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SPU LLVM: improve MPYH instruction

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Rewritten to use 16-bit multiplication, as in SPU ASMJIT.
This commit is contained in:
Nekotekina 2021-05-13 23:14:27 +03:00
parent cdf25d902a
commit 6dca588370
1 changed files with 4 additions and 4 deletions
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8
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -6255,19 +6255,19 @@ public:
}
template <typename TA, typename TB>
static auto mpyh(TA&& a, TB&& b)
auto mpyh(TA&& a, TB&& b)
{
return (std::forward<TA>(a) >> 16) * (std::forward<TB>(b) << 16);
return bitcast<u32[4]>(bitcast<u16[8]>((std::forward<TA>(a) >> 16)) * bitcast<u16[8]>(std::forward<TB>(b))) << 16;
}
template <typename TA, typename TB>
static auto mpyu(TA&& a, TB&& b)
auto mpyu(TA&& a, TB&& b)
{
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)
auto fm(TA&& a, TB&& b)
{
return (std::forward<TA>(a)) * (std::forward<TB>(b));
}