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Clobber manually specified registers

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This commit is contained in:
gingerBill
2026-08-12 14:29:59 +01:00
parent b32846bb35
commit ecb4495e81
1 changed files with 17 additions and 1 deletions
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18
src/llvm_backend_asm.cpp
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@@ -407,6 +407,10 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
// Pass 3: clobbers
// Only the Scratch group. Unpinned register scratch was already emitted as an
// output in Pass 1, so it is skipped here.
StringSet emitted_reg_clobbers = {};
string_set_init(&emitted_reg_clobbers);
defer (string_set_destroy(&emitted_reg_clobbers));
for (isize i = 0; i < ops->count; i++) {
AsmTemplateEntityDecl const &e = (*ops)[i];
@@ -425,6 +429,7 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
case AsmTemplateEntityDecl_Register: // pinned -> real clobber
GB_ASSERT(e.pin.len != 0);
raw("~{"); put(e.pin); raw("}");
string_set_update(&emitted_reg_clobbers, e.pin);
break;
case AsmTemplateEntityDecl_Memory: // general memory clobber
raw("~{memory}");
@@ -435,6 +440,17 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
}
}
// Explicit register clobbers from #clobber <reg>, deduped against the pinned
// scratch clobbers already emitted above.
for (String const &reg : tmpl_entity->AsmTemplate.clobber_registers_set) {
if (string_set_exists(&emitted_reg_clobbers, reg)) {
continue; // already clobbered as a pinned scratch; don't double-emit
}
sep();
raw("~{"); put(reg); raw("}");
string_set_update(&emitted_reg_clobbers, reg);
}
// Template-level clobbers derived from #clobber cc / #clobber memory.
if (tmpl_entity->AsmTemplate.clobber_cc) {
sep();
@@ -444,7 +460,7 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
raw("~{cc}"); // AArch64 uses ~{cc}
}
}
if (tmpl_entity->AsmTemplate.clobber_memory && memory_clobbered_already) {
if (tmpl_entity->AsmTemplate.clobber_memory && !memory_clobbered_already) {
sep();
raw("~{memory}");
}