[llvm-branch-commits] [llvm] PPC: Fix extsw elimination when the input reads a subregister (PR #208052)

Sun, 20 Sep 2026 04:46:48 -0700 

================
@@ -1012,11 +1012,13 @@ bool PPCMIPeephole::simplifyCode() {
         if (!NarrowReg.isVirtual())
           break;
 
+        unsigned NarrowSubReg = MI.getOperand(1).getSubReg();
----------------
arsenm wrote:

The last revision had a NarrowSubReg check on the SrcOpcode if before, but it 
was removed 

https://github.com/llvm/llvm-project/pull/208052
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