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CBE: fix liveness issue with wrapping optionals

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This commit is contained in:
Andrew Kelley 2022-12-03 21:03:10 -07:00
parent 4a6deaff5f
commit cc8bcae8c0
1 changed files with 12 additions and 6 deletions
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18
src/codegen/c.zig
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@ -5324,14 +5324,22 @@ fn airWrapOptional(f: *Function, inst: Air.Inst.Index) !CValue {
const inst_ty = f.air.typeOfIndex(inst);
const payload = try f.resolveInst(ty_op.operand);
if (inst_ty.optionalReprIsPayload()) return payload;
try reap(f, inst, &.{ty_op.operand});
const writer = f.object.writer();
if (inst_ty.optionalReprIsPayload()) {
const local = try f.allocLocal(inst, inst_ty);
try f.writeCValue(writer, local, .Other);
try writer.writeAll(" = ");
try f.writeCValue(writer, payload, .Other);
try writer.writeAll(";\n");
return local;
}
const payload_ty = f.air.typeOf(ty_op.operand);
const target = f.object.dg.module.getTarget();
const is_array = lowersToArray(payload_ty, target);
try reap(f, inst, &.{ty_op.operand});
const writer = f.object.writer();
const local = try f.allocLocal(inst, inst_ty);
if (!is_array) {
try f.writeCValue(writer, local, .Other);
@ -5340,9 +5348,7 @@ fn airWrapOptional(f: *Function, inst: Air.Inst.Index) !CValue {
try writer.writeAll("; ");
}
try f.writeCValue(writer, local, .Other);
try writer.writeAll(".is_null = ");
try f.object.dg.renderValue(writer, Type.bool, Value.false, .Initializer);
try writer.writeAll(";\n");
try writer.writeAll(".is_null = false;\n");
if (is_array) {
try writer.writeAll("memcpy(");
try f.writeCValueMember(writer, local, .{ .identifier = "payload" });