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Add comments to indicate the implemention we'd like to have, but can't right now.

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This commit is contained in:
Nick Lewycky 2019-10-11 11:25:16 -07:00
parent 0f712c90ab
commit 8b937afc1f
1 changed files with 24 additions and 18 deletions
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42
lib/singlepass-backend/src/codegen_x64.rs
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@ -2823,30 +2823,34 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
&mut self.machine,
&mut self.value_stack,
|a, src1, src2, dst| {
// TODO: use temp_gpr (or at least check that src2 isn't
// XMMOrMemory that uses AX or DX.
a.emit_mov(Size::S32, Location::XMM(src1), Location::GPR(GPR::RAX));
// TODO: we don't have access to 'machine' here.
//let tmp1 = self.machine.acquire_temp_gpr().unwrap();
//let tmp2 = self.machine.acquire_temp_gpr().unwrap();
let tmp1 = GPR::RAX;
let tmp2 = GPR::RDX;
a.emit_mov(Size::S32, Location::XMM(src1), Location::GPR(tmp1));
match src2 {
XMMOrMemory::XMM(x) => {
a.emit_mov(Size::S32, Location::XMM(x), Location::GPR(GPR::RDX))
a.emit_mov(Size::S32, Location::XMM(x), Location::GPR(tmp2))
}
XMMOrMemory::Memory(base, disp) => {
a.emit_mov(Size::S32, Location::Memory(base, disp), Location::GPR(tmp2))
}
XMMOrMemory::Memory(base, disp) => a.emit_mov(
Size::S32,
Location::Memory(base, disp),
Location::GPR(GPR::RDX),
),
};
let tmp_xmm = if dst != src1 && XMMOrMemory::XMM(dst) != src2 {
dst
let (tmp_xmm, _release_tmp_xmm) = if dst != src1 && XMMOrMemory::XMM(dst) != src2
{
(dst, false)
} else {
// TODO: we don't have access to 'machine' here.
//(self.machine.acquire_temp_xmm().unwrap(), true)
if src1 == XMM::XMM0 {
if src2 == XMMOrMemory::XMM(XMM::XMM1) {
XMM::XMM2
(XMM::XMM2, false)
} else {
XMM::XMM1
(XMM::XMM1, false)
}
} else {
XMM::XMM0
(XMM::XMM0, false)
}
};
match src2 {
@ -2863,7 +2867,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
let do_vminss = a.get_label();
a.emit_jmp(Condition::NotEqual, do_vminss);
a.emit_jmp(Condition::ParityEven, do_vminss);
a.emit_cmp(Size::S32, Location::GPR(GPR::RAX), Location::GPR(GPR::RDX));
a.emit_cmp(Size::S32, Location::GPR(tmp1), Location::GPR(tmp2));
a.emit_jmp(Condition::Equal, do_vminss);
static NEG_ZERO: u128 = 0x80000000;
match src2 {
@ -2871,12 +2875,12 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
a.emit_mov(
Size::S64,
Location::Imm64((&NEG_ZERO as *const u128) as u64),
Location::GPR(GPR::RDX),
Location::GPR(tmp2),
);
a.emit_mov(Size::S64, Location::Memory(GPR::RDX, 0), Location::XMM(x));
a.emit_mov(Size::S64, Location::Memory(tmp2, 0), Location::XMM(x));
}
XMMOrMemory::Memory(base, disp) => {
let neg_zero_base = if base == GPR::RDX { GPR::RAX } else { GPR::RDX };
let neg_zero_base = if base == tmp2 { tmp1 } else { tmp2 };
a.emit_mov(
Size::S64,
Location::Imm64((&NEG_ZERO as *const u128) as u64),
@ -2891,6 +2895,8 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
};
a.emit_label(do_vminss);
a.emit_vminss(src1, src2, dst);
// TODO: we don't have access to 'machine' here.
//if release_tmp_xmm { self.machine.release_temp_xmm(tmp_xmm) }
},
),
Operator::F32Eq => Self::emit_fp_cmpop_avx(