Use COPY in X86FastISel::X86SelectRet.
Don't try a cross-class copy. That is very unlikely anywy since return value
registers are usually register class friendly. (%EAX, %XMM0, etc).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108074 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 9ff87a8..ce2517a 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -757,13 +757,11 @@
unsigned SrcReg = Reg + VA.getValNo();
unsigned DstReg = VA.getLocReg();
const TargetRegisterClass* SrcRC = MRI.getRegClass(SrcReg);
- const TargetRegisterClass* DstRC = TRI.getMinimalPhysRegClass(DstReg);
- bool Emitted = TII.copyRegToReg(*FuncInfo.MBB, FuncInfo.InsertPt,
- DstReg, SrcReg, DstRC, SrcRC, DL);
-
- // If the target couldn't make the copy for some reason, bail.
- if (!Emitted)
+ // Avoid a cross-class copy. This is very unlikely.
+ if (!SrcRC->contains(DstReg))
return false;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ DstReg).addReg(SrcReg);
// Mark the register as live out of the function.
MRI.addLiveOut(VA.getLocReg());