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authorPhilippe Mathieu-Daudé <philmd@redhat.com>2023-01-11 17:31:42 +0100
committerThomas Huth <thuth@redhat.com>2023-01-26 13:25:07 +0100
commit6366ca31ef31bb69d30356c736bf902f15c1c792 (patch)
treee20c770b766a58f1eb952270415d44d45d18e468
parent2b5e0c9ff8299bbfa1a6b0c9cac385adb733152a (diff)
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qemu/bswap: Replace bswapXX() by compiler __builtin_bswap()
Use the compiler built-in function to byte swap values, as the compiler is clever and will fold constants. Suggested-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20230111163147.71761-2-philmd@linaro.org> Signed-off-by: Thomas Huth <thuth@redhat.com>
-rw-r--r--include/qemu/bswap.h31
1 files changed, 6 insertions, 25 deletions
diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h
index 346d05f..ca2b4c3 100644
--- a/include/qemu/bswap.h
+++ b/include/qemu/bswap.h
@@ -37,31 +37,12 @@ static inline uint64_t bswap64(uint64_t x)
#endif
#ifdef BSWAP_FROM_FALLBACKS
-static inline uint16_t bswap16(uint16_t x)
-{
- return (((x & 0x00ff) << 8) |
- ((x & 0xff00) >> 8));
-}
-
-static inline uint32_t bswap32(uint32_t x)
-{
- return (((x & 0x000000ffU) << 24) |
- ((x & 0x0000ff00U) << 8) |
- ((x & 0x00ff0000U) >> 8) |
- ((x & 0xff000000U) >> 24));
-}
-
-static inline uint64_t bswap64(uint64_t x)
-{
- return (((x & 0x00000000000000ffULL) << 56) |
- ((x & 0x000000000000ff00ULL) << 40) |
- ((x & 0x0000000000ff0000ULL) << 24) |
- ((x & 0x00000000ff000000ULL) << 8) |
- ((x & 0x000000ff00000000ULL) >> 8) |
- ((x & 0x0000ff0000000000ULL) >> 24) |
- ((x & 0x00ff000000000000ULL) >> 40) |
- ((x & 0xff00000000000000ULL) >> 56));
-}
+#undef bswap16
+#define bswap16(_x) __builtin_bswap16(_x)
+#undef bswap32
+#define bswap32(_x) __builtin_bswap32(_x)
+#undef bswap64
+#define bswap64(_x) __builtin_bswap64(_x)
#endif
#undef BSWAP_FROM_BYTESWAP