80abaf1e7d
A value-position match's arms are now lowered with `target_type` set to
the merge's `result_type`, so positive and negated integer literals pick
the same width. Fixes the `PHI node operands are not the same type as the
result` failure for `if n == { case 0: 100; else: -1; }`-style returns.
Regression: examples/0043-basic-match-value-mixed-width.sx.
Gates: zig build, zig build test, run_examples.sh -> 345 passed.
32 lines
899 B
Plaintext
32 lines
899 B
Plaintext
// A value-position match (`if subject == { case … }`) returning a small
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// integer type works when arms mix positive and negated literals: every arm
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// value is lowered against the merge's result type, so the phi operands all
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// share one width.
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//
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// Regression (issue 0066): a negated-literal arm (`else: -1`) previously
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// lowered at a narrower width than the positive arms, tripping LLVM's
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// "PHI node operands are not the same type as the result".
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#import "modules/std.sx";
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sign :: (n: s32) -> s32 {
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if n == {
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case 0: 0;
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else: if n > 0 then 1 else -1;
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}
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}
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classify :: (n: s32) -> s32 {
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if n == {
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case 0: 100;
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case 1: 10;
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else: -1;
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}
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}
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main :: () -> s32 {
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print("sign: {} {} {}\n", sign(-9), sign(0), sign(9)); // -1 0 1
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print("classify: {} {} {}\n", classify(0), classify(1), classify(5)); // 100 10 -1
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0
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}
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