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aarch64: alloc new mcv in bitcast if cannot reuse operand

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This commit is contained in:
Jakub Konka 2023-02-20 10:51:36 +01:00
parent 87d358024f
commit 59a9373c71
1 changed files with 19 additions and 2 deletions
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21
src/arch/aarch64/CodeGen.zig
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@ -3958,7 +3958,9 @@ 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| {
log.debug("store: register {} to {}", .{ value_reg, addr_reg });
try self.genStrRegister(value_reg, addr_reg, value_ty);
@ -5870,7 +5872,22 @@ 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 => |reg| self.register_manager.lockReg(reg),
.register_with_overflow => |rwo| self.register_manager.lockReg(rwo.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 });
}