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Implement asm view-of parameters pred: i64, predb: u8 = pred

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gingerBill
2026-08-12 10:33:53 +01:00
parent db41921a16
commit bef386b1fb
3 changed files with 100 additions and 14 deletions
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42
src/llvm_backend_asm.cpp
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@@ -49,9 +49,26 @@ struct lbAsmGenerate {
Entity *e = entity_of_node(op);
auto *ed = entity_op(e);
i32 idx = op_number[ed->total_index];
GB_ASSERT(idx >= 0);
asm_string = gb_string_append_fmt(asm_string, "$%d", idx);
if (ed->view_of >= 0) {
// Width-view of another operand (e.g. `p0b: u8 = p0`): emit the SOURCE
// operand's number with an LLVM width modifier, so both names share the
// one register the allocator chose, viewed at the requested width.
i32 idx = op_number[ed->view_of];
GB_ASSERT(idx >= 0);
char mod = 0;
switch (ed->view_bits) {
case 8: mod = 'b'; break; // low 8-bit (al/r11b/...)
case 16: mod = 'w'; break; // 16-bit (ax/r11w/...)
case 32: mod = 'k'; break; // 32-bit (eax/r11d/...)
case 64: mod = 'q'; break; // 64-bit (rax/r11/...)
default: GB_PANIC("asm: invalid width-view size %d", ed->view_bits); break;
}
asm_string = gb_string_append_fmt(asm_string, "${%d:%c}", idx, mod);
} else {
i32 idx = op_number[ed->total_index];
GB_ASSERT(idx >= 0);
asm_string = gb_string_append_fmt(asm_string, "$%d", idx);
}
case_end;
case_ast_node(mem_op, AsmMemoryOperand, op);
asm_string = this->write_memory_operand(asm_string, op_number, mem_op, flags&~WriteOperandFlag_PrintPrefixes);
@@ -218,7 +235,7 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
auto ret_types = array_make<LLVMTypeRef>(temporary_allocator(), 0, ops->count);
// Per-operand bookkeeping, indexed the same as `ops` (via total_index).
auto op_number = array_make<i32>(temporary_allocator(), ops->count, ops->count); // $N, or -1 for clobbers
auto op_number = array_make<i32>(temporary_allocator(), ops->count, ops->count); // $N, or -1 for clobbers/views
auto ret_slot = array_make<i32>(temporary_allocator(), ops->count, ops->count); // return-struct index, or -1
for_array(i, *ops) {
op_number[i] = -1;
@@ -259,6 +276,10 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
for_array(i, *ops) {
AsmTemplateEntityDecl const &e = (*ops)[i];
if (e.view_of >= 0) {
continue; // width-view: resolved to its source's operand, owns no slot
}
bool is_output = e.param_group == AsmTemplateEntityDeclParamGroup_Output;
bool is_alloc_scratch = e.param_group == AsmTemplateEntityDeclParamGroup_Scratch
&& e.kind == AsmTemplateEntityDecl_Register
@@ -292,6 +313,10 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
// Pass 2: inputs
for (isize i = 0; i < ops->count; i++) {
AsmTemplateEntityDecl const &e = (*ops)[i];
if (e.view_of >= 0) {
continue; // width-view: not its own input
}
if (e.param_group != AsmTemplateEntityDeclParamGroup_Input) {
continue;
}
@@ -383,6 +408,10 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
// output in Pass 1, so it is skipped here.
for (isize i = 0; i < ops->count; i++) {
AsmTemplateEntityDecl const &e = (*ops)[i];
if (e.view_of >= 0) {
continue; // width-view carries no clobber; its source owns the register
}
if (e.param_group != AsmTemplateEntityDeclParamGroup_Scratch) {
continue;
}
@@ -466,6 +495,9 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
for (isize i = 0; i < ops->count; i++) {
AsmTemplateEntityDecl const &e = (*ops)[i];
if (e.view_of >= 0) {
continue; // width-view: never a returned value
}
if (e.param_group != AsmTemplateEntityDeclParamGroup_Output) {
continue;
}
@@ -502,4 +534,4 @@ gb_internal lbValue lb_emit_asm_template_call(lbProcedure *p, Entity *entity, Ar
lbAsmGenerate_amd64 generator = {};
generator.init(entity);
return generator.emit_call(p, args);
}
}