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asm: multi-instruction template computed with one operand twice

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kalsprite
2026-08-19 14:32:03 -07:00
parent bd1a2dc7f0
commit 26ae28dfb7
2 changed files with 38 additions and 1 deletions
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4
src/llvm_backend_asm.cpp
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@@ -437,7 +437,9 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
// Register output: '=' ['&'] ( '{pin}' | class-letter )
raw("=");
if (is_alloc_scratch) { // early-clobber: keep scratch off any input reg
// early-clobber: keep scratch, and any output a later instruction could read past,
// off an input's register. One instruction reads before it writes, so it is safe
if (is_alloc_scratch || tmpl_node->instructions.count > 1) {
raw("&");
}
if (e.pin.len != 0) {