e5586f61b8
LLVM rejects a sub-byte atomic memory access (must be byte-sized), so Atomic(bool) — bool lowers to i1 — failed verification on load/store. The atomic emitters in src/backend/llvm/ops.zig now perform a sub-byte access in its byte storage type (i8) and trunc/zext the value at the boundary (new atomicByteType helper: i8 for .bool, null otherwise). rmw/cmpxchg are left as-is on purpose — a bool rmw/CAS is rejected at the sx level (integer-only), so a sub-byte element never reaches those emitters. Regression test examples/1705-atomics-bool-byte-promoted.sx. Suite green 729/0. Unblocks Future.canceled: Atomic(bool) in the B1.2 async layer.
21 lines
869 B
Plaintext
21 lines
869 B
Plaintext
// Atomic(bool) — a sub-byte (i1) element atomically loaded/stored. LLVM
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// rejects a sub-byte atomic ("atomic memory access' size must be byte-
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// sized"), so codegen performs the access in the byte storage type (i8)
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// and trunc/zext's the value at the boundary. (rmw/cmpxchg on a bool is
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// rejected at the sx level — integer-only — so only load/store apply.)
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// Regression (issue 0152): Atomic(bool) emitted an i1 atomic that failed
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// LLVM verification; Future.canceled: Atomic(bool) in the async layer hit it.
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#import "modules/std.sx";
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#import "modules/std/atomic.sx";
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main :: () {
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a := Atomic(bool).init(false);
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print("init: {}\n", a.load(.acquire)); // false
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a.store(true, .release);
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print("after store: {}\n", a.load(.acquire)); // true
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a.store(false, .seq_cst);
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print("after reset: {}\n", a.load(.seq_cst)); // false
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}
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