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SPU LLVM: Improve byteswap elimination

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- Use the data before it has been swapped rather than relying on a second byteswap to cancel out the first
This commit is contained in:
Malcolm Jestadt 2021-04-20 15:09:51 -04:00 • committed by Ivan
parent 551472220e
commit efd38fa940
1 changed files with 5 additions and 13 deletions
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18
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -6562,9 +6562,8 @@ public:
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)
if (auto [ok, as] = 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 + (splat_scalar(get_vr<u8[16]>(op.rb)) >> 3);
@ -6705,9 +6704,8 @@ public:
}
// Data with swapped endian from a load instruction
if (auto [ok, v0] = match_expr(a, byteswap(match<u8[16]>())); ok)
if (auto [ok, as] = 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 + splat_scalar(b));
@ -7416,14 +7414,10 @@ public:
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, as] = match_expr(a, byteswap(match<u8[16]>())); ok)
{
if (auto [ok, v1] = match_expr(b, byteswap(match<u8[16]>())); ok)
if (auto [ok, bs] = match_expr(b, byteswap(match<u8[16]>())); ok)
{
// Undo endian swapping, and rely on pshufb/vperm2b to re-reverse endianness
const auto as = byteswap(a);
const auto bs = byteswap(b);
const auto x = avg(noncast<u8[16]>(sext<s8[16]>((c & 0xc0) == 0xc0)), noncast<u8[16]>(sext<s8[16]>((c & 0xe0) == 0xc0)));
const auto ax = pshufb(as, c);
const auto bx = pshufb(bs, c);
@ -7438,7 +7432,6 @@ public:
{
// 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;
@ -7446,7 +7439,7 @@ public:
}
}
if (auto [ok, v0] = match_expr(b, byteswap(match<u8[16]>())); ok)
if (auto [ok, bs] = match_expr(b, byteswap(match<u8[16]>())); ok)
{
if (auto [ok, data] = get_const_vector(a.value, m_pos, 7000); ok)
{
@ -7455,7 +7448,6 @@ public:
{
// 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;