[llvm] [DAG] select m, sub/add(X, C), X --> sub/add (X, and(C, m)) (PR #82441)
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Sat Feb 24 10:36:10 PST 2024
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================
@@ -11660,6 +11660,24 @@ SDValue DAGCombiner::visitSELECT(SDNode *N) {
}
}
+ // select m, sub(X, C), X --> sub (X, and(C, m))
+ if (N1.getOpcode() == ISD::SUB && N1.getOperand(0) == N2 && N1->hasOneUse() &&
+ DAG.isConstantIntBuildVectorOrConstantInt(N1.getOperand(1)) &&
+ N0.getScalarValueSizeInBits() == N1.getScalarValueSizeInBits()) {
+ return DAG.getNode(ISD::SUB, DL, N1.getValueType(), N2,
+ DAG.getNode(ISD::AND, DL, N0.getValueType(), N1.getOperand(1),
+ N0));
+ }
+
+ // select (sext m), (add X, C), X --> (add X, (and C, (sext m))))
+ if (N1.getOpcode() == ISD::ADD && N1.getOperand(0) == N2 && N1->hasOneUse() &&
+ DAG.isConstantIntBuildVectorOrConstantInt(N1.getOperand(1)) &&
+ N0.getScalarValueSizeInBits() == N1.getScalarValueSizeInBits()) {
+ return DAG.getNode(ISD::ADD, DL, N1.getValueType(), N2,
+ DAG.getNode(ISD::AND, DL, N0.getValueType(), N1.getOperand(1),
+ N0));
+ }
----------------
goldsteinn wrote:
The sub case could be `select m, (sub C, X), (sub 0, X)`
https://github.com/llvm/llvm-project/pull/82441
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