misc: Use GCC builtins for byte-swap operations

Instead of using custom code to byte-swap values, use the built-in
function provided by GCC.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

diff --git a/libpcsxcore/misc.c b/libpcsxcore/misc.c
index 85402fc..e3d227a 100644 (file)
--- a/libpcsxcore/misc.c
+++ b/libpcsxcore/misc.c
@@ -58,14 +58,7 @@ struct iso_directory_record {
 void mmssdd( char *b, char *p )
 {
        int m, s, d;
-#if defined(__arm__)
-       unsigned char *u = (void *)b;
-       int block = (u[3] << 24) | (u[2] << 16) | (u[1] << 8) | u[0];
-#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
-       int block = (b[0] & 0xff) | ((b[1] & 0xff) << 8) | ((b[2] & 0xff) << 16) | (b[3] << 24);
-#else
-       int block = *((int*)b);
-#endif
+       int block = SWAP32(*((uint32_t*) b));
 
        block += 150;
        m = block / 4500;                       // minutes

diff --git a/libpcsxcore/psxmem.h b/libpcsxcore/psxmem.h
index a7c6dd1..c51aebe 100644 (file)
--- a/libpcsxcore/psxmem.h
+++ b/libpcsxcore/psxmem.h
@@ -28,11 +28,8 @@ extern "C" {
 
 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 
-#define _SWAP16(b) ((((unsigned char *)&(b))[0] & 0xff) | (((unsigned char *)&(b))[1] & 0xff) << 8)
-#define _SWAP32(b) ((((unsigned char *)&(b))[0] & 0xff) | ((((unsigned char *)&(b))[1] & 0xff) << 8) | ((((unsigned char *)&(b))[2] & 0xff) << 16) | (((unsigned char *)&(b))[3] << 24))
-
-#define SWAP16(v) ((((v) & 0xff00) >> 8) +(((v) & 0xff) << 8))
-#define SWAP32(v) ((((v) & 0xff000000ul) >> 24) + (((v) & 0xff0000ul) >> 8) + (((v) & 0xff00ul)<<8) +(((v) & 0xfful) << 24))
+#define SWAP16(v) __builtin_bswap16(v)
+#define SWAP32(v) __builtin_bswap32(v)
 #define SWAPu32(v) SWAP32((u32)(v))
 #define SWAPs32(v) SWAP32((s32)(v))