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SPU LLVM: Small FCGT optimization
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This commit is contained in:
Malcolm Jestadt 2024-12-15 13:05:28 -05:00 • committed by Elad
parent 86a832da29
commit bd49c6bedb
1 changed files with 14 additions and 11 deletions
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25
rpcs3/Emu/Cell/SPULLVMRecompiler.cpp
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@ -6234,14 +6234,14 @@ public:
const value_t<f32[4]> ab[2]{a, b};
std::bitset<2> safe_int_compare(0);
std::bitset<2> safe_nonzero_compare(0);
std::bitset<2> safe_finite_compare(0);
for (u32 i = 0; i < 2; i++)
{
if (auto [ok, data] = get_const_vector(ab[i].value, m_pos, __LINE__ + i); ok)
{
safe_int_compare.set(i);
safe_nonzero_compare.set(i);
safe_finite_compare.set(i);
for (u32 j = 0; j < 4; j++)
{
@ -6256,7 +6256,7 @@ public:
// we don't produce "extended range" values the same way as real hardware, it's not safe to apply
// this optimization for values outside of the range of x86 floating point hardware.
safe_int_compare.reset(i);
if (!exponent) safe_nonzero_compare.reset(i);
if ((value & 0x7fffffffu) >= 0x7f7ffffeu) safe_finite_compare.reset(i);
}
}
}
@ -6267,17 +6267,20 @@ public:
return eval(sext<s32[4]>(bitcast<s32[4]>(a) > bitcast<s32[4]>(b)));
}
if (safe_finite_compare.test(1))
{
return eval(sext<s32[4]>(fcmp_uno(clamp_negative_smax(a) > b)));
}
if (safe_finite_compare.test(0))
{
return eval(sext<s32[4]>(fcmp_ord(a > clamp_smax(b))));
}
const auto ai = eval(bitcast<s32[4]>(a));
const auto bi = eval(bitcast<s32[4]>(b));
if (!safe_nonzero_compare.any())
{
return eval(sext<s32[4]>(fcmp_uno(a != b) & select((ai & bi) >= 0, ai > bi, ai < bi)));
}
else
{
return eval(sext<s32[4]>(select((ai & bi) >= 0, ai > bi, ai < bi)));
}
return eval(sext<s32[4]>(fcmp_uno(a != b) & select((ai & bi) >= 0, ai > bi, ai < bi)));
});
set_vr(op.rt, fcgt(get_vr<f32[4]>(op.ra), get_vr<f32[4]>(op.rb)));