[X86] Promote i8 CTPOP to i32 instead of i16 when we have the POPCNT instruction.

The 32-bit version is shorter to encode and the zext we emit for the promotion is likely going to be a 32-bit zero extend anyway.

llvm-svn: 319468

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 54523d7233e..45246421bab 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -399,7 +399,7 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
   setTruncStoreAction(MVT::f80, MVT::f16, Expand);
 
   if (Subtarget.hasPOPCNT()) {
-    setOperationAction(ISD::CTPOP          , MVT::i8   , Promote);
+    setOperationPromotedToType(ISD::CTPOP, MVT::i8, MVT::i32);
   } else {
     setOperationAction(ISD::CTPOP          , MVT::i8   , Expand);
     setOperationAction(ISD::CTPOP          , MVT::i16  , Expand);