_inverse_throughput_result = subprocess.call(
-                [llvm_exegesis_exe, '-mode', 'inverse_throughput', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
-      except OSError:
-          print('could not exec llvm-exegesis')
-          config.unsupported = True
-      if not check_llvm_exegesis_inverse_throughput_result == 0:
-        config.unsupported = True

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-CMOV32rr.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-CMOV32rr.s
index 5def574..9f6a548 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-CMOV32rr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-CMOV32rr.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=CMOV32rr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=latency -opcode-name=CMOV32rr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=CMOV32rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=CMOV32rr -repetition-mode=loop | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-IN16rr.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-IN16rr.s
index c57b61a..4a1e66f 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-IN16rr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-IN16rr.s
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=IN16rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=IN16rr -repetition-mode=duplicate | FileCheck %s
 
 # FIXME: Sometimes fails with: 'unimplemented operand type'
 # ALLOW_RETRIES: 2

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64_32r.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64_32r.s
index 40b6db9..82c2c31 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64_32r.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64_32r.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=LEA64_32r -repetition-mode=duplicate -max-configs-per-opcode=2 | FileCheck %s
-# RUN: llvm-exegesis -mode=latency -opcode-name=LEA64_32r -repetition-mode=loop -max-configs-per-opcode=2 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=LEA64_32r -repetition-mode=duplicate -max-configs-per-opcode=2 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=LEA64_32r -repetition-mode=loop -max-configs-per-opcode=2 | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64r.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64r.s
index e5d6db2..1115118 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64r.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-LEA64r.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=LEA64r -repetition-mode=duplicate -max-configs-per-opcode=2 | FileCheck %s
-# RUN: llvm-exegesis -mode=latency -opcode-name=LEA64r -repetition-mode=loop -max-configs-per-opcode=2 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=LEA64r -repetition-mode=duplicate -max-configs-per-opcode=2 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=LEA64r -repetition-mode=loop -max-configs-per-opcode=2 | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-SBB8rr.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-SBB8rr.s
index 4ac8330..8be38e5 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-SBB8rr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-SBB8rr.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=SBB8rr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=latency -opcode-name=SBB8rr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SBB8rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SBB8rr -repetition-mode=loop | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-SETCCr-cond-codes-sweep.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-SETCCr-cond-codes-sweep.s
index 3b17ffd..d60df84 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-SETCCr-cond-codes-sweep.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-SETCCr-cond-codes-sweep.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=SETCCr --max-configs-per-opcode=1 | FileCheck %s --check-prefix=CHECK
-# RUN: llvm-exegesis -mode=latency -opcode-name=SETCCr --max-configs-per-opcode=256 | FileCheck %s --check-prefix=SWEEP
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SETCCr --max-configs-per-opcode=1 | FileCheck %s --check-prefix=CHECK
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SETCCr --max-configs-per-opcode=256 | FileCheck %s --check-prefix=SWEEP
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-SQRTSSr.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-SQRTSSr.s
index 1908b9a..5c607c1 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-SQRTSSr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-SQRTSSr.s
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=SQRTSSr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SQRTSSr -repetition-mode=loop | FileCheck %s
 
 # Check that the setup code for MXCSR does not crash the snippet.
 

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/latency-by-opcode-name.s b/llvm/test/tools/llvm-exegesis/X86/latency/latency-by-opcode-name.s
index f69f263..3121f64 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/latency-by-opcode-name.s
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/latency-by-opcode-name.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=ADD32rr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=latency -opcode-name=ADD32rr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=ADD32rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=ADD32rr -repetition-mode=loop | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/lit.local.cfg b/llvm/test/tools/llvm-exegesis/X86/latency/lit.local.cfg
deleted file mode 100644 (file)
index 994810e..0000000
--- a/llvm/test/tools/llvm-exegesis/X86/latency/lit.local.cfg
+++ /dev/null
@@ -1,29 +0,0 @@
-import subprocess
-import lit.util
-
-if not ('X86' in config.root.targets):
-    # We need support for X86.
-    config.unsupported = True
-
-elif not ('x86_64' in config.root.host_triple):
-    # We need to be running on an X86 host.
-    config.unsupported = True
-
-else:
-    # We need libpfm to be installed and allow reading perf counters. We can
-    # only know that at runtime, so we try to measure the latency of an empty
-    # code snippet and bail out on error.
-    llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
-    if not llvm_exegesis_exe:
-        print('llvm-exegesis not found')
-        config.unsupported = True
-    else:
-      try:
-          with open(os.devnull, 'w') as quiet:
-              check_llvm_exegesis_latency_result = subprocess.call(
-                [llvm_exegesis_exe, '-mode', 'latency', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
-      except OSError:
-          print('could not exec llvm-exegesis')
-          config.unsupported = True
-      if not check_llvm_exegesis_latency_result == 0:
-        config.unsupported = True

diff --git a/llvm/test/tools/llvm-exegesis/X86/latency/max-configs.test b/llvm/test/tools/llvm-exegesis/X86/latency/max-configs.test
index a980e85..98e95f0 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/latency/max-configs.test
+++ b/llvm/test/tools/llvm-exegesis/X86/latency/max-configs.test
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=latency -opcode-name=SBB8rr -max-configs-per-opcode=1 | FileCheck -check-prefixes=CHECK,CHECK1 %s
-# RUN: llvm-exegesis -mode=latency -opcode-name=SBB8rr -max-configs-per-opcode=2 | FileCheck -check-prefixes=CHECK,CHECK2 %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SBB8rr -max-configs-per-opcode=1 | FileCheck -check-prefixes=CHECK,CHECK1 %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --skip-measurements -opcode-name=SBB8rr -max-configs-per-opcode=2 | FileCheck -check-prefixes=CHECK,CHECK2 %s
 
 CHECK:      ---
 CHECK-NEXT: mode: latency

diff --git a/llvm/test/tools/llvm-exegesis/X86/lbr/Inputs/mov_add.att b/llvm/test/tools/llvm-exegesis/X86/lbr/Inputs/mov_add.att
index 8f85b39..9b2314f 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/lbr/Inputs/mov_add.att
+++ b/llvm/test/tools/llvm-exegesis/X86/lbr/Inputs/mov_add.att
@@ -1,4 +1,4 @@
-# LLVM-EXEGESIS-LIVEIN RDI
-# LLVM-EXEGESIS-DEFREG XMM1 42
+# llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64-LIVEIN RDI
+# llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64-DEFREG XMM1 42
 movq $2, %rdi
-addq $0x10, %rdi
\ No newline at end of file
+addq $0x10, %rdi

diff --git a/llvm/test/tools/llvm-exegesis/X86/lbr/lit.local.cfg b/llvm/test/tools/llvm-exegesis/X86/lbr/lit.local.cfg
index 14d4476..a188cb2 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/lbr/lit.local.cfg
+++ b/llvm/test/tools/llvm-exegesis/X86/lbr/lit.local.cfg
@@ -1,15 +1,18 @@
 import subprocess
 import lit.util
 
-if not ('X86' in config.root.targets):
+if 'native' not in config.available_features:
+    config.unsupported = True
+
+elif not ('X86' in config.root.targets):
     # We need support for X86.
     config.unsupported = True
 
 elif not ('x86_64' in config.root.host_triple):
     # We need to be running on an X86 host.
     config.unsupported = True
-    
-else:    
+
+else:
     # We need libpfm to be installed and the host to be support LBR format with cycles.
     llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
     if not llvm_exegesis_exe:

diff --git a/llvm/test/tools/llvm-exegesis/X86/lbr/mov-add.s b/llvm/test/tools/llvm-exegesis/X86/lbr/mov-add.s
index 5f72e8f..6f0762b 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/lbr/mov-add.s
+++ b/llvm/test/tools/llvm-exegesis/X86/lbr/mov-add.s
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mode=latency --repetition-mode=loop --x86-lbr-sample-period=521 --snippets-file=%p/Inputs/mov_add.att
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=latency --repetition-mode=loop --x86-lbr-sample-period=521 --snippets-file=%p/Inputs/mov_add.att
 
 
 CHECK:      ---

diff --git a/llvm/test/tools/llvm-exegesis/X86/lit.local.cfg b/llvm/test/tools/llvm-exegesis/X86/lit.local.cfg
index 6be98bd..7230f35 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/lit.local.cfg
+++ b/llvm/test/tools/llvm-exegesis/X86/lit.local.cfg
@@ -1,7 +1,3 @@
 if not ('X86' in config.root.targets):
     # We need support for X86.
     config.unsupported = True
-
-elif not ('x86_64' in config.root.host_triple):
-    # We need to be running on an X86 host.
-    config.unsupported = True
\ No newline at end of file

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/lit.local.cfg b/llvm/test/tools/llvm-exegesis/X86/uops/lit.local.cfg
deleted file mode 100644 (file)
index d3a8f3f..0000000
--- a/llvm/test/tools/llvm-exegesis/X86/uops/lit.local.cfg
+++ /dev/null
@@ -1,29 +0,0 @@
-import subprocess
-import lit.util
-
-if not ('X86' in config.root.targets):
-    # We need support for X86.
-    config.unsupported = True
-
-elif not ('x86_64' in config.root.host_triple):
-    # We need to be running on an X86 host.
-    config.unsupported = True
-
-else:
-    # We need libpfm to be installed and allow reading perf counters. We can
-    # only know that at runtime, so we try to measure the latency of an empty
-    # code snippet and bail out on error.
-    llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
-    if not llvm_exegesis_exe:
-        print('llvm-exegesis not found')
-        config.unsupported = True
-    else:
-      try:
-          with open(os.devnull, 'w') as quiet:
-              check_llvm_exegesis_uops_result = subprocess.call(
-                [llvm_exegesis_exe, '-mode', 'uops', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
-      except OSError:
-          print('could not exec llvm-exegesis')
-          config.unsupported = True
-      if not check_llvm_exegesis_uops_result == 0:
-        config.unsupported = True
\ No newline at end of file

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mi8.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mi8.s
index 6aef789..c32777c 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mi8.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mi8.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32mi8 -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32mi8 -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32mi8 -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32mi8 -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mr.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mr.s
index 0c3628f..e0d9c23 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32mr.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32mr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32mr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32mr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32mr -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32rm.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32rm.s
index b63c6e7..5d8a43d 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32rm.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD32rm.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32rm -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32rm -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32rm -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32rm -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD_F32m.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD_F32m.s
index 023fa78..3b9caa5 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD_F32m.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-ADD_F32m.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD_F32m -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD_F32m -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD_F32m -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD_F32m -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-BEXTR32rm.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-BEXTR32rm.s
index a33023c..f7c899f 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-BEXTR32rm.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-BEXTR32rm.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=BEXTR32rm -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=BEXTR32rm -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=BEXTR32rm -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=BEXTR32rm -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-BSF16rm.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-BSF16rm.s
index fdf99ff..bd79a70 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-BSF16rm.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-BSF16rm.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=BSF16rm -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=BSF16rm -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=BSF16rm -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=BSF16rm -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-BTR64mr.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-BTR64mr.s
index da622e4..8c89a8e 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-BTR64mr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-BTR64mr.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=BTR64mr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=BTR64mr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=BTR64mr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=BTR64mr -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-CMOV16rm-noreg-serialization.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-CMOV16rm-noreg-serialization.s
new file mode 100644 (file)
index 0000000..1b0fe8c
--- /dev/null
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-CMOV16rm-noreg-serialization.s
@@ -0,0 +1,11 @@
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=CMOV16rm  -benchmarks-file=- | FileCheck %s -check-prefixes=CHECK-YAML
+
+# https://bugs.llvm.org/show_bug.cgi?id=41448
+# Verify that we correctly serialize RegNo 0 as %noreg, not as an empty string!
+
+CHECK-YAML:      ---
+CHECK-YAML-NEXT: mode:            uops
+CHECK-YAML-NEXT: key:
+CHECK-YAML-NEXT:   instructions:
+CHECK-YAML-NEXT:     - 'CMOV16rm {{[A-Z0-9]+}} {{[A-Z0-9]+}} {{[A-Z0-9]+}} i_0x1 %noreg i_0x0 %noreg i_0x{{[0-9a-f]}}'
+CHECK-YAML-LAST: ...

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-CMOV16rm-noreg.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-CMOV16rm-noreg.s
deleted file mode 100644 (file)
index 3fc1f31..0000000
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-CMOV16rm-noreg.s
+++ /dev/null
@@ -1,17 +0,0 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=CMOV16rm  -benchmarks-file=%t.CMOV16rm-uops.yaml
-# RUN: FileCheck -check-prefixes=CHECK-YAML -input-file=%t.CMOV16rm-uops.yaml %s
-# RUN: llvm-exegesis -mcpu=bdver2 -mode=analysis -benchmarks-file=%t.CMOV16rm-uops.yaml -analysis-clusters-output-file=- -analysis-clustering-epsilon=0.1 -analysis-inconsistency-epsilon=0.1 -analysis-numpoints=1 -analysis-clustering=naive | FileCheck -check-prefixes=CHECK-CLUSTERS %s
-
-# https://bugs.llvm.org/show_bug.cgi?id=41448
-# 1. Verify that we correctly serialize RegNo 0 as %noreg, not as an empty string!
-# 2. Verify that deserialization works. Since CMOV16rm has a variant sched class, just printing clusters is sufficient
-
-CHECK-YAML:      ---
-CHECK-YAML-NEXT: mode:            uops
-CHECK-YAML-NEXT: key:
-CHECK-YAML-NEXT:   instructions:
-CHECK-YAML-NEXT:     - 'CMOV16rm {{[A-Z0-9]+}} {{[A-Z0-9]+}} {{[A-Z0-9]+}} i_0x1 %noreg i_0x0 %noreg i_0x{{[0-9a-f]}}'
-CHECK-YAML-LAST: ...
-
-# CHECK-CLUSTERS: {{^}}cluster_id,opcode_name,config,sched_class,
-# CHECK-CLUSTERS-NEXT: {{^}}0,

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-FLDENVm.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-FLDENVm.s
index be182d8..07aeed1 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-FLDENVm.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-FLDENVm.s
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=FLDENVm,FLDL2E -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=FLDENVm,FLDL2E -repetition-mode=duplicate | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-LEA64r.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-LEA64r.s
index 68dde0a..057b156 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-LEA64r.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-LEA64r.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=LEA64r -repetition-mode=duplicate -max-configs-per-opcode=2 | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=LEA64r -repetition-mode=loop -max-configs-per-opcode=2 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=LEA64r -repetition-mode=duplicate -max-configs-per-opcode=2 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=LEA64r -repetition-mode=loop -max-configs-per-opcode=2 | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: uops

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-POPCNT32rr.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-POPCNT32rr.s
index 67d6524..f59d5c2 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-POPCNT32rr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-POPCNT32rr.s
@@ -1,4 +1,4 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=POPCNT32rr 2>&1 | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=POPCNT32rr 2>&1 | FileCheck %s
 
 CHECK:      ---
 CHECK-NEXT: mode: uops

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-STD.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-STD.s
index c67beed..0757db9 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-STD.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-STD.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=STD -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=STD -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=STD -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=STD -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-VFMADDSS4rm.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-VFMADDSS4rm.s
index 9044fbb..b4b5172 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-VFMADDSS4rm.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-VFMADDSS4rm.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=VFMADDSS4rm -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=VFMADDSS4rm -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=VFMADDSS4rm -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=VFMADDSS4rm -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-XCHG64rr.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-XCHG64rr.s
index c73b2bc..ad4868c 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-XCHG64rr.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-XCHG64rr.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=XCHG64rr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=XCHG64rr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=XCHG64rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=XCHG64rr -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-by-opcode-name.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-by-opcode-name.s
index 5d13f20..c751ef5 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-by-opcode-name.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-by-opcode-name.s
@@ -1,5 +1,5 @@
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32rr -repetition-mode=duplicate | FileCheck %s
-# RUN: llvm-exegesis -mode=uops -opcode-name=ADD32rr -repetition-mode=loop | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32rr -repetition-mode=duplicate | FileCheck %s
+# RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -opcode-name=ADD32rr -repetition-mode=loop | FileCheck %s
 
 CHECK:      mode:            uops
 CHECK-NEXT: key:

diff --git a/llvm/test/tools/llvm-exegesis/X86/uops/uops-misspelled-div.s b/llvm/test/tools/llvm-exegesis/X86/uops/uops-misspelled-div.s
index 05e8f4d..5e4a304 100644 (file)
--- a/llvm/test/tools/llvm-exegesis/X86/uops/uops-misspelled-div.s
+++ b/llvm/test/tools/llvm-exegesis/X86/uops/uops-misspelled-div.s
@@ -1,7 +1,7 @@
-# RUN: not llvm-exegesis -mode=uops -snippets-file=%s 2>&1 | FileCheck %s
+# RUN: not llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mode=uops --skip-measurements -snippets-file=%s 2>&1 | FileCheck %s
 
-# LLVM-EXEGESIS-DEFREG CL 1
-# LLVM-EXEGESIS-DEFREG AX 1
+# llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64-DEFREG CL 1
+# llvm-exegesis -mtriple=x86_64-unknown-unknown -mcpu=x86-64-DEFREG AX 1
 div8r cl
 
 CHECK: error: invalid instruction mnemonic 'div8r'

diff --git a/llvm/test/tools/llvm-exegesis/lit.local.cfg b/llvm/test/tools/llvm-exegesis/lit.local.cfg
deleted file mode 100644 (file)
index b2fc141..0000000
--- a/llvm/test/tools/llvm-exegesis/lit.local.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-if 'native' not in config.available_features:
-    config.unsupported = True

diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
index 03e7ccc..70e3911 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
@@ -30,8 +30,11 @@ namespace llvm {
 namespace exegesis {
 
 BenchmarkRunner::BenchmarkRunner(const LLVMState &State,
-                                 InstructionBenchmark::ModeE Mode)
-    : State(State), Mode(Mode), Scratch(std::make_unique<ScratchSpace>()) {}
+                                 InstructionBenchmark::ModeE Mode,
+                                 bool BenchmarkSkipMeasurements)
+    : State(State), Mode(Mode),
+      BenchmarkSkipMeasurements(BenchmarkSkipMeasurements),
+      Scratch(std::make_unique<ScratchSpace>()) {}
 
 BenchmarkRunner::~BenchmarkRunner() = default;
 
@@ -213,6 +216,12 @@ Expected<InstructionBenchmark> BenchmarkRunner::runConfiguration(
       ObjectFile = getObjectFromBuffer(OS.str());
     }
 
+    if (BenchmarkSkipMeasurements) {
+      InstrBenchmark.Error =
+          "in --skip-measurements mode, actual measurements skipped.";
+      continue;
+    }
+
     const FunctionExecutorImpl Executor(State, std::move(ObjectFile),
                                         Scratch.get());
     auto NewMeasurements = runMeasurements(Executor);

diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.h b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.h
index b66902e..870105d 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.h
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.h
@@ -35,7 +35,8 @@ namespace exegesis {
 class BenchmarkRunner {
 public:
   explicit BenchmarkRunner(const LLVMState &State,
-                           InstructionBenchmark::ModeE Mode);
+                           InstructionBenchmark::ModeE Mode,
+                           bool BenchmarkSkipMeasurements);
 
   virtual ~BenchmarkRunner();
 
@@ -77,6 +78,7 @@ public:
 protected:
   const LLVMState &State;
   const InstructionBenchmark::ModeE Mode;
+  const bool BenchmarkSkipMeasurements;
 
 private:
   virtual Expected<std::vector<BenchmarkMeasure>>

diff --git a/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.cpp b/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.cpp
index 6cdefb8..e837bb1 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.cpp
+++ b/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.cpp
@@ -20,8 +20,9 @@ namespace exegesis {
 
 LatencyBenchmarkRunner::LatencyBenchmarkRunner(
     const LLVMState &State, InstructionBenchmark::ModeE Mode,
+    bool BenchmarkSkipMeasurements,
     InstructionBenchmark::ResultAggregationModeE ResultAgg)
-    : BenchmarkRunner(State, Mode) {
+    : BenchmarkRunner(State, Mode, BenchmarkSkipMeasurements) {
   assert((Mode == InstructionBenchmark::Latency ||
           Mode == InstructionBenchmark::InverseThroughput) &&
          "invalid mode");

diff --git a/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.h b/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.h
index b9b9efc..942cc80 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.h
+++ b/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.h
@@ -23,6 +23,7 @@ class LatencyBenchmarkRunner : public BenchmarkRunner {
 public:
   LatencyBenchmarkRunner(
       const LLVMState &State, InstructionBenchmark::ModeE Mode,
+      bool BenchmarkSkipMeasurements,
       InstructionBenchmark::ResultAggregationModeE ResultAggMode);
   ~LatencyBenchmarkRunner() override;
 

diff --git a/llvm/tools/llvm-exegesis/lib/LlvmState.cpp b/llvm/tools/llvm-exegesis/lib/LlvmState.cpp
index 7a4770d..5239e82 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/LlvmState.cpp
+++ b/llvm/tools/llvm-exegesis/lib/LlvmState.cpp
@@ -22,33 +22,55 @@
 namespace llvm {
 namespace exegesis {
 
-Expected<LLVMState> LLVMState::Create(std::string Triple, std::string CpuName,
+Expected<LLVMState> LLVMState::Create(std::string TripleName,
+                                      std::string CpuName,
                                       const StringRef Features) {
-  if (Triple.empty())
-    Triple = sys::getProcessTriple();
-  if (CpuName.empty())
-    CpuName = sys::getHostCPUName().str();
+  if (TripleName.empty())
+    TripleName = Triple::normalize(sys::getDefaultTargetTriple());
+
+  Triple TheTriple(TripleName);
+
+  // Get the target specific parser.
   std::string Error;
-  const Target *const TheTarget = TargetRegistry::lookupTarget(Triple, Error);
+  const Target *TheTarget =
+      TargetRegistry::lookupTarget(/*MArch=*/"", TheTriple, Error);
   if (!TheTarget) {
-    return llvm::make_error<llvm::StringError>(
-        "no LLVM target for triple " + Triple, llvm::inconvertibleErrorCode());
+    return llvm::make_error<llvm::StringError>("no LLVM target for triple " +
+                                                   TripleName,
+                                               llvm::inconvertibleErrorCode());
+  }
+
+  // Update Triple with the updated triple from the target lookup.
+  TripleName = TheTriple.str();
+
+  if (CpuName == "native")
+    CpuName = std::string(llvm::sys::getHostCPUName());
+
+  std::unique_ptr<MCSubtargetInfo> STI(
+      TheTarget->createMCSubtargetInfo(TripleName, CpuName, ""));
+  assert(STI && "Unable to create subtarget info!");
+  if (!STI->isCPUStringValid(CpuName)) {
+    return llvm::make_error<llvm::StringError>(Twine("invalid CPU name (")
+                                                   .concat(CpuName)
+                                                   .concat(") for triple ")
+                                                   .concat(TripleName),
+                                               llvm::inconvertibleErrorCode());
   }
   const TargetOptions Options;
   std::unique_ptr<const TargetMachine> TM(
       static_cast<LLVMTargetMachine *>(TheTarget->createTargetMachine(
-          Triple, CpuName, Features, Options, Reloc::Model::Static)));
+          TripleName, CpuName, Features, Options, Reloc::Model::Static)));
   if (!TM) {
     return llvm::make_error<llvm::StringError>(
         "unable to create target machine", llvm::inconvertibleErrorCode());
   }
 
   const ExegesisTarget *ET =
-      Triple.empty() ? &ExegesisTarget::getDefault()
-                     : ExegesisTarget::lookup(TM->getTargetTriple());
+      TripleName.empty() ? &ExegesisTarget::getDefault()
+                         : ExegesisTarget::lookup(TM->getTargetTriple());
   if (!ET) {
     return llvm::make_error<llvm::StringError>(
-        "no Exegesis target for triple " + Triple,
+        "no Exegesis target for triple " + TripleName,
         llvm::inconvertibleErrorCode());
   }
   return LLVMState(std::move(TM), ET, CpuName);

diff --git a/llvm/tools/llvm-exegesis/lib/LlvmState.h b/llvm/tools/llvm-exegesis/lib/LlvmState.h
index 55247fe..2651a85 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/LlvmState.h
+++ b/llvm/tools/llvm-exegesis/lib/LlvmState.h
@@ -39,7 +39,7 @@ public:
   // If `Triple` is empty, uses the host triple.
   // If `CpuName` is empty, uses the host CPU.
   // `Features` is intended for tests.
-  static Expected<LLVMState> Create(std::string Triple, std::string CpuName,
+  static Expected<LLVMState> Create(std::string TripleName, std::string CpuName,
                                     StringRef Features = "");
 
   const TargetMachine &getTargetMachine() const { return *TheTargetMachine; }

diff --git a/llvm/tools/llvm-exegesis/lib/Target.cpp b/llvm/tools/llvm-exegesis/lib/Target.cpp
index 9ff19d5..1ee5b31 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/Target.cpp
+++ b/llvm/tools/llvm-exegesis/lib/Target.cpp
@@ -70,6 +70,7 @@ std::unique_ptr<SnippetGenerator> ExegesisTarget::createSnippetGenerator(
 Expected<std::unique_ptr<BenchmarkRunner>>
 ExegesisTarget::createBenchmarkRunner(
     InstructionBenchmark::ModeE Mode, const LLVMState &State,
+    bool BenchmarkSkipMeasurements,
     InstructionBenchmark::ResultAggregationModeE ResultAggMode) const {
   PfmCountersInfo PfmCounters = State.getPfmCounters();
   switch (Mode) {
@@ -77,21 +78,29 @@ ExegesisTarget::createBenchmarkRunner(
     return nullptr;
   case InstructionBenchmark::Latency:
   case InstructionBenchmark::InverseThroughput:
-    if (!PfmCounters.CycleCounter) {
+    if (!BenchmarkSkipMeasurements && !PfmCounters.CycleCounter) {
       const char *ModeName = Mode == InstructionBenchmark::Latency
                                  ? "latency"
                                  : "inverse_throughput";
       return make_error<Failure>(
           Twine("can't run '")
               .concat(ModeName)
-              .concat("' mode, sched model does not define a cycle counter."));
+              .concat(
+                  "' mode, sched model does not define a cycle counter. You "
+                  "can pass --skip-measurements to skip the actual "
+                  "benchmarking."));
     }
-    return createLatencyBenchmarkRunner(State, Mode, ResultAggMode);
+    return createLatencyBenchmarkRunner(State, Mode, BenchmarkSkipMeasurements,
+                                        ResultAggMode);
   case InstructionBenchmark::Uops:
-    if (!PfmCounters.UopsCounter && !PfmCounters.IssueCounters)
-      return make_error<Failure>("can't run 'uops' mode, sched model does not "
-                                 "define uops or issue counters.");
-    return createUopsBenchmarkRunner(State, ResultAggMode);
+    if (!BenchmarkSkipMeasurements && !PfmCounters.UopsCounter &&
+        !PfmCounters.IssueCounters)
+      return make_error<Failure>(
+          "can't run 'uops' mode, sched model does not define uops or issue "
+          "counters. You can pass --skip-measurements to skip the actual "
+          "benchmarking.");
+    return createUopsBenchmarkRunner(State, BenchmarkSkipMeasurements,
+                                     ResultAggMode);
   }
   return nullptr;
 }
@@ -108,14 +117,17 @@ std::unique_ptr<SnippetGenerator> ExegesisTarget::createParallelSnippetGenerator
 
 std::unique_ptr<BenchmarkRunner> ExegesisTarget::createLatencyBenchmarkRunner(
     const LLVMState &State, InstructionBenchmark::ModeE Mode,
+    bool BenchmarkSkipMeasurements,
     InstructionBenchmark::ResultAggregationModeE ResultAggMode) const {
-  return std::make_unique<LatencyBenchmarkRunner>(State, Mode, ResultAggMode);
+  return std::make_unique<LatencyBenchmarkRunner>(
+      State, Mode, BenchmarkSkipMeasurements, ResultAggMode);
 }
 
 std::unique_ptr<BenchmarkRunner> ExegesisTarget::createUopsBenchmarkRunner(
-    const LLVMState &State,
+    const LLVMState &State, bool BenchmarkSkipMeasurements,
     InstructionBenchmark::ResultAggregationModeE /*unused*/) const {
-  return std::make_unique<UopsBenchmarkRunner>(State);
+  return std::make_unique<UopsBenchmarkRunner>(State,
+                                               BenchmarkSkipMeasurements);
 }
 
 static_assert(std::is_pod<PfmCountersInfo>::value,

diff --git a/llvm/tools/llvm-exegesis/lib/Target.h b/llvm/tools/llvm-exegesis/lib/Target.h
index 28c103a..9487869 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/Target.h
+++ b/llvm/tools/llvm-exegesis/lib/Target.h
@@ -155,6 +155,7 @@ public:
   // Creates a benchmark runner for the given mode.
   Expected<std::unique_ptr<BenchmarkRunner>> createBenchmarkRunner(
       InstructionBenchmark::ModeE Mode, const LLVMState &State,
+      bool BenchmarkSkipMeasurements,
       InstructionBenchmark::ResultAggregationModeE ResultAggMode =
           InstructionBenchmark::Min) const;
 
@@ -193,9 +194,10 @@ private:
       const LLVMState &State, const SnippetGenerator::Options &Opts) const;
   std::unique_ptr<BenchmarkRunner> virtual createLatencyBenchmarkRunner(
       const LLVMState &State, InstructionBenchmark::ModeE Mode,
+      bool BenchmarkSkipMeasurements,
       InstructionBenchmark::ResultAggregationModeE ResultAggMode) const;
   std::unique_ptr<BenchmarkRunner> virtual createUopsBenchmarkRunner(
-      const LLVMState &State,
+      const LLVMState &State, bool BenchmarkSkipMeasurements,
       InstructionBenchmark::ResultAggregationModeE ResultAggMode) const;
 
   const ExegesisTarget *Next = nullptr;

diff --git a/llvm/tools/llvm-exegesis/lib/UopsBenchmarkRunner.h b/llvm/tools/llvm-exegesis/lib/UopsBenchmarkRunner.h
index cda74eb..f9e5926 100644 (file)
--- a/llvm/tools/llvm-exegesis/lib/UopsBenchmarkRunner.h
+++ b/llvm/tools/llvm-exegesis/lib/UopsBenchmarkRunner.h
@@ -21,8 +21,9 @@ namespace exegesis {
 
 class UopsBenchmarkRunner : public BenchmarkRunner {
 public:
-  UopsBenchmarkRunner(const LLVMState &State)
-      : BenchmarkRunner(State, InstructionBenchmark::Uops) {}
+  UopsBenchmarkRunner(const LLVMState &State, bool BenchmarkSkipMeasurements)
+      : BenchmarkRunner(State, InstructionBenchmark::Uops,
+                        BenchmarkSkipMeasurements) {}
   ~UopsBenchmarkRunner() override;
 
   static constexpr const size_t kMinNumDifferentAddresses = 6;

diff --git a/llvm/tools/llvm-exegesis/llvm-exegesis.cpp b/llvm/tools/llvm-exegesis/llvm-exegesis.cpp
index 9f1317d..8da8d6d 100644 (file)
--- a/llvm/tools/llvm-exegesis/llvm-exegesis.cpp
+++ b/llvm/tools/llvm-exegesis/llvm-exegesis.cpp
@@ -35,6 +35,8 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/TargetSelect.h"
@@ -87,7 +89,8 @@ static cl::opt<exegesis::InstructionBenchmark::ModeE> BenchmarkMode(
 static cl::opt<exegesis::InstructionBenchmark::ResultAggregationModeE>
     ResultAggMode(
         "result-aggregation-mode",
-        cl::desc("How to aggregate multi-values result"), cl::cat(Options),
+        cl::desc("How to aggregate multi-values result"),
+        cl::cat(BenchmarkOptions),
         cl::values(clEnumValN(exegesis::InstructionBenchmark::Min, "min",
                               "Keep min reading"),
                    clEnumValN(exegesis::InstructionBenchmark::Max, "max",
@@ -111,6 +114,11 @@ static cl::opt<exegesis::InstructionBenchmark::RepetitionModeE> RepetitionMode(
                    "All of the above and take the minimum of measurements")),
     cl::init(exegesis::InstructionBenchmark::Duplicate));
 
+static cl::opt<bool> BenchmarkSkipMeasurements(
+    "skip-measurements",
+    cl::desc("do everything except actually performing the measurements"),
+    cl::cat(BenchmarkOptions), cl::init(false));
+
 static cl::opt<unsigned>
     NumRepetitions("num-repetitions",
                    cl::desc("number of time to repeat the asm snippet"),
@@ -177,10 +185,23 @@ static cl::opt<bool> AnalysisDisplayUnstableOpcodes(
              "instead show only such unstable opcodes"),
     cl::cat(AnalysisOptions), cl::init(false));
 
-static cl::opt<std::string> CpuName(
-    "mcpu",
-    cl::desc("cpu name to use for pfm counters, leave empty to autodetect"),
-    cl::cat(Options), cl::init(""));
+static cl::opt<bool> AnalysisOverrideBenchmarksTripleAndCpu(
+    "analysis-override-benchmark-triple-and-cpu",
+    cl::desc("By default, we analyze the benchmarks for the triple/CPU they "
+             "were measured for, but if you want to analyze them for some "
+             "other combination (specified via -mtriple/-mcpu), you can "
+             "pass this flag."),
+    cl::cat(AnalysisOptions), cl::init(false));
+
+static cl::opt<std::string>
+    TripleName("mtriple",
+               cl::desc("Target triple. See -version for available targets"),
+               cl::cat(Options));
+
+static cl::opt<std::string>
+    MCPU("mcpu",
+         cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+         cl::value_desc("cpu-name"), cl::cat(Options));
 
 static cl::opt<bool>
     DumpObjectToDisk("dump-object-to-disk",
@@ -291,28 +312,31 @@ generateSnippets(const LLVMState &State, unsigned Opcode,
 }
 
 void benchmarkMain() {
+  if (!BenchmarkSkipMeasurements) {
 #ifndef HAVE_LIBPFM
-  ExitWithError("benchmarking unavailable, LLVM was built without libpfm.");
+    ExitWithError(
+        "benchmarking unavailable, LLVM was built without libpfm. You can pass "
+        "--skip-measurements to skip the actual benchmarking.");
+#else
+    if (exegesis::pfm::pfmInitialize())
+      ExitWithError("cannot initialize libpfm");
 #endif
+  }
 
-  if (exegesis::pfm::pfmInitialize())
-    ExitWithError("cannot initialize libpfm");
-
-  InitializeAllTargets();
-  InitializeAllTargetMCs();
   InitializeAllAsmPrinters();
   InitializeAllAsmParsers();
   InitializeAllExegesisTargets();
 
-  const LLVMState State = ExitOnErr(LLVMState::Create("", CpuName));
+  const LLVMState State = ExitOnErr(LLVMState::Create(TripleName, MCPU));
 
   // Preliminary check to ensure features needed for requested
   // benchmark mode are present on target CPU and/or OS.
-  ExitOnErr(State.getExegesisTarget().checkFeatureSupport());
+  if (!BenchmarkSkipMeasurements)
+    ExitOnErr(State.getExegesisTarget().checkFeatureSupport());
 
   const std::unique_ptr<BenchmarkRunner> Runner =
       ExitOnErr(State.getExegesisTarget().createBenchmarkRunner(
-          BenchmarkMode, State, ResultAggMode));
+          BenchmarkMode, State, BenchmarkSkipMeasurements, ResultAggMode));
   if (!Runner) {
     ExitWithError("cannot create benchmark runner");
   }
@@ -411,8 +435,6 @@ static void analysisMain() {
         "and --analysis-inconsistencies-output-file must be specified");
   }
 
-  InitializeAllTargets();
-  InitializeAllTargetMCs();
   InitializeAllAsmPrinters();
   InitializeAllDisassemblers();
   InitializeAllExegesisTargets();
@@ -433,10 +455,12 @@ static void analysisMain() {
                   "is unsupported.");
   }
   auto TripleAndCpu = *TriplesAndCpus.begin();
-  if (!CpuName.empty()) {
+  if (AnalysisOverrideBenchmarksTripleAndCpu) {
     llvm::errs() << "overridding file CPU name (" << TripleAndCpu.CpuName
-                 << ") with provided CPU name (" << CpuName << ")\n";
-    TripleAndCpu.CpuName = CpuName;
+                 << ") with provided tripled (" << TripleName
+                 << ") and CPU name (" << MCPU << ")\n";
+    TripleAndCpu.LLVMTriple = TripleName;
+    TripleAndCpu.CpuName = MCPU;
   }
   llvm::errs() << "using Triple '" << TripleAndCpu.LLVMTriple << "' and CPU '"
                << TripleAndCpu.CpuName << "'\n";
@@ -474,7 +498,24 @@ static void analysisMain() {
 
 int main(int Argc, char **Argv) {
   using namespace llvm;
-  cl::ParseCommandLineOptions(Argc, Argv, "");
+
+  InitLLVM X(Argc, Argv);
+
+  // Initialize targets so we can print them when flag --version is specified.
+  InitializeAllTargetInfos();
+  InitializeAllTargets();
+  InitializeAllTargetMCs();
+
+  // Enable printing of available targets when flag --version is specified.
+  cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
+
+  cl::HideUnrelatedOptions({&llvm::exegesis::Options,
+                            &llvm::exegesis::BenchmarkOptions,
+                            &llvm::exegesis::AnalysisOptions});
+
+  cl::ParseCommandLineOptions(Argc, Argv,
+                              "llvm host machine instruction characteristics "
+                              "measurment and analysis.\n");
 
   exegesis::ExitOnErr.setExitCodeMapper([](const Error &Err) {
     if (Err.isA<exegesis::ClusteringError>())