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IR: Generalise SignedSaturated{Add,Sub} to support more bitwidths

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This commit is contained in:
MerryMage 2018-07-30 10:59:52 +01:00
parent 71db0e67ae
commit 10e196480f
4 changed files with 119 additions and 43 deletions
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40
src/frontend/ir/ir_emitter.cpp
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@ -481,15 +481,43 @@ U32U64 IREmitter::MinUnsigned(const U32U64& a, const U32U64& b) {
return Inst<U64>(Opcode::MinUnsigned64, a, b);
}
ResultAndOverflow<U32> IREmitter::SignedSaturatedAdd(const U32& a, const U32& b) {
auto result = Inst<U32>(Opcode::SignedSaturatedAdd, a, b);
auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
ResultAndOverflow<UAny> IREmitter::SignedSaturatedAdd(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::SignedSaturatedAdd8, a, b);
case IR::Type::U16:
return Inst<U16>(Opcode::SignedSaturatedAdd16, a, b);
case IR::Type::U32:
return Inst<U32>(Opcode::SignedSaturatedAdd32, a, b);
case IR::Type::U64:
return Inst<U64>(Opcode::SignedSaturatedAdd64, a, b);
default:
return IR::UAny{};
}
}();
const auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
return {result, overflow};
}
ResultAndOverflow<U32> IREmitter::SignedSaturatedSub(const U32& a, const U32& b) {
auto result = Inst<U32>(Opcode::SignedSaturatedSub, a, b);
auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
ResultAndOverflow<UAny> IREmitter::SignedSaturatedSub(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::SignedSaturatedSub8, a, b);
case IR::Type::U16:
return Inst<U16>(Opcode::SignedSaturatedSub16, a, b);
case IR::Type::U32:
return Inst<U32>(Opcode::SignedSaturatedSub32, a, b);
case IR::Type::U64:
return Inst<U64>(Opcode::SignedSaturatedSub64, a, b);
default:
return IR::UAny{};
}
}();
const auto overflow = Inst<U1>(Opcode::GetOverflowFromOp, result);
return {result, overflow};
}