lab/sx
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

issue 0152 RESOLVED: byte-promote sub-byte (Atomic(bool)) atomic load/store

Browse Source 
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.
This commit is contained in:
agra
2026-06-21 05:42:48 +03:00
parent ea1faf7b69
commit e5586f61b8
6 changed files with 86 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
examples/expected/1705-atomics-bool-byte-promoted.exit Normal file
View File

@@ -0,0 +1 @@
0

1
examples/expected/1705-atomics-bool-byte-promoted.stderr Normal file
View File

@@ -0,0 +1 @@

3
examples/expected/1705-atomics-bool-byte-promoted.stdout Normal file
View File

@@ -0,0 +1,3 @@
init: false
after store: true
after reset: false