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util/types.hpp: Rewrite narrow<>

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This commit is contained in:
Elad 2024-11-27 11:35:23 +02:00
parent fce07bbeab
commit 191e132c6c
2 changed files with 26 additions and 78 deletions
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6
rpcs3/Emu/RSX/RSXThread.cpp
View File

@ -493,7 +493,7 @@ namespace rsx
default:
break;
}
fmt::throw_exception("RSXVertexData::GetTypeSize: Bad vertex data type (%d)!", static_cast<u8>(type));
fmt::throw_exception("Bad vertex data type (%d)!", static_cast<u8>(type));
}
void tiled_region::write(const void *src, u32 width, u32 height, u32 pitch)
@ -552,7 +552,7 @@ namespace rsx
}
break;
default:
::narrow(tile->comp);
fmt::throw_exception("Bad tile compression type (%d)!", tile->comp);
}
}
@ -603,7 +603,7 @@ namespace rsx
}
break;
default:
::narrow(tile->comp);
fmt::throw_exception("Bad tile compression type (%d)!", tile->comp);
}
}

98
rpcs3/util/types.hpp
View File

@ -976,85 +976,33 @@ constexpr decltype(auto) ensure(T&& arg, F&& pred, const_str msg = const_str(),
fmt::raw_verify_error(src_loc, msg, 0);
}
// narrow() function details
template <typename From, typename To = void, typename = void>
struct narrow_impl
{
// Temporarily (diagnostic)
static_assert(std::is_void_v<To>, "narrow_impl<> specialization not found");
// Returns true if value cannot be represented in type To
static constexpr bool test(const From&)
{
// Unspecialized cases (including cast to void) always considered narrowing
return true;
}
};
// Unsigned to unsigned narrowing
template <typename From, typename To>
struct narrow_impl<From, To, std::enable_if_t<std::is_unsigned_v<From> && std::is_unsigned_v<To>>>
{
static constexpr bool test(const From& value)
{
return sizeof(To) < sizeof(From) && static_cast<To>(value) != value;
}
};
// Signed to signed narrowing
template <typename From, typename To>
struct narrow_impl<From, To, std::enable_if_t<std::is_signed_v<From> && std::is_signed_v<To>>>
{
static constexpr bool test(const From& value)
{
return sizeof(To) < sizeof(From) && static_cast<To>(value) != value;
}
};
// Unsigned to signed narrowing
template <typename From, typename To>
struct narrow_impl<From, To, std::enable_if_t<std::is_unsigned_v<From> && std::is_signed_v<To>>>
{
static constexpr bool test(const From& value)
{
return sizeof(To) <= sizeof(From) && value > (static_cast<std::make_unsigned_t<To>>(-1) >> 1);
}
};
// Signed to unsigned narrowing (I)
template <typename From, typename To>
struct narrow_impl<From, To, std::enable_if_t<std::is_signed_v<From> && std::is_unsigned_v<To> && sizeof(To) >= sizeof(From)>>
{
static constexpr bool test(const From& value)
{
return value < static_cast<From>(0);
}
};
// Signed to unsigned narrowing (II)
template <typename From, typename To>
struct narrow_impl<From, To, std::enable_if_t<std::is_signed_v<From> && std::is_unsigned_v<To> && sizeof(To) < sizeof(From)>>
{
static constexpr bool test(const From& value)
{
return static_cast<std::make_unsigned_t<From>>(value) > static_cast<To>(-1);
}
};
// Simple type enabled (TODO: allow for To as well)
template <typename From, typename To>
struct narrow_impl<From, To, std::enable_if_t<!std::is_same_v<std::common_type_t<From>, From>>>
: narrow_impl<std::common_type_t<From>, To>
{
};
template <typename To = void, typename From, typename = decltype(static_cast<To>(std::declval<From>()))>
template <typename To, typename From> requires (std::is_integral_v<decltype(std::declval<To>() + std::declval<From>())>)
[[nodiscard]] constexpr To narrow(const From& value, std::source_location src_loc = std::source_location::current())
{
// Narrow check
if (narrow_impl<From, To>::test(value)) [[unlikely]]
using CommonFrom = std::common_type_t<From>;
using CommonTo = std::common_type_t<To>;
using UnFrom = std::make_unsigned_t<CommonFrom>;
using UnTo = std::make_unsigned_t<CommonTo>;
constexpr bool is_from_signed = std::is_signed_v<CommonFrom>;
constexpr bool is_to_signed = std::is_signed_v<CommonTo>;
constexpr auto from_mask = is_from_signed > is_to_signed ? UnFrom{umax} >> 1 : UnFrom{umax};
constexpr auto to_mask = is_to_signed > is_from_signed ? UnTo{umax} >> 1 : UnTo{umax};
constexpr auto mask = ~(from_mask & to_mask);
// Signed to unsigned always require test
// Otherwise, this is bit-wise narrowing or conversion between types of different signedness of the same size
if constexpr (is_from_signed > is_to_signed || to_mask < from_mask)
{
fmt::raw_verify_error(src_loc, u8"Narrowing error", +value);
// Try to optimize test if both are of the same signedness
if (is_from_signed != is_to_signed ? !!(value & mask) : static_cast<CommonTo>(value) != value) [[unlikely]]
{
fmt::raw_verify_error(src_loc, u8"Narrowing error", +value);
}
}
return static_cast<To>(value);