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[X86] Enable popcnt false dependency breaking on Silvermont and Goldmont.

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Silvermont and Goldmont have the same issue on popcnt as Sandy Bridge, Haswell, Broadwell, and Skylake. Believe it is fixed in Goldmont Plus.

llvm-svn: 330358
This commit is contained in:
Craig Topper 2018-04-19 19:25:24 +00:00
parent a806fbf4b8
commit b3f1fd274a
2 changed files with 11 additions and 5 deletions
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8
lib/Target/X86/X86.td
View File

@ -563,7 +563,8 @@ class SilvermontProc<string Name> : ProcessorModel<Name, SLMModel, [
FeatureSlowIncDec,
FeatureSlowPMULLD,
FeatureRDRAND,
FeatureLAHFSAHF
FeatureLAHFSAHF,
FeaturePOPCNTFalseDeps
]>;
def : SilvermontProc<"silvermont">;
def : SilvermontProc<"slm">; // Legacy alias.
@ -607,7 +608,10 @@ def GLMFeatures : ProcessorFeatures<[], [
]>;
class GoldmontProc<string Name> : ProcModel<Name, SLMModel,
GLMFeatures.Value, [ ProcIntelGLM ]>;
GLMFeatures.Value, [
ProcIntelGLM,
FeaturePOPCNTFalseDeps
]>;
def : GoldmontProc<"goldmont">;
class GoldmontPlusProc<string Name> : ProcModel<Name, SLMModel,

8
test/CodeGen/X86/bitcnt-false-dep.ll
View File

@ -1,6 +1,8 @@
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=haswell -mattr=+lzcnt | FileCheck %s --check-prefix=HSW
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=skylake -mattr=+lzcnt | FileCheck %s --check-prefix=SKL
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=skx -mattr=+lzcnt | FileCheck %s --check-prefix=SKL
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=haswell | FileCheck %s --check-prefix=HSW
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=skylake | FileCheck %s --check-prefix=SKL
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=skx | FileCheck %s --check-prefix=SKL
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=silvermont -mattr=+lzcnt,+bmi | FileCheck %s --check-prefix=SKL
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=goldmont -mattr=+lzcnt,+bmi | FileCheck %s --check-prefix=SKL
; This tests a fix for bugzilla 33869 https://bugs.llvm.org/show_bug.cgi?id=33869