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Support [base + index<<scale] and [base + index>>scale]; Support syntax for [base]:u8 (not implemented yet)

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gingerBill
2026-08-12 09:03:31 +01:00
parent 21ad041232
commit c80fedc070
5 changed files with 103 additions and 27 deletions
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38
src/llvm_backend_asm.cpp
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@@ -6,6 +6,7 @@ struct lbAsmGenerate {
enum WriteOperandFlags : u32 {
WriteOperandFlag_PrintPrefixes = 1<<0,
WriteOperandFlag_IsScale = 1<<1,
WriteOperandFlag_IsScaleLog2 = 1<<2,
WriteOperandFlag_NONE = 0,
WriteOperandFlag_DEFAULT = WriteOperandFlag_PrintPrefixes,
@@ -62,24 +63,33 @@ struct lbAsmGenerate {
GB_ASSERT(ev.kind != ExactValue_Invalid);
switch (ev.kind) {
case ExactValue_Integer: {
String s = big_int_to_string(heap_allocator(), &ev.value_integer, 10);
if (flags & WriteOperandFlag_PrintPrefixes) {
asm_string = gb_string_appendc(asm_string, "$$");
}
asm_string = gb_string_append_length(asm_string, s.text, s.len);
gb_free(heap_allocator(), s.text);
i64 val = exact_value_to_i64(ev);
if (flags & WriteOperandFlag_IsScale) {
i64 val = exact_value_to_i64(ev);
switch (val) {
case 1: case 2: case 4: case 8:
// okay
break;
default:
error(op, "A scale must be a constant integer or an immediate with the value 1, 2, 4, or 8, got %.*s", LIT(s));
error(op, "A scale must be a constant integer or an immediate with the value 1, 2, 4, or 8, got %lld", cast(long long)val);
break;
}
} else if (flags & WriteOperandFlag_IsScaleLog2) {
switch (val) {
case 0: case 1: case 2: case 3:
// NOTE(bill): AMD64 only supports full scales
val = (cast(i64)1)<<val;
break;
default:
error(op, "A shifting scale must be a constant integer or an immediate with the value 0, 1, 2, or 3, got %lld", cast(long long)val);
break;
}
}
if (flags & WriteOperandFlag_PrintPrefixes) {
asm_string = gb_string_appendc(asm_string, "$$");
}
asm_string = gb_string_append_fmt(asm_string, "%d", cast(int)val);
break;
}
case ExactValue_Float:
@@ -137,7 +147,15 @@ struct lbAsmGenerate_amd64 : lbAsmGenerate {
asm_string = this->write_operand(asm_string, op_number, mem_op->index, flags);
if (mem_op->scale) {
asm_string = gb_string_appendc(asm_string, ",");
asm_string = this->write_operand(asm_string, op_number, mem_op->scale, (flags|WriteOperandFlag_IsScale)&~WriteOperandFlag_PrintPrefixes);
switch (mem_op->scale_op.kind) {
case Token_Mul:
asm_string = this->write_operand(asm_string, op_number, mem_op->scale, (flags|WriteOperandFlag_IsScale)&~WriteOperandFlag_PrintPrefixes);
break;
case Token_Shl:
case Token_Shr:
asm_string = this->write_operand(asm_string, op_number, mem_op->scale, (flags|WriteOperandFlag_IsScaleLog2)&~WriteOperandFlag_PrintPrefixes);
break;
}
}
}
asm_string = gb_string_appendc(asm_string, ")");