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ir: Add opcodes for unsigned saturating add and subtract

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Lioncash 2018-08-13 11:45:35 -04:00 • committed by MerryMage
parent c41b5a3492
commit acbaf04fef
4 changed files with 158 additions and 37 deletions
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52
src/frontend/ir/ir_emitter.cpp
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@ -521,16 +521,56 @@ ResultAndOverflow<UAny> IREmitter::SignedSaturatedSub(const UAny& a, const UAny&
return {result, overflow};
}
ResultAndOverflow<U32> IREmitter::UnsignedSaturation(const U32& a, size_t bit_size_to_saturate_to) {
ASSERT(bit_size_to_saturate_to <= 31);
auto result = Inst<U32>(Opcode::UnsignedSaturation, a, Imm8(static_cast<u8>(bit_size_to_saturate_to)));
ResultAndOverflow<U32> IREmitter::SignedSaturation(const U32& a, size_t bit_size_to_saturate_to) {
ASSERT(bit_size_to_saturate_to >= 1 && bit_size_to_saturate_to <= 32);
auto result = Inst<U32>(Opcode::SignedSaturation, a, Imm8(static_cast<u8>(bit_size_to_saturate_to)));
auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
return {result, overflow};
}
ResultAndOverflow<U32> IREmitter::SignedSaturation(const U32& a, size_t bit_size_to_saturate_to) {
ASSERT(bit_size_to_saturate_to >= 1 && bit_size_to_saturate_to <= 32);
auto result = Inst<U32>(Opcode::SignedSaturation, a, Imm8(static_cast<u8>(bit_size_to_saturate_to)));
ResultAndOverflow<UAny> IREmitter::UnsignedSaturatedAdd(const UAny& a, const UAny& b) {
ASSERT(a.GetType() == b.GetType());
const auto result = [&]() -> IR::UAny {
switch (a.GetType()) {
case IR::Type::U8:
return Inst<U8>(Opcode::UnsignedSaturatedAdd8, a, b);
case IR::Type::U16:
return Inst<U16>(Opcode::UnsignedSaturatedAdd16, a, b);
case IR::Type::U32:
return Inst<U32>(Opcode::UnsignedSaturatedAdd32, a, b);
case IR::Type::U64:
return Inst<U64>(Opcode::UnsignedSaturatedAdd64, a, b);
default:
return IR::UAny{};
}
}();
const auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
return {result, overflow};
}
ResultAndOverflow<UAny> IREmitter::UnsignedSaturatedSub(const UAny& a, const UAny& b) {
ASSERT(a.GetType() == b.GetType());
const auto result = [&]() -> IR::UAny {
switch (a.GetType()) {
case IR::Type::U8:
return Inst<U8>(Opcode::UnsignedSaturatedSub8, a, b);
case IR::Type::U16:
return Inst<U16>(Opcode::UnsignedSaturatedSub16, a, b);
case IR::Type::U32:
return Inst<U32>(Opcode::UnsignedSaturatedSub32, a, b);
case IR::Type::U64:
return Inst<U64>(Opcode::UnsignedSaturatedSub64, a, b);
default:
return IR::UAny{};
}
}();
const auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
return {result, overflow};
}
ResultAndOverflow<U32> IREmitter::UnsignedSaturation(const U32& a, size_t bit_size_to_saturate_to) {
ASSERT(bit_size_to_saturate_to <= 31);
auto result = Inst<U32>(Opcode::UnsignedSaturation, a, Imm8(static_cast<u8>(bit_size_to_saturate_to)));
auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
return {result, overflow};
}