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AstGen: redistribute inline asm limits

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This commit is contained in:
Jacob Young 2025-03-27 12:44:10 -04:00
parent 7a2963efab
commit 06eebafadd
2 changed files with 16 additions and 16 deletions
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26
lib/std/zig/AstGen.zig
View file

@ -8854,10 +8854,10 @@ fn asmExpr(
return astgen.failNode(node, "assembly expression with no output must be marked volatile", .{});
}
}
if (full.outputs.len > 32) {
return astgen.failNode(full.outputs[32], "too many asm outputs", .{});
if (full.outputs.len >= 16) {
return astgen.failNode(full.outputs[16], "too many asm outputs", .{});
}
var outputs_buffer: [32]Zir.Inst.Asm.Output = undefined;
var outputs_buffer: [15]Zir.Inst.Asm.Output = undefined;
const outputs = outputs_buffer[0..full.outputs.len];
var output_type_bits: u32 = 0;
@ -8893,10 +8893,10 @@ fn asmExpr(
}
}
if (full.inputs.len > 32) {
if (full.inputs.len >= 32) {
return astgen.failNode(full.inputs[32], "too many asm inputs", .{});
}
var inputs_buffer: [32]Zir.Inst.Asm.Input = undefined;
var inputs_buffer: [31]Zir.Inst.Asm.Input = undefined;
const inputs = inputs_buffer[0..full.inputs.len];
for (full.inputs, 0..) |input_node, i| {
@ -8912,7 +8912,7 @@ fn asmExpr(
};
}
var clobbers_buffer: [32]u32 = undefined;
var clobbers_buffer: [63]u32 = undefined;
var clobber_i: usize = 0;
if (full.first_clobber) |first_clobber| clobbers: {
// asm ("foo" ::: "a", "b")
@ -12932,14 +12932,14 @@ const GenZir = struct {
}
gz.astgen.extra.appendSliceAssumeCapacity(args.clobbers);
// * 0b00000000_000XXXXX - `outputs_len`.
// * 0b000000XX_XXX00000 - `inputs_len`.
// * 0b0XXXXX00_00000000 - `clobbers_len`.
// * 0b00000000_0000XXXX - `outputs_len`.
// * 0b0000000X_XXXX0000 - `inputs_len`.
// * 0b0XXXXXX0_00000000 - `clobbers_len`.
// * 0bX0000000_00000000 - is volatile
const small: u16 = @as(u16, @intCast(args.outputs.len)) |
@as(u16, @intCast(args.inputs.len << 5)) |
@as(u16, @intCast(args.clobbers.len << 10)) |
(@as(u16, @intFromBool(args.is_volatile)) << 15);
const small: u16 = @as(u16, @as(u4, @intCast(args.outputs.len))) << 0 |
@as(u16, @as(u5, @intCast(args.inputs.len))) << 4 |
@as(u16, @as(u6, @intCast(args.clobbers.len))) << 9 |
@as(u16, @intFromBool(args.is_volatile)) << 15;
const new_index: Zir.Inst.Index = @enumFromInt(astgen.instructions.len);
astgen.instructions.appendAssumeCapacity(.{

6
src/Sema.zig
View file

@ -16661,9 +16661,9 @@ fn zirAsm(
const extra = sema.code.extraData(Zir.Inst.Asm, extended.operand);
const src = block.nodeOffset(extra.data.src_node);
const ret_ty_src = block.src(.{ .node_offset_asm_ret_ty = extra.data.src_node });
const outputs_len: u5 = @truncate(extended.small);
const inputs_len: u5 = @truncate(extended.small >> 5);
const clobbers_len: u5 = @truncate(extended.small >> 10);
const outputs_len: u4 = @truncate(extended.small);
const inputs_len: u5 = @truncate(extended.small >> 4);
const clobbers_len: u6 = @truncate(extended.small >> 9);
const is_volatile = @as(u1, @truncate(extended.small >> 15)) != 0;
const is_global_assembly = sema.func_index == .none;
const zir_tags = sema.code.instructions.items(.tag);