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authorbunnei <bunneidev@gmail.com>2019-04-13 03:52:16 +0200
committerGitHub <noreply@github.com>2019-04-13 03:52:16 +0200
commit0faf7b17a166342da1263f11d7c65dcd58116f20 (patch)
tree061583b42b7659bdb8a4ca248ebaf0e1b6bf79bc
parentMerge pull request #2235 from ReinUsesLisp/spirv-decompiler (diff)
parentcommon/swap: Improve codegen of the default swap fallbacks (diff)
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-rw-r--r--src/common/swap.h96
1 files changed, 27 insertions, 69 deletions
diff --git a/src/common/swap.h b/src/common/swap.h
index b3eab1324..71932c2bb 100644
--- a/src/common/swap.h
+++ b/src/common/swap.h
@@ -21,11 +21,6 @@
#if defined(_MSC_VER)
#include <cstdlib>
-#elif defined(__linux__)
-#include <byteswap.h>
-#elif defined(__Bitrig__) || defined(__DragonFly__) || defined(__FreeBSD__) || \
- defined(__NetBSD__) || defined(__OpenBSD__)
-#include <sys/endian.h>
#endif
#include <cstring>
#include "common/common_types.h"
@@ -62,86 +57,49 @@
namespace Common {
#ifdef _MSC_VER
-inline u16 swap16(u16 _data) {
- return _byteswap_ushort(_data);
+[[nodiscard]] inline u16 swap16(u16 data) noexcept {
+ return _byteswap_ushort(data);
}
-inline u32 swap32(u32 _data) {
- return _byteswap_ulong(_data);
+[[nodiscard]] inline u32 swap32(u32 data) noexcept {
+ return _byteswap_ulong(data);
}
-inline u64 swap64(u64 _data) {
- return _byteswap_uint64(_data);
+[[nodiscard]] inline u64 swap64(u64 data) noexcept {
+ return _byteswap_uint64(data);
}
-#elif defined(ARCHITECTURE_ARM) && (__ARM_ARCH >= 6)
-inline u16 swap16(u16 _data) {
- u32 data = _data;
- __asm__("rev16 %0, %1\n" : "=l"(data) : "l"(data));
- return (u16)data;
-}
-inline u32 swap32(u32 _data) {
- __asm__("rev %0, %1\n" : "=l"(_data) : "l"(_data));
- return _data;
-}
-inline u64 swap64(u64 _data) {
- return ((u64)swap32(_data) << 32) | swap32(_data >> 32);
-}
-#elif __linux__
-inline u16 swap16(u16 _data) {
- return bswap_16(_data);
-}
-inline u32 swap32(u32 _data) {
- return bswap_32(_data);
-}
-inline u64 swap64(u64 _data) {
- return bswap_64(_data);
-}
-#elif __APPLE__
-inline __attribute__((always_inline)) u16 swap16(u16 _data) {
- return (_data >> 8) | (_data << 8);
-}
-inline __attribute__((always_inline)) u32 swap32(u32 _data) {
- return __builtin_bswap32(_data);
-}
-inline __attribute__((always_inline)) u64 swap64(u64 _data) {
- return __builtin_bswap64(_data);
-}
-#elif defined(__Bitrig__) || defined(__OpenBSD__)
+#elif defined(__clang__) || defined(__GNUC__)
+#if defined(__Bitrig__) || defined(__OpenBSD__)
// redefine swap16, swap32, swap64 as inline functions
#undef swap16
#undef swap32
#undef swap64
-inline u16 swap16(u16 _data) {
- return __swap16(_data);
-}
-inline u32 swap32(u32 _data) {
- return __swap32(_data);
-}
-inline u64 swap64(u64 _data) {
- return __swap64(_data);
-}
-#elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__)
-inline u16 swap16(u16 _data) {
- return bswap16(_data);
+#endif
+[[nodiscard]] inline u16 swap16(u16 data) noexcept {
+ return __builtin_bswap16(data);
}
-inline u32 swap32(u32 _data) {
- return bswap32(_data);
+[[nodiscard]] inline u32 swap32(u32 data) noexcept {
+ return __builtin_bswap32(data);
}
-inline u64 swap64(u64 _data) {
- return bswap64(_data);
+[[nodiscard]] inline u64 swap64(u64 data) noexcept {
+ return __builtin_bswap64(data);
}
#else
-// Slow generic implementation.
-inline u16 swap16(u16 data) {
+// Generic implementation.
+[[nodiscard]] inline u16 swap16(u16 data) noexcept {
return (data >> 8) | (data << 8);
}
-inline u32 swap32(u32 data) {
- return (swap16(data) << 16) | swap16(data >> 16);
+[[nodiscard]] inline u32 swap32(u32 data) noexcept {
+ return ((data & 0xFF000000U) >> 24) | ((data & 0x00FF0000U) >> 8) |
+ ((data & 0x0000FF00U) << 8) | ((data & 0x000000FFU) << 24);
}
-inline u64 swap64(u64 data) {
- return ((u64)swap32(data) << 32) | swap32(data >> 32);
+[[nodiscard]] inline u64 swap64(u64 data) noexcept {
+ return ((data & 0xFF00000000000000ULL) >> 56) | ((data & 0x00FF000000000000ULL) >> 40) |
+ ((data & 0x0000FF0000000000ULL) >> 24) | ((data & 0x000000FF00000000ULL) >> 8) |
+ ((data & 0x00000000FF000000ULL) << 8) | ((data & 0x0000000000FF0000ULL) << 24) |
+ ((data & 0x000000000000FF00ULL) << 40) | ((data & 0x00000000000000FFULL) << 56);
}
#endif
-inline float swapf(float f) {
+[[nodiscard]] inline float swapf(float f) noexcept {
static_assert(sizeof(u32) == sizeof(float), "float must be the same size as uint32_t.");
u32 value;
@@ -153,7 +111,7 @@ inline float swapf(float f) {
return f;
}
-inline double swapd(double f) {
+[[nodiscard]] inline double swapd(double f) noexcept {
static_assert(sizeof(u64) == sizeof(double), "double must be the same size as uint64_t.");
u64 value;