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LLVM DSL: implement fpcast

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This commit is contained in:
Nekotekina 2021-09-01 21:07:02 +03:00
parent 1685769bd9
commit 7ec7f261b1
1 changed files with 55 additions and 0 deletions
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55
rpcs3/Emu/CPU/CPUTranslator.h
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@ -1751,6 +1751,55 @@ struct llvm_bitcast
}
};
template <typename U, typename A1, typename T = llvm_common_t<A1>>
struct llvm_fpcast
{
using type = U;
static constexpr auto opc =
llvm_value_t<T>::is_sint ? llvm::Instruction::SIToFP :
llvm_value_t<U>::is_sint ? llvm::Instruction::FPToSI :
llvm_value_t<T>::is_int ? llvm::Instruction::UIToFP :
llvm_value_t<U>::is_int ? llvm::Instruction::FPToUI :
llvm_value_t<T>::esize > llvm_value_t<U>::esize ? llvm::Instruction::FPTrunc :
llvm_value_t<T>::esize < llvm_value_t<U>::esize ? llvm::Instruction::FPExt : llvm::Instruction::BitCast;
llvm_expr_t<A1> a1;
static_assert(llvm_value_t<T>::is_float || llvm_value_t<U>::is_float, "llvm_fpcast<>: invalid type(s)");
static_assert(opc != llvm::Instruction::BitCast, "llvm_fpcast<>: possible cast to the same type");
static_assert(llvm_value_t<T>::is_vector == llvm_value_t<U>::is_vector, "llvm_fpcast<>: vector element mismatch");
static constexpr bool is_ok =
(llvm_value_t<T>::is_float || llvm_value_t<U>::is_float) && opc != llvm::Instruction::BitCast &&
llvm_value_t<T>::is_vector == llvm_value_t<U>::is_vector;
llvm::Value* eval(llvm::IRBuilder<>* ir) const
{
return ir->CreateCast(opc, a1.eval(ir), llvm_value_t<U>::get_type(ir->getContext()));
}
llvm_match_tuple<A1> match(llvm::Value*& value) const
{
llvm::Value* v1 = {};
if (auto i = llvm::dyn_cast_or_null<llvm::CastInst>(value); i && i->getOpcode() == opc)
{
v1 = i->getOperand(0);
if (llvm_value_t<U>::get_type(v1->getContext()) == i->getDestTy())
{
if (auto r1 = a1.match(v1); v1)
{
return r1;
}
}
}
value = nullptr;
return {};
}
};
template <typename U, typename A1, typename T = llvm_common_t<A1>>
struct llvm_trunc
{
@ -2890,6 +2939,12 @@ public:
return llvm_bitcast<U, T>{std::forward<T>(expr), m_module};
}
template <typename U, typename T, typename = std::enable_if_t<llvm_fpcast<U, T>::is_ok>>
static auto fpcast(T&& expr)
{
return llvm_fpcast<U, T>{std::forward<T>(expr)};
}
template <typename U, typename T, typename = std::enable_if_t<llvm_trunc<U, T>::is_ok>>
static auto trunc(T&& expr)
{