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[AArch64] Assert expandMOVImm prioritizes optimal single MOVZ/N #169341

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Nov 25, 2025
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[AArch64] Assert expandMOVImm prioritizes optimal single MOVZ/N #169341

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2 changes: 2 additions & 0 deletions llvm/lib/Target/AArch64/AArch64ExpandImm.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -549,6 +549,8 @@ void AArch64_IMM::expandMOVImm(uint64_t Imm, unsigned BitSize,
// Prefer MOVZ/MOVN over ORR because of the rules for the "mov" alias.
if ((BitSize / 16) - OneChunks <= 1 || (BitSize / 16) - ZeroChunks <= 1) {
expandMOVImmSimple(Imm, BitSize, OneChunks, ZeroChunks, Insn);
assert(Insn.size() == 1 &&
"Move of immediate should have expanded to a single MOVZ/MOVN");
return;
}

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