[llvm-branch-commits] [llvm] [InstCombine] Fold fpto[su]i of llvm.trunc (PR #231414)

[Harrison Hao via llvm-branch-commits]

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@@ -2592,6 +2592,11 @@ static Instruction *foldFPtoI(Instruction &FI, InstCombiner &IC) {
   if (FPClass.isKnownNever(Mask))
     return IC.replaceInstUsesWith(FI, ConstantInt::getNullValue(FI.getType()));
 
+  // fpto{u/s}i (trunc X) --> fpto{u/s}i X
+  Value *Src = nullptr;
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harrisonGPU wrote:

Done. (In fact, some reviewers asked me to initialize it to `nullptr` before the pattern match, so I am not sure whether the initialization is necessary.)

https://github.com/llvm/llvm-project/pull/231414