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spirv: intcast, trunc for strange ints

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Robin Voetter 2023-10-08 20:26:15 +02:00
parent b1499df1b8
commit e2e4e1f8b4
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1 changed files with 20 additions and 10 deletions
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30
src/codegen/spirv.zig
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@ -535,6 +535,7 @@ const DeclGen = struct {
.composite_integer,
};
},
.Enum => return self.arithmeticTypeInfo(ty.intTagType(mod)),
// As of yet, there is no vector support in the self-hosted compiler.
.Vector => self.todo("implement arithmeticTypeInfo for Vector", .{}),
// TODO: For which types is this the case?
@ -2168,6 +2169,7 @@ const DeclGen = struct {
/// non-zeros.
/// For signed integers, the value is also sign extended.
fn normalizeInt(self: *DeclGen, ty_ref: CacheRef, value_id: IdRef, info: ArithmeticTypeInfo) !IdRef {
assert(info.class != .composite_integer); // TODO
if (info.bits == info.backing_bits) {
return value_id;
}
@ -2731,25 +2733,33 @@ const DeclGen = struct {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const operand_id = try self.resolve(ty_op.operand);
const dest_ty = self.typeOfIndex(inst);
const dest_ty_id = try self.resolveTypeId(dest_ty);
const src_ty = self.typeOf(ty_op.operand);
const dst_ty = self.typeOfIndex(inst);
const src_ty_ref = try self.resolveType(src_ty, .direct);
const dst_ty_ref = try self.resolveType(dst_ty, .direct);
const mod = self.module;
const dest_info = dest_ty.intInfo(mod);
const src_info = try self.arithmeticTypeInfo(src_ty);
const dst_info = try self.arithmeticTypeInfo(dst_ty);
// TODO: Masking?
// While intcast promises that the value already fits, the upper bits of a
// strange integer may contain garbage. Therefore, mask/sign extend it before.
const src_id = try self.normalizeInt(src_ty_ref, operand_id, src_info);
if (src_info.backing_bits == dst_info.backing_bits) {
return src_id;
}
const result_id = self.spv.allocId();
switch (dest_info.signedness) {
switch (dst_info.signedness) {
.signed => try self.func.body.emit(self.spv.gpa, .OpSConvert, .{
.id_result_type = dest_ty_id,
.id_result_type = self.typeId(dst_ty_ref),
.id_result = result_id,
.signed_value = operand_id,
.signed_value = src_id,
}),
.unsigned => try self.func.body.emit(self.spv.gpa, .OpUConvert, .{
.id_result_type = dest_ty_id,
.id_result_type = self.typeId(dst_ty_ref),
.id_result = result_id,
.unsigned_value = operand_id,
.unsigned_value = src_id,
}),
}
return result_id;