If we have ScalarSSE, we can select bitconvert into single instructions.
This compiles bitcast.ll:test3/test4 into:
_test3:
movd %xmm0, %eax
ret
_test4:
movd %edi, %xmm0
ret
llvm-svn: 32230
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 13d606b..c139dd2 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -145,8 +145,10 @@
}
// TODO: when we have SSE, these could be more efficient, by using movd/movq.
- setOperationAction(ISD::BIT_CONVERT , MVT::f32 , Expand);
- setOperationAction(ISD::BIT_CONVERT , MVT::i32 , Expand);
+ if (!X86ScalarSSE) {
+ setOperationAction(ISD::BIT_CONVERT , MVT::f32 , Expand);
+ setOperationAction(ISD::BIT_CONVERT , MVT::i32 , Expand);
+ }
if (Subtarget->is64Bit()) {
setOperationAction(ISD::BIT_CONVERT , MVT::f64 , Expand);
setOperationAction(ISD::BIT_CONVERT , MVT::i64 , Expand);