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c: support +r output constraint

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David Rubin 2025-11-27 19:16:29 -08:00
parent eef0dd4826
commit 3b29a06830
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1 changed files with 10 additions and 8 deletions
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18
src/codegen/c.zig
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@ -5478,14 +5478,16 @@ fn airAsm(f: *Function, inst: Air.Inst.Index) !CValue {
// for the string, we still use the next u32 for the null terminator.
extra_i += (constraint.len + name.len + (2 + 3)) / 4;
if (constraint.len < 2 or constraint[0] != '=' or
(constraint[1] == '{' and constraint[constraint.len - 1] != '}'))
{
return f.fail("CBE: constraint not supported: '{s}'", .{constraint});
}
// +constraint
// =constraint
if (constraint.len > 1 and
(constraint[0] == '=' or constraint[0] == '+') and
constraint[1] != '{') continue;
const is_reg = constraint[1] == '{';
if (is_reg) {
// ={reg}
if (std.mem.startsWith(u8, constraint, "={") and
std.mem.endsWith(u8, constraint, "}"))
{
const output_ty = if (output == .none) inst_ty else f.typeOf(output).childType(zcu);
try w.writeAll("register ");
const output_local = try f.allocLocalValue(.{
@ -5503,7 +5505,7 @@ fn airAsm(f: *Function, inst: Air.Inst.Index) !CValue {
}
try w.writeByte(';');
try f.object.newline();
}
} else return f.fail("CBE: constraint not supported: '{s}'", .{constraint});
}
for (inputs) |input| {
const extra_bytes = mem.sliceAsBytes(f.air.extra.items[extra_i..]);