================
@@ -258,6 +258,14 @@ def sext_trunc_sextload : GICombineRule<
[{ return Helper.matchSextTruncSextLoad(*${d}); }]),
(apply [{ Helper.applySextTruncSextLoad(*${d}); }])>;
+def sext_trunc_sextinreg : GICombineRule<
+ (defs root:$dst),
+ (match (G_SEXT_INREG $sir, $src, $width),
+ (G_TRUNC $trunc, $sir),
+ (G_SEXT $dst, $trunc),
+ [{ return (MRI.getType(${trunc}.getReg()).getScalarSizeInBits() >=
${width}.getImm()); }]),
----------------
jayfoad wrote:
On a related note, couldn't you split this whole combine into two independently
useful parts:
1. (sext (trunc x)) --> (sext_inreg x)
2. (sext_inreg (sext_inreg x)) --> (sext_inreg x)
https://github.com/llvm/llvm-project/pull/131312
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