[llvm] r325654 - [X86] Disable CLWB for Cannon Lake

[Craig Topper via llvm-commits]

Author: ctopper
Date: Tue Feb 20 16:15:48 2018
New Revision: 325654

URL: http://llvm.org/viewvc/llvm-project?rev=325654&view=rev
Log:
[X86] Disable CLWB for Cannon Lake

Cannon Lake does not support CLWB, therefore it
does not include all features listed under SKX anymore.

Instead, enumerate all SKX features with the exception of CLWB.

Patch by Gabor Buella

Differential Revision: https://reviews.llvm.org/D43380

Modified:
    llvm/trunk/lib/Target/X86/X86.td
    llvm/trunk/test/CodeGen/X86/clwb.ll

Modified: llvm/trunk/lib/Target/X86/X86.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86.td?rev=325654&r1=325653&r2=325654&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86.td (original)
+++ llvm/trunk/lib/Target/X86/X86.td Tue Feb 20 16:15:48 2018
@@ -781,7 +781,13 @@ class SkylakeServerProc<string Name> : P
 def : SkylakeServerProc<"skylake-avx512">;
 def : SkylakeServerProc<"skx">; // Legacy alias.
 
-def CNLFeatures : ProcessorFeatures<SKXFeatures.Value, [
+def CNLFeatures : ProcessorFeatures<SKLFeatures.Value, [
+  FeatureAVX512,
+  FeatureCDI,
+  FeatureDQI,
+  FeatureBWI,
+  FeatureVLX,
+  FeaturePKU,
   FeatureVBMI,
   FeatureIFMA,
   FeatureSHA

Modified: llvm/trunk/test/CodeGen/X86/clwb.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/clwb.ll?rev=325654&r1=325653&r2=325654&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/clwb.ll (original)
+++ llvm/trunk/test/CodeGen/X86/clwb.ll Tue Feb 20 16:15:48 2018
@@ -1,5 +1,12 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; NOTE: clwb is available in Skylake Server, not available in the newer
+; NOTE: Cannon Lake arch, but available again in the newer Ice Lake arch.
 ; RUN: llc < %s -mtriple=i686-apple-darwin -mattr=clwb | FileCheck %s
+; RUN: llc < %s -mtriple=i686-apple-darwin -mcpu=skx | FileCheck %s
+; RUN: not llc < %s -mtriple=i686-apple-darwin -mcpu=cannonlake 2>&1 | FileCheck %s --check-prefix=CNL
+; RUN: llc < %s -mtriple=i686-apple-darwin -mcpu=icelake | FileCheck %s
+
+; CNL: LLVM ERROR: Cannot select: intrinsic %llvm.x86.clwb
 
 define void @clwb(i8* %p) nounwind {
 ; CHECK-LABEL: clwb: