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[DAG] Update canCreateUndefOrPoison to handle ISD::VECTOR_COMPRESS #168010

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Merged
merged 6 commits into from
Nov 19, 2025
Merged

[DAG] Update canCreateUndefOrPoison to handle ISD::VECTOR_COMPRESS #168010

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97988f6
[SelectionDAG] Update canCreateUndefOrPoison to handle VECTOR_COMPRES…
Michael-Chen-NJU Nov 14, 2025
a4e0574
[DAG] Enhance canCreateUndefOrPoison for VECTOR_COMPRESS and add test…
Michael-Chen-NJU Nov 17, 2025
1e3bc70
[DAG] Removing undef
Michael-Chen-NJU Nov 17, 2025
d67fee9
[DAG] Add negative test case for freeze elimination in vector.compress
Michael-Chen-NJU Nov 17, 2025
b4d8f82
[DAG] Refactor canCreateUndefOrPoison for VECTOR_COMPRESS and update …
Michael-Chen-NJU Nov 18, 2025
fb4cee2
Merge branch 'main' into fix-167710-vector-compress
RKSimon Nov 19, 2025
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5 changes: 5 additions & 0 deletions llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5702,6 +5702,11 @@ bool SelectionDAG::canCreateUndefOrPoison(SDValue Op, const APInt &DemandedElts,
return false;
}

case ISD::VECTOR_COMPRESS:
// Return true only if undef is checked and at least one element is
// demanded.
return !PoisonOnly && !DemandedElts.isZero();

default:
// Allow the target to implement this method for its nodes.
if (Opcode >= ISD::BUILTIN_OP_END || Opcode == ISD::INTRINSIC_WO_CHAIN ||
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