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aarch64: implement optionalPayload when mcv is register

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This commit is contained in:
Jakub Konka 2022-11-07 15:16:54 +01:00
parent 35bd5363ee
commit a07449450f
1 changed files with 24 additions and 1 deletions
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25
src/arch/aarch64/CodeGen.zig
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@ -2904,7 +2904,30 @@ fn optionalPayload(self: *Self, inst: Air.Inst.Index, mcv: MCValue, optional_ty:
const offset = @intCast(u32, optional_ty.abiSize(self.target.*) - payload_ty.abiSize(self.target.*));
switch (mcv) {
.register => return self.fail("TODO optionalPayload for registers", .{}),
.register => |source_reg| {
// TODO should we reuse the operand here?
const raw_reg = try self.register_manager.allocReg(inst, gp);
const dest_reg = raw_reg.toX();
const shift = @intCast(u6, offset * 8);
if (shift == 0) {
try self.genSetReg(payload_ty, dest_reg, mcv);
} else {
_ = try self.addInst(.{
.tag = if (payload_ty.isSignedInt())
Mir.Inst.Tag.asr_immediate
else
Mir.Inst.Tag.lsr_immediate,
.data = .{ .rr_shift = .{
.rd = dest_reg,
.rn = source_reg,
.shift = shift,
} },
});
}
return MCValue{ .register = dest_reg };
},
.stack_argument_offset => |off| {
return MCValue{ .stack_argument_offset = off + offset };
},