[llvm] [InstCombine]: Eliminate redundant modulus for urem (PR #157644)
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Tue Sep 9 08:21:22 PDT 2025
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@@ -2473,6 +2473,16 @@ Instruction *InstCombinerImpl::visitURem(BinaryOperator &I) {
}
}
+ Value *A;
+ const APInt *Op1Cst, *BCst;
+ // urem(urem(A, BCst), Op1Cst) -> urem(A, Op1Cst)
+ // iff urem(BCst, Op1Cst) == 0
+ if (match(Op0, m_URem(m_Value(A), m_APInt(BCst))) &&
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kper wrote:
ok, can you rerun the benchmark? (I am not sure whether I need rights for that)
https://github.com/llvm/llvm-project/pull/157644
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