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[InstCombine] Remove SPF guard for trunc transforms #117535

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Merged
merged 1 commit into from
Nov 25, 2024
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[InstCombine] Remove SPF guard for trunc transforms #117535

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9 changes: 0 additions & 9 deletions llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -786,15 +786,6 @@ Instruction *InstCombinerImpl::visitTrunc(TruncInst &Trunc) {
}
}

// Test if the trunc is the user of a select which is part of a
// minimum or maximum operation. If so, don't do any more simplification.
// Even simplifying demanded bits can break the canonical form of a
// min/max.
Value *LHS, *RHS;
if (SelectInst *Sel = dyn_cast<SelectInst>(Src))
if (matchSelectPattern(Sel, LHS, RHS).Flavor != SPF_UNKNOWN)
return nullptr;

// See if we can simplify any instructions used by the input whose sole
// purpose is to compute bits we don't care about.
if (SimplifyDemandedInstructionBits(Trunc))
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