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Fixing SPIR-V header generator magic + Adding Zig compiler version to SPIR-V OpSource (#25435)

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* fixing Zig generator magic in SPIR-V header; adding zig compiler version to SPIR-V OpSource

* Update src/codegen/spirv/Module.zig

Co-authored-by: rpkak <67059904+rpkak@users.noreply.github.com>

---------

Co-authored-by: rpkak <67059904+rpkak@users.noreply.github.com>
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kbz_8 2025-11-04 05:40:29 +01:00 • committed by GitHub
parent ee4df4ad3e
commit c603d27f90
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2 changed files with 15 additions and 4 deletions
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15
src/codegen/spirv/Module.zig
View file

@ -425,10 +425,21 @@ pub fn finalize(module: *Module, gpa: Allocator) ![]Word {
},
};
const zig_version = @import("builtin").zig_version;
const zig_spirv_compiler_version = comptime (zig_version.major << 12) | (zig_version.minor << 7) | zig_version.patch;
// A SPIR-V Generator Magic Number is a 32 bit word: The high order 16
// bits are a tool ID, which should be unique across all SPIR-V
// generators. The low order 16 bits are reserved for use as a tool
// version number, or any other purpose the tool supplier chooses.
// Only the tool IDs are reserved with Khronos.
// See https://github.com/KhronosGroup/SPIRV-Headers/blob/f2e4bd213104fe323a01e935df56557328d37ac8/include/spirv/spir-v.xml#L17C5-L21C54
const generator_id: u32 = (spec.zig_generator_id << 16) | zig_spirv_compiler_version;
const header = [_]Word{
spec.magic_number,
version.toWord(),
spec.zig_generator_id,
generator_id,
module.idBound(),
0, // Schema (currently reserved for future use)
};
@ -437,7 +448,7 @@ pub fn finalize(module: *Module, gpa: Allocator) ![]Word {
defer source.deinit(module.gpa);
try module.sections.debug_strings.emit(module.gpa, .OpSource, .{
.source_language = .zig,
.version = 0,
.version = zig_spirv_compiler_version,
// We cannot emit these because the Khronos translator does not parse this instruction
// correctly.
// See https://github.com/KhronosGroup/SPIRV-LLVM-Translator/issues/2188

4
src/link/SpirV/BinaryModule.zig
View file

@ -63,7 +63,7 @@ pub fn finalize(self: BinaryModule, a: Allocator) ![]Word {
result[0] = spec.magic_number;
result[1] = @bitCast(self.version);
result[2] = spec.zig_generator_id;
result[2] = @bitCast(self.generator_magic);
result[3] = self.id_bound;
result[4] = 0; // Schema
@ -196,7 +196,7 @@ pub const Parser = struct {
var binary = BinaryModule{
.version = @bitCast(module[1]),
.generator_magic = module[2],
.generator_magic = @bitCast(module[2]),
.id_bound = module[3],
.instructions = module[header_words..],
.ext_inst_map = .{},