Add patterns for the x86 popcnt instruction.
- Also adds a new POPCNT subtarget feature that is currently enabled if the target
supports SSE4.2 (nehalem) or SSE4A (barcelona).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120917 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 0bbf990..478bf71 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -285,21 +285,27 @@
setOperationAction(ISD::FREM , MVT::f80 , Expand);
setOperationAction(ISD::FLT_ROUNDS_ , MVT::i32 , Custom);
- setOperationAction(ISD::CTPOP , MVT::i8 , Expand);
setOperationAction(ISD::CTTZ , MVT::i8 , Custom);
setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
- setOperationAction(ISD::CTPOP , MVT::i16 , Expand);
setOperationAction(ISD::CTTZ , MVT::i16 , Custom);
setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
- setOperationAction(ISD::CTPOP , MVT::i32 , Expand);
setOperationAction(ISD::CTTZ , MVT::i32 , Custom);
setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
if (Subtarget->is64Bit()) {
- setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
setOperationAction(ISD::CTTZ , MVT::i64 , Custom);
setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
}
+ if (Subtarget->hasPOPCNT()) {
+ setOperationAction(ISD::CTPOP , MVT::i8 , Promote);
+ } else {
+ setOperationAction(ISD::CTPOP , MVT::i8 , Expand);
+ setOperationAction(ISD::CTPOP , MVT::i16 , Expand);
+ setOperationAction(ISD::CTPOP , MVT::i32 , Expand);
+ if (Subtarget->is64Bit())
+ setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
+ }
+
setOperationAction(ISD::READCYCLECOUNTER , MVT::i64 , Custom);
setOperationAction(ISD::BSWAP , MVT::i16 , Expand);