[X86] Add the FSRM feature (Fast Short Rep Mov) to Zen3.

Note -x86-use-fsrm-for-memcpy is still disabled by default and there's no
default behavior change.

Differential Revision: https://reviews.llvm.org/D94436

diff --git a/llvm/lib/Target/X86/X86.td b/llvm/lib/Target/X86/X86.td
index 9096d9d..c492d68 100644 (file)
--- a/llvm/lib/Target/X86/X86.td
+++ b/llvm/lib/Target/X86/X86.td
@@ -1071,7 +1071,8 @@ def ProcessorFeatures {
   list<SubtargetFeature> ZN2Tuning = ZNTuning;
   list<SubtargetFeature> ZN2Features =
     !listconcat(ZNFeatures, ZN2AdditionalFeatures);
-  list<SubtargetFeature> ZN3AdditionalFeatures = [FeatureINVPCID,
+  list<SubtargetFeature> ZN3AdditionalFeatures = [FeatureFSRM,
+                                                  FeatureINVPCID,
                                                   FeaturePKU,
                                                   FeatureVAES,
                                                   FeatureVPCLMULQDQ];

diff --git a/llvm/test/CodeGen/X86/memcpy-inline-fsrm.ll b/llvm/test/CodeGen/X86/memcpy-inline-fsrm.ll
index 9480d74..77e9762 100644 (file)
--- a/llvm/test/CodeGen/X86/memcpy-inline-fsrm.ll
+++ b/llvm/test/CodeGen/X86/memcpy-inline-fsrm.ll
@@ -4,6 +4,7 @@
 ; RUN: llc -mtriple=x86_64-linux-gnu -x86-use-fsrm-for-memcpy -mcpu=haswell < %s | FileCheck %s --check-prefix=NOFSRM
 ; RUN: llc -mtriple=x86_64-linux-gnu -x86-use-fsrm-for-memcpy -mcpu=icelake-client < %s | FileCheck %s --check-prefix=FSRM
 ; RUN: llc -mtriple=x86_64-linux-gnu -x86-use-fsrm-for-memcpy -mcpu=icelake-server < %s | FileCheck %s --check-prefix=FSRM
+; RUN: llc -mtriple=x86_64-linux-gnu -x86-use-fsrm-for-memcpy -mcpu=znver3 < %s | FileCheck %s --check-prefix=FSRM
 
 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind