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SPU LLVM: Avoid redundant endian swapping

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- PSHUFB operates in reverse byte order from SHUFB, so we can take advantage of that to swap endianness without additional transformations in some situations
This commit is contained in:
Malcolm Jestadt 2020-06-30 11:33:22 -04:00 committed by Ani
parent 74c8a44d84
commit 824be77bba
1 changed files with 63 additions and 5 deletions
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68
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -7143,6 +7143,12 @@ 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)
@ -7245,11 +7251,63 @@ public:
spu_log.todo("[0x%x] Const SHUFB mask: %s", m_pos, mask);
}
const auto a = get_vr<u8[16]>(op.ra);
const auto b = get_vr<u8[16]>(op.rb);
// Data with swapped endian from a load instruction
if (auto [ok, v0] = match_expr(a, byteswap(match<u8[16]>())); ok)
{
if (auto [ok, v1] = match_expr(b, byteswap(match<u8[16]>())); ok)
{
// Undo endian swapping, and rely on pshufb to re-reverse endianness
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));
const auto as = byteswap(a);
const auto bs = byteswap(b);
const auto ax = pshufb(as, c);
const auto bx = pshufb(bs, c);
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, bx) | x);
return;
}
if (auto ci = llvm::dyn_cast<llvm::Constant>(b.value))
{
v128 data = get_const_vector(ci, m_pos, 7000);
if (data == v128{})
{
// See above
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));
const auto as = byteswap(a);
const auto ax = pshufb(as, c);
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, b) | x);
return;
}
}
}
if (auto [ok, v0] = match_expr(b, byteswap(match<u8[16]>())); ok)
{
if (auto ci = llvm::dyn_cast<llvm::Constant>(a.value))
{
v128 data = get_const_vector(ci, m_pos, 7000);
if (data == v128{})
{
// See above
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));
const auto bs = byteswap(b);
const auto bx = pshufb(bs, c);
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, a, bx) | x);
return;
}
}
}
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));
const auto cr = eval(c ^ 0xf);
const auto a = pshufb(get_vr<u8[16]>(op.ra), cr);
const auto b = pshufb(get_vr<u8[16]>(op.rb), cr);
set_vr(op.rt4, select(noncast<s8[16]>(cr << 3) >= 0, a, b) | x);
const auto ax = pshufb(a, cr);
const auto bx = pshufb(b, cr);
set_vr(op.rt4, select(noncast<s8[16]>(cr << 3) >= 0, ax, bx) | x);
}
void MPYA(spu_opcode_t op)
@ -7990,7 +8048,7 @@ public:
void make_store_ls(value_t<u64> addr, value_t<u8[16]> data)
{
const auto bswapped = zshuffle(data, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
const auto bswapped = byteswap(data);
m_ir->CreateStore(bswapped.eval(m_ir), m_ir->CreateBitCast(m_ir->CreateGEP(m_lsptr, addr.value), get_type<u8(*)[16]>()), true);
}
@ -7998,7 +8056,7 @@ public:
{
value_t<u8[16]> data;
data.value = m_ir->CreateLoad(m_ir->CreateBitCast(m_ir->CreateGEP(m_lsptr, addr.value), get_type<u8(*)[16]>()), true);
return zshuffle(data, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
return byteswap(data);
}
void STQX(spu_opcode_t op)