SDL2/SDL2-endian.patch

From: crrodriguez@opensuse.org
Date: Fri May 11 11:08:39 UTC 2018

Bring up patch from SDL1, use optimized byteswap routines from the C library.

---
 include/SDL_endian.h |  189 +--------------------------------------------------
 1 file changed, 7 insertions(+), 182 deletions(-)

Index: SDL2-2.0.16/include/SDL_endian.h
===================================================================
--- SDL2-2.0.16.orig/include/SDL_endian.h
+++ SDL2-2.0.16/include/SDL_endian.h
@@ -54,35 +54,17 @@ _m_prefetch(void *__P)
  *  \name The two types of endianness
  */
 /* @{ */
-#define SDL_LIL_ENDIAN  1234
-#define SDL_BIG_ENDIAN  4321
+#define SDL_LIL_ENDIAN  __ORDER_LITTLE_ENDIAN__
+#define SDL_BIG_ENDIAN  __ORDER_BIG_ENDIAN__
 /* @} */
 
 #ifndef SDL_BYTEORDER           /* Not defined in SDL_config.h? */
-#ifdef __linux__
-#include <endian.h>
-#define SDL_BYTEORDER  __BYTE_ORDER
-#elif defined(__OpenBSD__)
-#include <endian.h>
-#define SDL_BYTEORDER  BYTE_ORDER
-#elif defined(__FreeBSD__) || defined(__NetBSD__)
-#include <sys/endian.h>
-#define SDL_BYTEORDER  BYTE_ORDER
-#else
-#if defined(__hppa__) || \
-    defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
-    (defined(__MIPS__) && defined(__MIPSEB__)) || \
-    defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
-    defined(__sparc__)
-#define SDL_BYTEORDER   SDL_BIG_ENDIAN
-#else
-#define SDL_BYTEORDER   SDL_LIL_ENDIAN
-#endif
-#endif /* __linux__ */
+#define SDL_BYTEORDER  __BYTE_ORDER__
 #endif /* !SDL_BYTEORDER */
 
 
 #include "begin_code.h"
+#include <byteswap.h>
 /* Set up for C function definitions, even when using C++ */
 #ifdef __cplusplus
 extern "C" {
@@ -91,180 +73,23 @@ extern "C" {
 /**
  *  \file SDL_endian.h
  */
-#if (defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 2))) || \
-    (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))
-#define SDL_Swap16(x) __builtin_bswap16(x)
-#elif defined(__GNUC__) && defined(__i386__) && \
-   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
-SDL_FORCE_INLINE Uint16
-SDL_Swap16(Uint16 x)
-{
-  __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
-    return x;
-}
-#elif defined(__GNUC__) && defined(__x86_64__)
-SDL_FORCE_INLINE Uint16
-SDL_Swap16(Uint16 x)
-{
-  __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
-    return x;
-}
-#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
-SDL_FORCE_INLINE Uint16
-SDL_Swap16(Uint16 x)
-{
-    int result;
-
-  __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
-    return (Uint16)result;
-}
-#elif defined(__GNUC__) && defined(__aarch64__)
 SDL_FORCE_INLINE Uint16
 SDL_Swap16(Uint16 x)
 {
-  __asm__("rev16 %w1, %w0" : "=r"(x) : "r"(x));
-  return x;
-}
-#elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
-SDL_FORCE_INLINE Uint16
-SDL_Swap16(Uint16 x)
-{
-  __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
-    return x;
-}
-#elif defined(_MSC_VER)
-#pragma intrinsic(_byteswap_ushort)
-#define SDL_Swap16(x) _byteswap_ushort(x)
-#elif defined(__WATCOMC__) && defined(__386__)
-extern _inline Uint16 SDL_Swap16(Uint16);
-#pragma aux SDL_Swap16 = \
-  "xchg al, ah" \
-  parm   [ax]   \
-  modify [ax];
-#else
-SDL_FORCE_INLINE Uint16
-SDL_Swap16(Uint16 x)
-{
-    return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
-}
-#endif
-
-#if (defined(__clang__) && (__clang_major__ > 2 || (__clang_major__ == 2 && __clang_minor__ >= 6))) || \
-    (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)))
-#define SDL_Swap32(x) __builtin_bswap32(x)
-#elif defined(__GNUC__) && defined(__i386__) && \
-   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
-SDL_FORCE_INLINE Uint32
-SDL_Swap32(Uint32 x)
-{
-  __asm__("bswap %0": "=r"(x):"0"(x));
-    return x;
+    return bswap_16(x);
 }
-#elif defined(__GNUC__) && defined(__x86_64__)
-SDL_FORCE_INLINE Uint32
-SDL_Swap32(Uint32 x)
-{
-  __asm__("bswapl %0": "=r"(x):"0"(x));
-    return x;
-}
-#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
-SDL_FORCE_INLINE Uint32
-SDL_Swap32(Uint32 x)
-{
-    Uint32 result;
 
-  __asm__("rlwimi %0,%2,24,16,23": "=&r"(result): "0" (x>>24),  "r"(x));
-  __asm__("rlwimi %0,%2,8,8,15"  : "=&r"(result): "0" (result), "r"(x));
-  __asm__("rlwimi %0,%2,24,0,7"  : "=&r"(result): "0" (result), "r"(x));
-    return result;
-}
-#elif defined(__GNUC__) && defined(__aarch64__)
-SDL_FORCE_INLINE Uint32
-SDL_Swap32(Uint32 x)
-{
-  __asm__("rev %w1, %w0": "=r"(x):"r"(x));
-  return x;
-}
-#elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
-SDL_FORCE_INLINE Uint32
-SDL_Swap32(Uint32 x)
-{
-  __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
-    return x;
-}
-#elif defined(__WATCOMC__) && defined(__386__)
-extern _inline Uint32 SDL_Swap32(Uint32);
-#pragma aux SDL_Swap32 = \
-  "bswap eax"  \
-  parm   [eax] \
-  modify [eax];
-#elif defined(_MSC_VER)
-#pragma intrinsic(_byteswap_ulong)
-#define SDL_Swap32(x) _byteswap_ulong(x)
-#else
 SDL_FORCE_INLINE Uint32
 SDL_Swap32(Uint32 x)
 {
-    return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
-                                    ((x >> 8) & 0x0000FF00) | (x >> 24)));
+    return bswap_32(x);
 }
-#endif
 
-#if (defined(__clang__) && (__clang_major__ > 2 || (__clang_major__ == 2 && __clang_minor__ >= 6))) || \
-    (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)))
-#define SDL_Swap64(x) __builtin_bswap64(x)
-#elif defined(__GNUC__) && defined(__i386__) && \
-   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
-SDL_FORCE_INLINE Uint64
-SDL_Swap64(Uint64 x)
-{
-    union {
-        struct {
-            Uint32 a, b;
-        } s;
-        Uint64 u;
-    } v;
-    v.u = x;
-  __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
-          : "=r"(v.s.a), "=r"(v.s.b)
-          : "0" (v.s.a),  "1"(v.s.b));
-    return v.u;
-}
-#elif defined(__GNUC__) && defined(__x86_64__)
 SDL_FORCE_INLINE Uint64
 SDL_Swap64(Uint64 x)
 {
-  __asm__("bswapq %0": "=r"(x):"0"(x));
-    return x;
+    return bswap_64(x);
 }
-#elif defined(__WATCOMC__) && defined(__386__)
-extern _inline Uint64 SDL_Swap64(Uint64);
-#pragma aux SDL_Swap64 = \
-  "bswap eax"     \
-  "bswap edx"     \
-  "xchg eax,edx"  \
-  parm [eax edx]  \
-  modify [eax edx];
-#elif defined(_MSC_VER)
-#pragma intrinsic(_byteswap_uint64)
-#define SDL_Swap64(x) _byteswap_uint64(x)
-#else
-SDL_FORCE_INLINE Uint64
-SDL_Swap64(Uint64 x)
-{
-    Uint32 hi, lo;
-
-    /* Separate into high and low 32-bit values and swap them */
-    lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
-    x >>= 32;
-    hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
-    x = SDL_Swap32(lo);
-    x <<= 32;
-    x |= SDL_Swap32(hi);
-    return (x);
-}
-#endif
-
 
 SDL_FORCE_INLINE float
 SDL_SwapFloat(float x)