[Git][videolan/libdvdcss][master] bswap: use Clang/GCC builtins for B2N macros

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Jean-Baptiste Kempf pushed to branch master at VideoLAN / libdvdcss


Commits:
abb605b5 by Steve Lhomme at 2025-08-07T11:02:27+02:00
bswap: use Clang/GCC builtins for B2N macros

It should be faster than the OS helpers.

Similar to https://code.videolan.org/videolan/libdvdread/-/merge_requests/50 for libdvdcss.

- - - - -


1 changed file:

- src/bswap.h


Changes:

=====================================
src/bswap.h
=====================================
@@ -30,6 +30,18 @@
 #define B2N_32(x) (void)(x)
 #define B2N_64(x) (void)(x)
 
+#elif defined(__clang__) && __has_builtin (__builtin_bswap16)
+
+#define B2N_16(x) x = __builtin_bswap16(x)
+#define B2N_32(x) x = __builtin_bswap32(x)
+#define B2N_64(x) x = __builtin_bswap64(x)
+
+#elif defined (__GNUC__) && ((__GNUC__ > (4)) || (__GNUC__ == (4) && __GNUC_MINOR__ >= (8)))
+
+#define B2N_16(x) x = __builtin_bswap16(x)
+#define B2N_32(x) x = __builtin_bswap32(x)
+#define B2N_64(x) x = __builtin_bswap64(x)
+
 #else
 
 /* For __FreeBSD_version */



View it on GitLab: https://code.videolan.org/videolan/libdvdcss/-/commit/abb605b5bc985cb88dabebcd4eec9dde7a90dd2c

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View it on GitLab: https://code.videolan.org/videolan/libdvdcss/-/commit/abb605b5bc985cb88dabebcd4eec9dde7a90dd2c
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