[SystemZ] Use POPCNT instruction on z196

We already exploit a number of instructions specific to z196,
but not yet POPCNT.  Add support for the population-count
facility, MC support for the POPCNT instruction, CodeGen
support for using POPCNT, and implement the getPopcntSupport
TargetTransformInfo hook.

llvm-svn: 233689

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
index d96515adce4..d4989130679 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
@@ -60,6 +60,8 @@ public:
   unsigned getIntImmCost(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
                          Type *Ty);
 
+  TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth);
+
   /// @}
 };