Add X86 LZCNT instruction. Including instruction selection support.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141651 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 5bd3e2b..251064b 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -380,14 +380,19 @@
setOperationAction(ISD::FLT_ROUNDS_ , MVT::i32 , Custom);
setOperationAction(ISD::CTTZ , MVT::i8 , Custom);
- setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
setOperationAction(ISD::CTTZ , MVT::i16 , Custom);
- setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
setOperationAction(ISD::CTTZ , MVT::i32 , Custom);
- setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
- if (Subtarget->is64Bit()) {
+ if (Subtarget->is64Bit())
setOperationAction(ISD::CTTZ , MVT::i64 , Custom);
- setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
+
+ if (Subtarget->hasLZCNT()) {
+ setOperationAction(ISD::CTLZ , MVT::i8 , Promote);
+ } else {
+ setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
+ setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
+ setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
+ if (Subtarget->is64Bit())
+ setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
}
if (Subtarget->hasPOPCNT()) {