[X86] Disable CLWB in Cannon Lake

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

Patch by Gabor Buella

Differential Revision: https://reviews.llvm.org/D43459

llvm-svn: 325655

diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index f3ebbe6..ab76c77 100644 (file)
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -175,7 +175,8 @@ bool X86TargetInfo::initFeatureMap(
     setFeatureEnabledImpl(Features, "avx512bw", true);
     setFeatureEnabledImpl(Features, "avx512vl", true);
     setFeatureEnabledImpl(Features, "pku", true);
-    setFeatureEnabledImpl(Features, "clwb", true);
+    if (Kind != CK_Cannonlake) // CNL inherits all SKX features, except CLWB
+      setFeatureEnabledImpl(Features, "clwb", true);
     LLVM_FALLTHROUGH;
   case CK_SkylakeClient:
     setFeatureEnabledImpl(Features, "xsavec", true);

diff --git a/clang/test/Preprocessor/predefined-arch-macros.c b/clang/test/Preprocessor/predefined-arch-macros.c
index ba3cb44..ba9a5e9 100644 (file)
--- a/clang/test/Preprocessor/predefined-arch-macros.c
+++ b/clang/test/Preprocessor/predefined-arch-macros.c
@@ -974,7 +974,7 @@
 // CHECK_CNL_M32: #define __BMI2__ 1
 // CHECK_CNL_M32: #define __BMI__ 1
 // CHECK_CNL_M32: #define __CLFLUSHOPT__ 1
-// CHECK_CNL_M32: #define __CLWB__ 1
+// CHECK_CNL_M32-NOT: #define __CLWB__ 1
 // CHECK_CNL_M32: #define __F16C__ 1
 // CHECK_CNL_M32: #define __FMA__ 1
 // CHECK_CNL_M32: #define __LZCNT__ 1
@@ -1022,7 +1022,7 @@
 // CHECK_CNL_M64: #define __BMI2__ 1
 // CHECK_CNL_M64: #define __BMI__ 1
 // CHECK_CNL_M64: #define __CLFLUSHOPT__ 1
-// CHECK_CNL_M64: #define __CLWB__ 1
+// CHECK_CNL_M64-NOT: #define __CLWB__ 1
 // CHECK_CNL_M64: #define __F16C__ 1
 // CHECK_CNL_M64: #define __FMA__ 1
 // CHECK_CNL_M64: #define __LZCNT__ 1