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emit_x64_vector: Changes to VectorSignedSaturatedDoublingMultiply

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* Return both the upper and lower parts of the multiply if required
* SSE2 does not support the pmuldq instruction, do sign correction to an unsigned result instead
* Improve port utilisation where possible (punpck instructions were a bottleneck)
This commit is contained in:
MerryMage
2018-09-15 09:04:19 +01:00
parent 08c0e017a5
commit 06b31448aa
8 changed files with 233 additions and 70 deletions
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26
src/frontend/ir/ir_emitter.cpp
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@@ -1575,15 +1575,23 @@ U128 IREmitter::VectorSignedSaturatedAccumulateUnsigned(size_t esize, const U128
return {};
}
U128 IREmitter::VectorSignedSaturatedDoublingMultiplyReturnHigh(size_t esize, const U128& a, const U128& b) {
switch (esize) {
case 16:
return Inst<U128>(Opcode::VectorSignedSaturatedDoublingMultiplyReturnHigh16, a, b);
case 32:
return Inst<U128>(Opcode::VectorSignedSaturatedDoublingMultiplyReturnHigh32, a, b);
}
UNREACHABLE();
return {};
UpperAndLower IREmitter::VectorSignedSaturatedDoublingMultiply(size_t esize, const U128& a, const U128& b) {
const Value multiply = [&] {
switch (esize) {
case 16:
return Inst(Opcode::VectorSignedSaturatedDoublingMultiply16, a, b);
case 32:
return Inst(Opcode::VectorSignedSaturatedDoublingMultiply32, a, b);
default:
UNREACHABLE();
return Value{};
}
}();
return {
Inst<U128>(Opcode::GetUpperFromOp, multiply),
Inst<U128>(Opcode::GetLowerFromOp, multiply),
};
}
U128 IREmitter::VectorSignedSaturatedNarrowToSigned(size_t original_esize, const U128& a) {