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spirv: lower air unwrap_error_union_err

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Robin Voetter 2023-04-10 22:31:30 +02:00
parent 0bae2caaf3
commit 78c44d63da
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GPG Key ID: E755662F227CB468
1 changed files with 28 additions and 2 deletions
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30
src/codegen/spirv.zig
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@ -402,7 +402,7 @@ pub const DeclGen = struct {
return result_id;
}
fn genUndef(self: *DeclGen, ty_ref: SpvType.Ref) Error!IdRef {
fn constUndef(self: *DeclGen, ty_ref: SpvType.Ref) Error!IdRef {
const result_id = self.spv.allocId();
try self.spv.sections.types_globals_constants.emit(self.spv.gpa, .OpUndef, .{ .id_result_type = self.typeId(ty_ref), .id_result = result_id });
return result_id;
@ -1597,7 +1597,7 @@ pub const DeclGen = struct {
.block => try self.airBlock(inst),
.load => try self.airLoad(inst),
.store => return self.airStore(inst),
.store => return self.airStore(inst),
.br => return self.airBr(inst),
.breakpoint => return,
@ -1612,6 +1612,8 @@ pub const DeclGen = struct {
.switch_br => return self.airSwitchBr(inst),
.unreach => return self.airUnreach(),
.unwrap_errunion_err => try self.airErrUnionErr(inst),
.assembly => try self.airAssembly(inst),
.call => try self.airCall(inst, .auto),
@ -2535,6 +2537,30 @@ pub const DeclGen = struct {
return try self.extractField(payload_ty_ref, err_union_id, eu_layout.payloadFieldIndex());
}
fn airErrUnionErr(self: *DeclGen, inst: Air.Inst.Index) !?IdRef {
if (self.liveness.isUnused(inst)) return null;
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const operand_id = try self.resolve(ty_op.operand);
const err_union_ty = self.air.typeOf(ty_op.operand);
const err_ty_ref = try self.resolveType(Type.anyerror, .direct);
if (err_union_ty.errorUnionSet().errorSetIsEmpty()) {
// No error possible, so just return undefined.
return try self.constUndef(err_ty_ref);
}
const payload_ty = err_union_ty.errorUnionPayload();
const eu_layout = self.errorUnionLayout(payload_ty);
if (!eu_layout.payload_has_bits) {
// If no payload, error union is represented by error set.
return operand_id;
}
return try self.extractField(err_ty_ref, operand_id, eu_layout.errorFieldIndex());
}
fn airSwitchBr(self: *DeclGen, inst: Air.Inst.Index) !void {
const target = self.getTarget();
const pl_op = self.air.instructions.items(.data)[inst].pl_op;