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arm: alloc new mcv in bitcast if cannot reuse operand

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This commit is contained in:
Jakub Konka 2023-02-20 12:13:14 +01:00
parent 59a9373c71
commit 528c43233f
3 changed files with 23 additions and 2 deletions
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23
src/arch/arm/CodeGen.zig
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@ -2765,7 +2765,9 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
switch (value) {
.dead => unreachable,
.undef => unreachable,
.undef => {
try self.genSetReg(value_ty, addr_reg, value);
},
.register => |value_reg| {
try self.genStrRegister(value_reg, addr_reg, value_ty);
},
@ -5816,7 +5818,24 @@ fn airPtrToInt(self: *Self, inst: Air.Inst.Index) !void {
fn airBitCast(self: *Self, inst: Air.Inst.Index) !void {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const result = try self.resolveInst(ty_op.operand);
const result = if (self.liveness.isUnused(inst)) .dead else result: {
const operand = try self.resolveInst(ty_op.operand);
if (self.reuseOperand(inst, ty_op.operand, 0, operand)) break :result operand;
const operand_lock = switch (operand) {
.register,
.register_c_flag,
.register_v_flag,
=> |reg| self.register_manager.lockReg(reg),
else => null,
};
defer if (operand_lock) |lock| self.register_manager.unlockReg(lock);
const dest_ty = self.air.typeOfIndex(inst);
const dest = try self.allocRegOrMem(dest_ty, true, inst);
try self.setRegOrMem(dest_ty, dest, operand);
break :result dest;
};
return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
}

1
test/behavior/const_slice_child.zig
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@ -9,6 +9,7 @@ var argv: [*]const [*]const u8 = undefined;
test "const slice child" {
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
const strs = [_][*]const u8{ "one", "two", "three" };

1
test/behavior/eval.zig
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@ -1338,6 +1338,7 @@ test "lazy sizeof is resolved in division" {
test "lazy value is resolved as slice operand" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
const A = struct { a: u32 };