Add Hardware Transactional Memory (HTM) Support

This patch adds Hardware Transaction Memory (HTM) support supported by ISA 2.07
(POWER8). The intrinsic support is based on GCC one [1], with both 'PowerPC HTM
Low Level Built-in Functions' and 'PowerPC HTM High Level Inline Functions'
implemented.

Along with builtins a new driver switch is added to enable/disable HTM
instruction support (-mhtm) and a header with common definitions (mostly to
parse the TFHAR register value). The HTM switch also sets a preprocessor builtin
HTM.

The HTM usage requires a recently newer kernel with PPC HTM enabled. Tested on
powerpc64 and powerpc64le.

This is send along a llvm patch to enabled the builtins and option switch.

[1]
https://gcc.gnu.org/onlinedocs/gcc/PowerPC-Hardware-Transactional-Memory-Built-in-Functions.html

Phabricator Review: http://reviews.llvm.org/D8248

llvm-svn: 233205

1 files changed, 10 insertions, 1 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 25ce32e4664..b1a245e1b20 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -744,6 +744,7 @@ class PPCTargetInfo : public TargetInfo {
   bool HasP8Vector;
   bool HasP8Crypto;
   bool HasQPX;
+  bool HasHTM;
 
 protected:
   std::string ABI;
@@ -751,7 +752,7 @@ protected:
 public:
   PPCTargetInfo(const llvm::Triple &Triple)
     : TargetInfo(Triple), HasVSX(false), HasP8Vector(false),
-      HasP8Crypto(false), HasQPX(false) {
+      HasP8Crypto(false), HasQPX(false), HasHTM(false) {
     BigEndian = (Triple.getArch() != llvm::Triple::ppc64le);
     LongDoubleWidth = LongDoubleAlign = 128;
     LongDoubleFormat = &llvm::APFloat::PPCDoubleDouble;
@@ -1026,6 +1027,11 @@ bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       continue;
     }
 
+    if (Feature == "htm") {
+      HasHTM = true;
+      continue;
+    }
+
     // TODO: Finish this list and add an assert that we've handled them
     // all.
   }
@@ -1180,6 +1186,8 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__POWER8_VECTOR__");
   if (HasP8Crypto)
     Builder.defineMacro("__CRYPTO__");
+  if (HasHTM)
+    Builder.defineMacro("__HTM__");
 
   // FIXME: The following are not yet generated here by Clang, but are
   //        generated by GCC:
@@ -1235,6 +1243,7 @@ bool PPCTargetInfo::hasFeature(StringRef Feature) const {
     .Case("power8-vector", HasP8Vector)
     .Case("crypto", HasP8Crypto)
     .Case("qpx", HasQPX)
+    .Case("htm", HasHTM)
     .Default(false);
 }