From: Paul Cercueil <paul@crapouillou.net>
Date: Thu, 26 May 2022 13:07:41 +0000 (+0100)
Subject: misc: Use GCC builtins for byte-swap operations
X-Git-Tag: r24~361
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96c6ec7055ecef55b3dd221c86b796512bf52107;p=pcsx_rearmed.git

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 b2dd9a12..7aa4fef2 100644
--- 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 3d5317c1..ec4b970a 100644
--- 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))