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AstGen: fix switch expressions with all prongs noreturn

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This commit is contained in:
Andrew Kelley
2021-04-07 12:59:50 -07:00
parent 18119aae30
commit e32898b0de
1 changed files with 7 additions and 2 deletions
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9
src/AstGen.zig
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@@ -3356,8 +3356,13 @@ fn switchExpr(
switch (strat.tag) {
.break_operand => {
// Switch expressions return `true` for `nodeMayNeedMemoryLocation` thus
// this is always true.
assert(strat.elide_store_to_block_ptr_instructions);
// `elide_store_to_block_ptr_instructions` will either be true,
// or all prongs are noreturn.
if (!strat.elide_store_to_block_ptr_instructions) {
astgen.extra.appendSliceAssumeCapacity(scalar_cases_payload.items);
astgen.extra.appendSliceAssumeCapacity(multi_cases_payload.items);
return astgen.indexToRef(switch_block);
}
// There will necessarily be a store_to_block_ptr for
// all prongs, except for prongs that ended with a noreturn instruction.