================
@@ -52,8 +52,16 @@ LiveInterval
&LiveRangeEdit::createEmptyIntervalFrom(Register OldReg,
return LI;
}
-Register LiveRangeEdit::createFrom(Register OldReg) {
+Register LiveRangeEdit::createFrom(Register OldReg,
+ const TargetRegisterClass *RC) {
Register VReg = MRI.cloneVirtualRegister(OldReg);
+
+ // If RC is given, set it now. This is needed for cloning a new VReg with a
+ // smaller RC from its original virtual register, mainly used for subreg
+ // reload. The cloning is done first to ensure the vreg flags are preserved.
+ if (RC)
+ MRI.setRegClass(VReg, RC);
----------------
cdevadas wrote:
You mean, a compatible subregister of the OldReg - the superclass?
https://github.com/llvm/llvm-project/pull/174999
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