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stage2: implement CMP stack value with immediate

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This commit is contained in:
Jakub Konka 2022-01-04 11:11:25 +01:00
parent 1d55e4cae1
commit b3f70db438
1 changed files with 37 additions and 7 deletions
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44
src/arch/x86_64/CodeGen.zig
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@ -1785,6 +1785,15 @@ fn genBinMathOpMir(
}
},
.stack_offset => |off| {
if (off > math.maxInt(i32)) {
return self.fail("stack offset too large", .{});
}
const abi_size = dst_ty.abiSize(self.target.*);
if (abi_size > 8) {
return self.fail("TODO implement ADD/SUB/CMP for stack dst with large ABI", .{});
}
const adj_off = off + abi_size;
switch (src_mcv) {
.none => unreachable,
.undef => return self.genSetStack(dst_ty, off, .undef),
@ -1792,11 +1801,6 @@ fn genBinMathOpMir(
.ptr_stack_offset => unreachable,
.ptr_embedded_in_code => unreachable,
.register => |src_reg| {
if (off > math.maxInt(i32)) {
return self.fail("stack offset too large", .{});
}
const abi_size = dst_ty.abiSize(self.target.*);
const adj_off = off + abi_size;
_ = try self.addInst(.{
.tag = mir_tag,
.ops = (Mir.Ops{
@ -1808,8 +1812,34 @@ fn genBinMathOpMir(
});
},
.immediate => |imm| {
_ = imm;
return self.fail("TODO implement x86 ADD/SUB/CMP source immediate", .{});
const tag: Mir.Inst.Tag = switch (mir_tag) {
.add => .add_mem_imm,
.@"or" => .or_mem_imm,
.@"and" => .and_mem_imm,
.sub => .sub_mem_imm,
.xor => .xor_mem_imm,
.cmp => .cmp_mem_imm,
else => unreachable,
};
const flags: u2 = switch (abi_size) {
1 => 0b00,
2 => 0b01,
4 => 0b10,
8 => 0b11,
else => unreachable,
};
const payload = try self.addExtra(Mir.ImmPair{
.dest_off = -@intCast(i32, adj_off),
.operand = @bitCast(i32, @intCast(u32, imm)),
});
_ = try self.addInst(.{
.tag = tag,
.ops = (Mir.Ops{
.reg1 = .rbp,
.flags = flags,
}).encode(),
.data = .{ .payload = payload },
});
},
.embedded_in_code, .memory, .stack_offset => {
return self.fail("TODO implement x86 ADD/SUB/CMP source memory", .{});