[X86] Implement __builtin_cpu_is

This patch adds support for __builtin_cpu_is. I've tried to match the strings supported to the latest version of gcc.

Differential Revision: https://reviews.llvm.org/D35449

llvm-svn: 310657

2 files changed, 40 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index 5c48850cb41..fc0c9c85efe 100644
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -1307,6 +1307,44 @@ bool X86TargetInfo::validateCpuSupports(StringRef FeatureStr) const {
       .Default(false);
 }
 
+// We can't use a generic validation scheme for the cpus accepted here
+// versus subtarget cpus accepted in the target attribute because the
+// variables intitialized by the runtime only support the below currently
+// rather than the full range of cpus.
+bool X86TargetInfo::validateCpuIs(StringRef FeatureStr) const {
+  return llvm::StringSwitch<bool>(FeatureStr)
+      .Case("amd", true)
+      .Case("amdfam10h", true)
+      .Case("amdfam15h", true)
+      .Case("atom", true)
+      .Case("barcelona", true)
+      .Case("bdver1", true)
+      .Case("bdver2", true)
+      .Case("bdver3", true)
+      .Case("bdver4", true)
+      .Case("bonnell", true)
+      .Case("broadwell", true)
+      .Case("btver1", true)
+      .Case("btver2", true)
+      .Case("core2", true)
+      .Case("corei7", true)
+      .Case("haswell", true)
+      .Case("intel", true)
+      .Case("istanbul", true)
+      .Case("ivybridge", true)
+      .Case("knl", true)
+      .Case("nehalem", true)
+      .Case("sandybridge", true)
+      .Case("shanghai", true)
+      .Case("silvermont", true)
+      .Case("skylake", true)
+      .Case("skylake-avx512", true)
+      .Case("slm", true)
+      .Case("westmere", true)
+      .Case("znver1", true)
+      .Default(false);
+}
+
 bool X86TargetInfo::validateAsmConstraint(
     const char *&Name, TargetInfo::ConstraintInfo &Info) const {
   switch (*Name) {
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index 671b8c9c170..34c7bdfbe3d 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -382,6 +382,8 @@ public:
 
   bool validateCpuSupports(StringRef Name) const override;
 
+  bool validateCpuIs(StringRef Name) const override;
+
   bool validateAsmConstraint(const char *&Name,
                              TargetInfo::ConstraintInfo &info) const override;