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SPU LLVM: optimize SHUFB for permutation-only shuffles 

Drop constant generation when unused.
This commit is contained in:
Nekotekina 2021-09-01 19:49:27 +03:00
parent 144244e902
commit 2acb6ed60d
1 changed files with 37 additions and 9 deletions
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46
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -7589,6 +7589,9 @@ public:
return;
}
// (TODO: implement via known-bits-lookup) Check whether shuffle mask doesn't contain fixed value selectors
const auto [perm_only, dummy1] = match_expr(c, match<u8[16]>() & 31);
const auto a = get_vr<u8[16]>(op.ra);
const auto b = get_vr<u8[16]>(op.rb);
@ -7598,9 +7601,14 @@ public:
if (auto [ok, bs] = match_expr(b, byteswap(match<u8[16]>())); ok)
{
// Undo endian swapping, and rely on pshufb/vperm2b to re-reverse endianness
if (m_use_avx512_icl && (op.ra != op.rb))
{
if (perm_only)
{
set_vr(op.rt4, vperm2b(as, bs, c));
return;
}
const auto m = gf2p8affineqb(c, build<u8[16]>(0x40, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x40, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20), 0x7f);
const auto mm = select(noncast<s8[16]>(m) >= 0, splat<u8[16]>(0), m);
const auto ab = vperm2b(as, bs, c);
@ -7611,19 +7619,26 @@ public:
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);
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, bx) | x);
if (perm_only)
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, bx));
else
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, bx) | x);
return;
}
if (auto [ok, data] = get_const_vector(b.value, m_pos); ok)
{
const bool all_bytes_equiv = data == v128::from8p(data._u8[0]);
if (all_bytes_equiv)
if (data == v128::from8p(data._u8[0]))
{
// 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 ax = pshufb(as, c);
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, b) | x);
if (perm_only)
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, b));
else
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, ax, b) | x);
return;
}
}
@ -7633,13 +7648,16 @@ public:
{
if (auto [ok, data] = get_const_vector(a.value, m_pos); ok)
{
const bool all_bytes_equiv = data == v128::from8p(data._u8[0]);
if (all_bytes_equiv)
if (data == v128::from8p(data._u8[0]))
{
// 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 bx = pshufb(bs, c);
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, a, bx) | x);
if (perm_only)
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, a, bx));
else
set_vr(op.rt4, select(noncast<s8[16]>(c << 3) >= 0, a, bx) | x);
return;
}
}
@ -7647,6 +7665,12 @@ public:
if (m_use_avx512_icl && (op.ra != op.rb || m_interp_magn))
{
if (perm_only)
{
set_vr(op.rt4, vperm2b(b, a, eval(~c)));
return;
}
const auto m = gf2p8affineqb(c, build<u8[16]>(0x40, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x40, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20), 0x7f);
const auto mm = select(noncast<s8[16]>(m) >= 0, splat<u8[16]>(0), m);
const auto cr = eval(~c);
@ -7659,7 +7683,11 @@ public:
const auto cr = eval(c ^ 0xf);
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);
if (perm_only)
set_vr(op.rt4, select(noncast<s8[16]>(cr << 3) >= 0, ax, bx));
else
set_vr(op.rt4, select(noncast<s8[16]>(cr << 3) >= 0, ax, bx) | x);
}
void MPYA(spu_opcode_t op)