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cbe: add support for constraint modifiers specified after a colon

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This translates `%[name:mod]` to `%mod[name]` for C.
This commit is contained in:
Jacob Young 2022-12-02 22:20:12 -05:00
parent fdedd62365
commit e1216077f0
2 changed files with 39 additions and 5 deletions
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43
src/codegen/c.zig
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@ -4175,11 +4175,46 @@ fn airAsm(f: *Function, inst: Air.Inst.Index) !CValue {
extra_i += clobber.len / 4 + 1;
}
}
const asm_source = std.mem.sliceAsBytes(f.air.extra[extra_i..])[0..extra.data.source_len];
{
const asm_source = std.mem.sliceAsBytes(f.air.extra[extra_i..])[0..extra.data.source_len];
try writer.writeAll("__asm");
if (is_volatile) try writer.writeAll(" volatile");
try writer.print("({s}", .{fmtStringLiteral(asm_source)});
var stack = std.heap.stackFallback(256, f.object.dg.gpa);
const allocator = stack.get();
const fixed_asm_source = try allocator.alloc(u8, asm_source.len);
defer allocator.free(fixed_asm_source);
var src_i: usize = 0;
var dst_i: usize = 0;
while (src_i < asm_source.len) : (src_i += 1) {
fixed_asm_source[dst_i] = asm_source[src_i];
dst_i += 1;
if (asm_source[src_i] != '%' or src_i + 1 >= asm_source.len) continue;
src_i += 1;
if (asm_source[src_i] != '[') {
// This handles %%
fixed_asm_source[dst_i] = asm_source[src_i];
dst_i += 1;
continue;
}
const len = std.mem.indexOfScalar(u8, asm_source[src_i + 1 ..], ']') orelse
return f.fail("CBE: invalid inline asm string '{s}'", .{asm_source});
if (std.mem.indexOfScalar(u8, asm_source[src_i + 1 ..][0..len], ':')) |colon| {
const modifier = asm_source[src_i + 1 + colon + 1 .. src_i + 1 + len];
std.mem.copy(u8, fixed_asm_source[dst_i..], modifier);
dst_i += modifier.len;
const name = asm_source[src_i .. src_i + 1 + colon];
std.mem.copy(u8, fixed_asm_source[dst_i..], name);
dst_i += name.len;
src_i += len;
}
}
try writer.writeAll("__asm");
if (is_volatile) try writer.writeAll(" volatile");
try writer.print("({s}", .{fmtStringLiteral(fixed_asm_source[0..dst_i])});
}
extra_i = constraints_extra_begin;
var locals_index = locals_begin;

1
test/behavior/asm.zig
View File

@ -140,7 +140,6 @@ export fn derp() i32 {
test "asm modifiers (AArch64)" {
if (builtin.target.cpu.arch != .aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
var x: u32 = 15;
const double = asm ("add %[ret:w], %[in:w], %[in:w]"