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common: Make use of [[nodiscard]] where applicable

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Now that clang-format makes [[nodiscard]] attributes format sensibly, we
can apply them to several functions within the common library to allow
the compiler to complain about any misuses of the functions.
This commit is contained in:
Lioncash 2020-08-14 09:38:45 -04:00
parent 2b601e8636
commit df72480395
34 changed files with 343 additions and 358 deletions
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34
src/common/bit_util.h
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@ -17,12 +17,12 @@ namespace Common {
/// Gets the size of a specified type T in bits.
template <typename T>
constexpr std::size_t BitSize() {
[[nodiscard]] constexpr std::size_t BitSize() {
return sizeof(T) * CHAR_BIT;
}
#ifdef _MSC_VER
inline u32 CountLeadingZeroes32(u32 value) {
[[nodiscard]] inline u32 CountLeadingZeroes32(u32 value) {
unsigned long leading_zero = 0;
if (_BitScanReverse(&leading_zero, value) != 0) {
@ -32,7 +32,7 @@ inline u32 CountLeadingZeroes32(u32 value) {
return 32;
}
inline u32 CountLeadingZeroes64(u64 value) {
[[nodiscard]] inline u32 CountLeadingZeroes64(u64 value) {
unsigned long leading_zero = 0;
if (_BitScanReverse64(&leading_zero, value) != 0) {
@ -42,7 +42,7 @@ inline u32 CountLeadingZeroes64(u64 value) {
return 64;
}
#else
inline u32 CountLeadingZeroes32(u32 value) {
[[nodiscard]] inline u32 CountLeadingZeroes32(u32 value) {
if (value == 0) {
return 32;
}
@ -50,7 +50,7 @@ inline u32 CountLeadingZeroes32(u32 value) {
return static_cast<u32>(__builtin_clz(value));
}
inline u32 CountLeadingZeroes64(u64 value) {
[[nodiscard]] inline u32 CountLeadingZeroes64(u64 value) {
if (value == 0) {
return 64;
}
@ -60,7 +60,7 @@ inline u32 CountLeadingZeroes64(u64 value) {
#endif
#ifdef _MSC_VER
inline u32 CountTrailingZeroes32(u32 value) {
[[nodiscard]] inline u32 CountTrailingZeroes32(u32 value) {
unsigned long trailing_zero = 0;
if (_BitScanForward(&trailing_zero, value) != 0) {
@ -70,7 +70,7 @@ inline u32 CountTrailingZeroes32(u32 value) {
return 32;
}
inline u32 CountTrailingZeroes64(u64 value) {
[[nodiscard]] inline u32 CountTrailingZeroes64(u64 value) {
unsigned long trailing_zero = 0;
if (_BitScanForward64(&trailing_zero, value) != 0) {
@ -80,7 +80,7 @@ inline u32 CountTrailingZeroes64(u64 value) {
return 64;
}
#else
inline u32 CountTrailingZeroes32(u32 value) {
[[nodiscard]] inline u32 CountTrailingZeroes32(u32 value) {
if (value == 0) {
return 32;
}
@ -88,7 +88,7 @@ inline u32 CountTrailingZeroes32(u32 value) {
return static_cast<u32>(__builtin_ctz(value));
}
inline u32 CountTrailingZeroes64(u64 value) {
[[nodiscard]] inline u32 CountTrailingZeroes64(u64 value) {
if (value == 0) {
return 64;
}
@ -99,13 +99,13 @@ inline u32 CountTrailingZeroes64(u64 value) {
#ifdef _MSC_VER
inline u32 MostSignificantBit32(const u32 value) {
[[nodiscard]] inline u32 MostSignificantBit32(const u32 value) {
unsigned long result;
_BitScanReverse(&result, value);
return static_cast<u32>(result);
}
inline u32 MostSignificantBit64(const u64 value) {
[[nodiscard]] inline u32 MostSignificantBit64(const u64 value) {
unsigned long result;
_BitScanReverse64(&result, value);
return static_cast<u32>(result);
@ -113,30 +113,30 @@ inline u32 MostSignificantBit64(const u64 value) {
#else
inline u32 MostSignificantBit32(const u32 value) {
[[nodiscard]] inline u32 MostSignificantBit32(const u32 value) {
return 31U - static_cast<u32>(__builtin_clz(value));
}
inline u32 MostSignificantBit64(const u64 value) {
[[nodiscard]] inline u32 MostSignificantBit64(const u64 value) {
return 63U - static_cast<u32>(__builtin_clzll(value));
}
#endif
inline u32 Log2Floor32(const u32 value) {
[[nodiscard]] inline u32 Log2Floor32(const u32 value) {
return MostSignificantBit32(value);
}
inline u32 Log2Ceil32(const u32 value) {
[[nodiscard]] inline u32 Log2Ceil32(const u32 value) {
const u32 log2_f = Log2Floor32(value);
return log2_f + ((value ^ (1U << log2_f)) != 0U);
}
inline u32 Log2Floor64(const u64 value) {
[[nodiscard]] inline u32 Log2Floor64(const u64 value) {
return MostSignificantBit64(value);
}
inline u32 Log2Ceil64(const u64 value) {
[[nodiscard]] inline u32 Log2Ceil64(const u64 value) {
const u64 log2_f = static_cast<u64>(Log2Floor64(value));
return static_cast<u32>(log2_f + ((value ^ (1ULL << log2_f)) != 0ULL));
}