[llvm-mca] Add another test for partial register stalls.

This test checks that a physical register is correctly allocated for the partial
write to register BX.
The ADD instruction has to wait for the write to RBX (and BX) before being
executed.

llvm-svn: 334730

diff --git a/llvm/test/tools/llvm-mca/X86/BtVer2/partial-reg-update-2.s b/llvm/test/tools/llvm-mca/X86/BtVer2/partial-reg-update-2.s
new file mode 100644 (file)
index 0000000..18929e8
--- /dev/null
+++ b/llvm/test/tools/llvm-mca/X86/BtVer2/partial-reg-update-2.s
@@ -0,0 +1,43 @@
+# RUN: llvm-mca -mtriple=x86_64-unknown-unknown -mcpu=btver2 -iterations=1 -resource-pressure=false -timeline < %s | FileCheck %s
+
+imul   %rax, %rbx
+lzcnt  %ax,  %bx
+add    %ecx, %ebx
+
+# CHECK:      Iterations:        1
+# CHECK-NEXT: Instructions:      3
+# CHECK-NEXT: Total Cycles:      10
+# CHECK-NEXT: Dispatch Width:    2
+# CHECK-NEXT: IPC:               0.30
+# CHECK-NEXT: Block RThroughput: 4.0
+
+# CHECK:      Instruction Info:
+# CHECK-NEXT: [1]: #uOps
+# CHECK-NEXT: [2]: Latency
+# CHECK-NEXT: [3]: RThroughput
+# CHECK-NEXT: [4]: MayLoad
+# CHECK-NEXT: [5]: MayStore
+# CHECK-NEXT: [6]: HasSideEffects
+
+# CHECK:      [1]    [2]    [3]    [4]    [5]    [6]    Instructions:
+# CHECK-NEXT:  2      6     4.00                        imulq  %rax, %rbx
+# CHECK-NEXT:  1      1     0.50                        lzcntw %ax, %bx
+# CHECK-NEXT:  1      1     0.50                        addl   %ecx, %ebx
+
+# CHECK:      Timeline view:
+# CHECK-NEXT: Index     0123456789
+
+# CHECK:      [0,0]     DeeeeeeER.   imulq     %rax, %rbx
+# CHECK-NEXT: [0,1]     .DeE----R.   lzcntw    %ax, %bx
+# CHECK-NEXT: [0,2]     .D=====eER   addl      %ecx, %ebx
+
+# CHECK:      Average Wait times (based on the timeline view):
+# CHECK-NEXT: [0]: Executions
+# CHECK-NEXT: [1]: Average time spent waiting in a scheduler's queue
+# CHECK-NEXT: [2]: Average time spent waiting in a scheduler's queue while ready
+# CHECK-NEXT: [3]: Average time elapsed from WB until retire stage
+
+# CHECK:            [0]    [1]    [2]    [3]
+# CHECK-NEXT: 0.     1     1.0    1.0    0.0       imulq       %rax, %rbx
+# CHECK-NEXT: 1.     1     1.0    1.0    4.0       lzcntw      %ax, %bx
+# CHECK-NEXT: 2.     1     6.0    0.0    0.0       addl        %ecx, %ebx