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Rewrite cpu_translator::avg()

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This commit is contained in:
Nekotekina 2018-06-27 15:44:06 +03:00
parent 8ad05ce10e
commit c86dc133cf
1 changed files with 24 additions and 7 deletions
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31
rpcs3/Emu/CPU/CPUTranslator.h
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@ -991,13 +991,6 @@ public:
return (a & c) | (b & ~c); return (a & c) | (b & ~c);
} }
// Average: (a + b + 1) >> 1
template <typename T>
static inline auto avg(T a, T b)
{
return (a >> 1) + (b >> 1) + ((a | b) & 1);
}
// Rotate left // Rotate left
template <typename T> template <typename T>
static inline auto rol(T a, T b) static inline auto rol(T a, T b)
@ -1014,6 +1007,30 @@ public:
return a << (b & mask) | a >> ((0 - b) & mask); return a << (b & mask) | a >> ((0 - b) & mask);
} }
// Average: (a + b + 1) >> 1
template <typename T>
inline auto avg(T a, T b)
{
//return (a >> 1) + (b >> 1) + ((a | b) & 1);
value_t<typename T::type> result;
llvm::Instruction::CastOps cast_op = llvm::Instruction::BitCast;
if (result.is_sint)
cast_op = llvm::Instruction::SExt;
if (result.is_uint)
cast_op = llvm::Instruction::ZExt;
llvm::Type* cast_t = m_ir->getIntNTy(result.esize * 2);
if (result.is_vector != 0)
cast_t = llvm::VectorType::get(cast_t, result.is_vector);
const auto axt = m_ir->CreateCast(cast_op, a.eval(m_ir), cast_t);
const auto bxt = m_ir->CreateCast(cast_op, b.eval(m_ir), cast_t);
const auto cxt = llvm::ConstantInt::get(cast_t, 1, false);
const auto abc = m_ir->CreateAdd(m_ir->CreateAdd(axt, bxt), cxt);
result.value = m_ir->CreateTrunc(m_ir->CreateLShr(abc, 1), result.get_type(m_context));
return result;
}
// Select (c ? a : b) // Select (c ? a : b)
template <typename T, typename T2> template <typename T, typename T2>
auto select(T2 c, T a, T b) auto select(T2 c, T a, T b)