Let RegisterInfo decide whether it can emit cross-class copy or not
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75955 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp
index 14acb71..5008f14 100644
--- a/lib/CodeGen/LowerSubregs.cpp
+++ b/lib/CodeGen/LowerSubregs.cpp
@@ -132,10 +132,11 @@
}
} else {
// Insert copy
- const TargetRegisterClass *TRC = TRI.getPhysicalRegisterRegClass(DstReg);
- assert(TRC == TRI.getPhysicalRegisterRegClass(SrcReg) &&
- "Extract subreg and Dst must be of same register class");
- TII.copyRegToReg(*MBB, MI, DstReg, SrcReg, TRC, TRC);
+ const TargetRegisterClass *TRCS = TRI.getPhysicalRegisterRegClass(DstReg);
+ const TargetRegisterClass *TRCD = TRI.getPhysicalRegisterRegClass(SrcReg);
+ bool Emitted = TII.copyRegToReg(*MBB, MI, DstReg, SrcReg, TRCD, TRCS);
+ (void)Emitted;
+ assert(Emitted && "Subreg and Dst must be of compatible register class");
// Transfer the kill/dead flags, if needed.
if (MI->getOperand(0).isDead())
TransferDeadFlag(MI, DstReg, TRI);