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SPU LLVM: Avoid negative clamping when the input is known to be positive

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This commit is contained in:
Malcolm Jestadt 2020-07-03 23:49:30 -04:00 committed by Ivan
parent af1ceb1151
commit 6cc0fe4221
1 changed files with 26 additions and 2 deletions
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28
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -6166,6 +6166,12 @@ public:
return (std::forward<TA>(a) << 16 >> 16) * (std::forward<TB>(b) << 16 >> 16);
}
template <typename TA, typename TB>
static auto fm(TA&& a, TB&& b)
{
return (std::forward<TA>(a)) * (std::forward<TB>(b));
}
void SF(spu_opcode_t op)
{
set_vr(op.rt, get_vr(op.rb) - get_vr(op.ra));
@ -7280,6 +7286,19 @@ public:
set_vr(op.rt, -(a * b + c));
}
bool is_input_positive(value_t<f32[4]> a)
{
if (auto [ok, v0, v1] = match_expr(a, fm(match<f32[4]>(), match<f32[4]>())); ok)
{
if (v0.value == v1.value)
{
return true;
}
}
return false;
}
// clamping helpers
value_t<f32[4]> clamp_positive_smax(value_t<f32[4]> v)
{
@ -7288,6 +7307,11 @@ public:
value_t<f32[4]> clamp_negative_smax(value_t<f32[4]> v)
{
if (is_input_positive(v))
{
return v;
}
return eval(bitcast<f32[4]>(min(bitcast<u32[4]>(v),splat<u32[4]>(0xff7fffff))));
}
@ -7474,7 +7498,7 @@ public:
if (op.ra == op.rb && !m_interp_magn)
{
set_vr(op.rt, a * b);
set_vr(op.rt, fm(a, b));
return;
}
@ -7482,7 +7506,7 @@ public:
const auto mb = eval(sext<s32[4]>(fcmp_uno(b != fsplat<f32[4]>(0.))));
const auto ca = eval(bitcast<f32[4]>(bitcast<s32[4]>(a) & mb));
const auto cb = eval(bitcast<f32[4]>(bitcast<s32[4]>(b) & ma));
set_vr(op.rt, ca * cb);
set_vr(op.rt, fm(ca, cb));
}
else
set_vr(op.rt, get_vr<f32[4]>(op.ra) * get_vr<f32[4]>(op.rb));