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SPU LLVM: Avoid additional endian swapping

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- Avoid additional endian swapping with the ROTQBY and ROTQBYBI instructions
- ROTQBYI is left out intentionally, since it caused worse codegen
This commit is contained in:
Malcolm Jestadt 2020-07-12 18:21:23 -04:00 committed by Ani
parent 824be77bba
commit a9d0ffcac1
1 changed files with 53 additions and 9 deletions
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62
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -6435,11 +6435,29 @@ public:
set_vr(op.rt, sext<s8[16]>(m));
}
template <typename TA>
static auto byteswap(TA&& a)
{
return zshuffle(std::forward<TA>(a), 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
}
void ROTQBYBI(spu_opcode_t op)
{
const auto a = get_vr<u8[16]>(op.ra);
// Data with swapped endian from a load instruction
if (auto [ok, v0] = match_expr(a, byteswap(match<u8[16]>())); ok)
{
const auto as = byteswap(a);
const auto sc = build<u8[16]>(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
const auto sh = (sc + (zshuffle(get_vr<u8[16]>(op.rb), 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12) >> 3)) & 0xf;
set_vr(op.rt, pshufb(as, sh));
return;
}
const auto sc = build<u8[16]>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
const auto sh = (sc - (zshuffle(get_vr<u8[16]>(op.rb), 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12) >> 3)) & 0xf;
set_vr(op.rt, pshufb(get_vr<u8[16]>(op.ra), sh));
set_vr(op.rt, pshufb(a, sh));
}
void ROTQMBYBI(spu_opcode_t op)
@ -6557,6 +6575,16 @@ public:
return;
}
// Data with swapped endian from a load instruction
if (auto [ok, v0] = match_expr(a, byteswap(match<u8[16]>())); ok)
{
const auto as = byteswap(a);
const auto sc = build<u8[16]>(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
const auto sh = eval((sc + zshuffle(b, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12)) & 0xf);
set_vr(op.rt, pshufb(as, sh));
return;
}
const auto sc = build<u8[16]>(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
const auto sh = eval((sc - zshuffle(b, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12)) & 0xf);
set_vr(op.rt, pshufb(a, sh));
@ -7143,12 +7171,6 @@ public:
set_vr(op.rt4, (get_vr(op.rb) & c) | (get_vr(op.ra) & ~c));
}
template <typename TA>
static auto byteswap(TA&& a)
{
return zshuffle(std::forward<TA>(a), 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
}
void SHUFB(spu_opcode_t op) //
{
if (match_vr<u8[16], u16[8], u32[4], u64[2]>(op.rc, [&](auto c, auto MP)
@ -7273,7 +7295,18 @@ public:
{
v128 data = get_const_vector(ci, m_pos, 7000);
if (data == v128{})
bool all_bytes_equiv = true;
for (u32 i = 0; i < 16; i++)
{
if (data._u8[0] != data._u8[i])
{
all_bytes_equiv = false;
break;
}
}
if (all_bytes_equiv)
{
// See above
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));
@ -7291,7 +7324,18 @@ public:
{
v128 data = get_const_vector(ci, m_pos, 7000);
if (data == v128{})
bool all_bytes_equiv = true;
for (u32 i = 0; i < 16; i++)
{
if (data._u8[0] != data._u8[i])
{
all_bytes_equiv = false;
break;
}
}
if (all_bytes_equiv)
{
// See above
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));