[PowerPC] Add handling for ColdCC calling convention and a pass to mark

candidates with coldcc attribute.

This patch adds support for the coldcc calling convention for Power.
This changes the set of non-volatile registers. It includes a pass to stress
test the implementation by marking all static directly called functions with
the coldcc attribute through the option -enable-coldcc-stress-test. It also
includes an option, -ppc-enable-coldcc, to add the coldcc attribute to
functions which are cold at all call sites based on BlockFrequencyInfo when
the containing function does not call any non cold functions.

Differential Revision: https://reviews.llvm.org/D38413

llvm-svn: 322721

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index b744cae51ed..e046984ffc3 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -226,6 +226,10 @@ bool TargetTransformInfo::shouldBuildLookupTablesForConstant(Constant *C) const
   return TTIImpl->shouldBuildLookupTablesForConstant(C);
 }
 
+bool TargetTransformInfo::useColdCCForColdCall(Function &F) const {
+  return TTIImpl->useColdCCForColdCall(F);
+}
+
 unsigned TargetTransformInfo::
 getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const {
   return TTIImpl->getScalarizationOverhead(Ty, Insert, Extract);