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Dynamic sqrt pattern

This commit is contained in:
RipleyTom 2024-02-17 06:25:02 +01:00
parent ef5cffdead
commit 54ce1343cf
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GPG Key ID: FC2B5DEF76BF4CC8
1 changed files with 22 additions and 14 deletions
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36
rpcs3/Emu/Cell/SPULLVMRecompiler.cpp
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@ -6027,12 +6027,12 @@ public:
static const auto MT = match<f32[4]>();
const auto full_expr = fma(a, b, c);
auto check_sqrt_pattern_for_float = [&](f32 float_value) -> bool
// eval_sqrt = x * spu_resqrt(x)
// eval_sqrt + (1 - (spu_resqrt(x) * eval_sqrt)) * (0.5 * eval_sqrt)
// FMA(FNMS(spu_resqrt(x) <*> eval_sqrt, float_value) <*> FM(0.5f, eval_sqrt), eval_sqrt)
if (auto [ok_fm_c, x, maybe_x] = match_expr(c, fm(MT, spu_rsqrte(MT))); ok_fm_c && x.eq(maybe_x))
{
// eval_sqrt = x * spu_resqrt(x)
// eval_sqrt + (1 - (spu_resqrt(x) * eval_sqrt)) * (0.5 * eval_sqrt)
// FMA(FNMS(spu_resqrt(x) <*> eval_sqrt, float_value) <*> FM(0.5f, eval_sqrt), eval_sqrt)
if (auto [ok_fm_c, x, maybe_x] = match_expr(c, fm(MT, spu_rsqrte(MT))); ok_fm_c && x.eq(maybe_x))
auto check_sqrt_pattern_for_float = [&](f32 float_value) -> bool
{
if (auto [ok_fma] = match_expr(full_expr, fma(fnms(spu_rsqrte(x), c, fsplat<f32[4]>(float_value)), fm(fsplat<f32[4]>(0.5f), c), c)); ok_fma)
{
@ -6042,16 +6042,24 @@ public:
set_vr(op.rt4, fsqrt(fabs(x)));
return true;
}
return false;
};
if (check_sqrt_pattern_for_float(1.0f))
return;
if (check_sqrt_pattern_for_float(ONEISH))
return;
// Generate dynamic pattern for when float is unknown because of scope
if (auto [ok_fma, cursed_float] = match_expr(full_expr, fma(fnms(spu_rsqrte(x), c, MT), fm(fsplat<f32[4]>(0.5f), c), c)); ok_fma)
{
erase_stores(a, b, c);
const auto bitcast_float = bitcast<u32[4]>(cursed_float);
set_vr(op.rt4, select(bitcast_float == splat<u32[4]>(0x3F800000) | bitcast_float == splat<u32[4]>(0x3F800001), fsqrt(fabs(x)), fma(fnms(spu_rsqrte(x), c, cursed_float), fm(fsplat<f32[4]>(0.5f), fm(x, spu_rsqrte(x))), fm(x, spu_rsqrte(x)))));
return;
}
return false;
};
if (check_sqrt_pattern_for_float(1.0f))
return;
if (check_sqrt_pattern_for_float(ONEISH))
return;
}
// Full reciprocal patterns
// FMA(FNMS(div <*> spu_re(div), float_value) <*> spu_re(div), spu_re(div))