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[6.2] Fix assertion failure when performing constant-evaluation through basic blocks with non-constant arguments #80959

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Merged
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Apr 22, 2025
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[6.2] Fix assertion failure when performing constant-evaluation through basic blocks with non-constant arguments #80959

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4 changes: 2 additions & 2 deletions lib/SILOptimizer/Utils/ConstExpr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1785,8 +1785,8 @@ ConstExprFunctionState::evaluateInstructionAndGetNext(
// Set up basic block arguments.
for (unsigned i = 0, e = br->getNumArgs(); i != e; ++i) {
auto argument = getConstantValue(br->getArg(i));
if (!argument.isConstant())
return {std::nullopt, argument};
// Do not fail if an argument is not constant because we still know enough to know what the next instruction will be.
// Failure may occur later, however, if/when this unknown argument value is used by an instruction in the target basic block.
setValue(destBB->getArgument(i), argument);
}
// Set the instruction pointer to the first instruction of the block.
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