Support return of MMX values in 64-bit mode.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65152 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 85a6c0b..efcb3f4 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1071,9 +1071,21 @@
CopyVT = MVT::f80;
}
- Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
- CopyVT, InFlag).getValue(1);
- SDValue Val = Chain.getValue(0);
+ SDValue Val;
+ if (Is64Bit && CopyVT.isVector() && CopyVT.getSizeInBits() == 64) {
+ // For x86-64, MMX values are returned in XMM0 and XMM1. Issue an
+ // extract_vector_elt to i64 and then bit_convert it to the desired type.
+ Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
+ MVT::v2i64, InFlag).getValue(1);
+ Val = Chain.getValue(0);
+ Val = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64,
+ Val, DAG.getConstant(0, MVT::i64));
+ Val = DAG.getNode(ISD::BIT_CONVERT, dl, CopyVT, Val);
+ } else {
+ Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
+ CopyVT, InFlag).getValue(1);
+ Val = Chain.getValue(0);
+ }
InFlag = Chain.getValue(2);
if (CopyVT != VA.getValVT()) {