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[InstCombine] Remove custom and(trunc(and(x,c1)),c2) fold

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This is more correctly handled by canEvaluateTruncated (one use checks etc.) and covers all the tests cases that were added for this fold.
This commit is contained in:
Simon Pilgrim 2020-10-16 13:58:25 +01:00
parent 09bc15e2ca
commit afd2da6ff6
1 changed files with 0 additions and 16 deletions
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16
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -1871,22 +1871,6 @@ Instruction *InstCombinerImpl::visitAnd(BinaryOperator &I) {
if (Instruction *Res = OptAndOp(Op0I, Op0CI, AndRHS, I))
return Res;
}
// If this is an integer truncation, and if the source is an 'and' with
// immediate, transform it. This frequently occurs for bitfield accesses.
{
Value *X = nullptr; ConstantInt *YC = nullptr;
if (match(Op0, m_Trunc(m_And(m_Value(X), m_ConstantInt(YC))))) {
// Change: and (trunc (and X, YC) to T), C2
// into : and (trunc X to T), trunc(YC) & C2
// This will fold the two constants together, which may allow
// other simplifications.
Value *NewCast = Builder.CreateTrunc(X, I.getType(), "and.shrunk");
Constant *C3 = ConstantExpr::getTrunc(YC, I.getType());
C3 = ConstantExpr::getAnd(C3, AndRHS);
return BinaryOperator::CreateAnd(NewCast, C3);
}
}
}
if (Instruction *Z = narrowMaskedBinOp(I))