[X86] Remove what little support we had for MPX

-Deprecate -mmpx and -mno-mpx command line options
-Remove CPUID detection of mpx for -march=native
-Remove MPX from all CPUs
-Remove MPX preprocessor define

I've left the "mpx" string in the backend so we don't fail on old IR, but its not connected to anything.

gcc has also deprecated these command line options. https://www.phoronix.com/scan.php?page=news_item&px=GCC-Patch-To-Drop-MPX

Differential Revision: https://reviews.llvm.org/D66669

llvm-svn: 370393

2 files changed, 0 insertions, 9 deletions

diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index a010b5a36fa..311ae6e1702 100644
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -198,7 +198,6 @@ IcelakeCommon:
 SkylakeCommon:
     setFeatureEnabledImpl(Features, "xsavec", true);
     setFeatureEnabledImpl(Features, "xsaves", true);
-    setFeatureEnabledImpl(Features, "mpx", true);
     setFeatureEnabledImpl(Features, "clflushopt", true);
     setFeatureEnabledImpl(Features, "aes", true);
     LLVM_FALLTHROUGH;
@@ -277,7 +276,6 @@ SkylakeCommon:
     setFeatureEnabledImpl(Features, "xsavec", true);
     setFeatureEnabledImpl(Features, "xsaves", true);
     setFeatureEnabledImpl(Features, "clflushopt", true);
-    setFeatureEnabledImpl(Features, "mpx", true);
     setFeatureEnabledImpl(Features, "fsgsbase", true);
     setFeatureEnabledImpl(Features, "aes", true);
     LLVM_FALLTHROUGH;
@@ -798,8 +796,6 @@ bool X86TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       HasAVX512VP2INTERSECT = true;
     } else if (Feature == "+sha") {
       HasSHA = true;
-    } else if (Feature == "+mpx") {
-      HasMPX = true;
     } else if (Feature == "+shstk") {
       HasSHSTK = true;
     } else if (Feature == "+movbe") {
@@ -1220,8 +1216,6 @@ void X86TargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__CLWB__");
   if (HasWBNOINVD)
     Builder.defineMacro("__WBNOINVD__");
-  if (HasMPX)
-    Builder.defineMacro("__MPX__");
   if (HasSHSTK)
     Builder.defineMacro("__SHSTK__");
   if (HasSGX)
@@ -1378,7 +1372,6 @@ bool X86TargetInfo::isValidFeatureName(StringRef Name) const {
       .Case("movbe", true)
       .Case("movdiri", true)
       .Case("movdir64b", true)
-      .Case("mpx", true)
       .Case("mwaitx", true)
       .Case("pclmul", true)
       .Case("pconfig", true)
@@ -1462,7 +1455,6 @@ bool X86TargetInfo::hasFeature(StringRef Feature) const {
       .Case("movbe", HasMOVBE)
       .Case("movdiri", HasMOVDIRI)
       .Case("movdir64b", HasMOVDIR64B)
-      .Case("mpx", HasMPX)
       .Case("mwaitx", HasMWAITX)
       .Case("pclmul", HasPCLMUL)
       .Case("pconfig", HasPCONFIG)
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index dd1e7db6c81..6f6cf47d65a 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -80,7 +80,6 @@ class LLVM_LIBRARY_VISIBILITY X86TargetInfo : public TargetInfo {
   bool HasAVX512IFMA = false;
   bool HasAVX512VP2INTERSECT = false;
   bool HasSHA = false;
-  bool HasMPX = false;
   bool HasSHSTK = false;
   bool HasSGX = false;
   bool HasCX8 = false;