glx: Use the same endian swapping as the rest of the server.

This dumps a ton of configure-time checks for system endian macros.
Given that we're marking the mixed-endian fixup code as cold, getting
at the system macros is a waste of code.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Keith Packard <keithp@keithp.com>

configure.ac

@@ -147,66 +147,6 @@ fi
 
 AC_TYPE_PID_T
 
-# Checks for headers/macros for byte swapping
-# Known variants:
-#	<byteswap.h> bswap_16, bswap_32, bswap_64  (glibc)
-#	<sys/endian.h> __swap16, __swap32, __swap64 (OpenBSD)
-#	<sys/endian.h> bswap16, bswap32, bswap64 (other BSD's)
-#	and a fallback to local macros if none of the above are found
-
-# if <byteswap.h> is found, assume it's the correct version
-AC_CHECK_HEADERS([byteswap.h])
-
-# if <sys/endian.h> is found, have to check which version
-AC_CHECK_HEADER([sys/endian.h], [HAVE_SYS_ENDIAN_H="yes"], [HAVE_SYS_ENDIAN_H="no"])
-
-if test "x$HAVE_SYS_ENDIAN_H" = "xyes" ; then
-	AC_MSG_CHECKING([for __swap16 variant of <sys/endian.h> byteswapping macros])
-	AC_LINK_IFELSE([AC_LANG_PROGRAM([
-#include <sys/types.h>
-#include <sys/endian.h>
- ], [
-int a = 1, b;
-b = __swap16(a);
- ])
-], [SYS_ENDIAN__SWAP='yes'], [SYS_ENDIAN__SWAP='no'])
-	AC_MSG_RESULT([$SYS_ENDIAN__SWAP])
-
-	AC_MSG_CHECKING([for bswap16 variant of <sys/endian.h> byteswapping macros])
-	AC_LINK_IFELSE([AC_LANG_PROGRAM([
-#include <sys/types.h>
-#include <sys/endian.h>
- ], [
-int a = 1, b;
-b = bswap16(a);
- ])
-], [SYS_ENDIAN_BSWAP='yes'], [SYS_ENDIAN_BSWAP='no'])
-	AC_MSG_RESULT([$SYS_ENDIAN_BSWAP])
-
-    	if test "$SYS_ENDIAN_BSWAP" = "yes" ; then
-		USE_SYS_ENDIAN_H=yes
-		BSWAP=bswap
-	else	
-	    	if test "$SYS_ENDIAN__SWAP" = "yes" ; then
-			USE_SYS_ENDIAN_H=yes
-			BSWAP=__swap
-		else
-			USE_SYS_ENDIAN_H=no
-		fi
-	fi
-
-	if test "$USE_SYS_ENDIAN_H" = "yes" ; then
-	    AC_DEFINE([USE_SYS_ENDIAN_H], 1, 
-		[Define to use byteswap macros from <sys/endian.h>])
-	    AC_DEFINE_UNQUOTED([bswap_16], ${BSWAP}16, 
-			[Define to 16-bit byteswap macro])
-	    AC_DEFINE_UNQUOTED([bswap_32], ${BSWAP}32, 
-			[Define to 32-bit byteswap macro])
-	    AC_DEFINE_UNQUOTED([bswap_64], ${BSWAP}64, 
-			[Define to 64-bit byteswap macro])
-	fi
-fi
-
 dnl Check to see if dlopen is in default libraries (like Solaris, which
 dnl has it in libc), or if libdl is needed to get it.
 AC_CHECK_FUNC([dlopen], [],

glx/glxbyteorder.h

@@ -35,27 +35,27 @@
 #include <dix-config.h>
 #endif
 
-#if HAVE_BYTESWAP_H
+#include "misc.h"
-#include <byteswap.h>
-#elif defined(USE_SYS_ENDIAN_H)
-#include <sys/endian.h>
-#elif defined(__APPLE__)
-#include <libkern/OSByteOrder.h>
-#define bswap_16 OSSwapInt16
-#define bswap_32 OSSwapInt32
-#define bswap_64 OSSwapInt64
-#else
-#define	bswap_16(value)  \
- 	((((value) & 0xff) << 8) | ((value) >> 8))
 
-#define	bswap_32(value)	\
+static inline uint16_t
- 	(((uint32_t)bswap_16((uint16_t)((value) & 0xffff)) << 16) | \
+bswap_16(uint16_t val)
- 	(uint32_t)bswap_16((uint16_t)((value) >> 16)))
+{
+    swap_uint16(&val);
+    return val;
+}
 
-#define	bswap_64(value)	\
+static inline uint32_t
- 	(((uint64_t)bswap_32((uint32_t)((value) & 0xffffffff)) \
+bswap_32(uint32_t val)
- 	    << 32) | \
+{
- 	(uint64_t)bswap_32((uint32_t)((value) >> 32)))
+    swap_uint32(&val);
-#endif
+    return val;
+}
+
+static inline uint64_t
+bswap_64(uint64_t val)
+{
+    swap_uint64(&val);
+    return val;
+}
 
 #endif                          /* !defined(__GLXBYTEORDER_H__) */

include/dix-config.h.in

@@ -63,9 +63,6 @@
 /* Has libunwind support */
 #undef HAVE_LIBUNWIND
 
-/* Define to 1 if you have the <byteswap.h> header file. */
-#undef HAVE_BYTESWAP_H
-
 /* Define to 1 if you have the `cbrt' function. */
 #undef HAVE_CBRT
 
@@ -322,9 +319,6 @@
 /* Support UNIX socket connections */
 #undef UNIXCONN
 
-/* Define to use byteswap macros from <sys/endian.h> */
-#undef USE_SYS_ENDIAN_H
-
 /* unaligned word accesses behave as expected */
 #undef WORKING_UNALIGNED_INT
 
@@ -454,15 +448,6 @@
 /* Define to 1 if the DTrace Xserver provider probes should be built in */
 #undef XSERVER_DTRACE
 
-/* Define to 16-bit byteswap macro */
-#undef bswap_16
-
-/* Define to 32-bit byteswap macro */
-#undef bswap_32
-
-/* Define to 64-bit byteswap macro */
-#undef bswap_64
-
 /* Define to 1 if typeof works with your compiler. */
 #undef HAVE_TYPEOF