/**
* @file bswap.h
- * byte swap.
+ * byte swapping routines
*/
-#ifndef BSWAP_H
-#define BSWAP_H
+#ifndef FFMPEG_BSWAP_H
+#define FFMPEG_BSWAP_H
#include <stdint.h>
+#include "config.h"
#include "common.h"
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#else
-#ifdef ARCH_X86_64
-# define LEGACY_REGS "=Q"
-#else
-# define LEGACY_REGS "=q"
-#endif
-
-static av_always_inline uint16_t bswap_16(uint16_t x)
+static av_always_inline av_const uint16_t bswap_16(uint16_t x)
{
#if defined(ARCH_X86)
- __asm("rorw $8, %0" :
- LEGACY_REGS (x) :
- "0" (x));
+ asm("rorw $8, %0" : "+r"(x));
#elif defined(ARCH_SH4)
- __asm__("swap.b %0,%0":"=r"(x):"0"(x));
+ asm("swap.b %0,%0" : "=r"(x) : "0"(x));
#else
x= (x>>8) | (x<<8);
#endif
return x;
}
-static av_always_inline uint32_t bswap_32(uint32_t x)
+static av_always_inline av_const uint32_t bswap_32(uint32_t x)
{
#if defined(ARCH_X86)
-#if __CPU__ != 386
- __asm("bswap %0":
- "=r" (x) :
+#ifdef HAVE_BSWAP
+ asm("bswap %0" : "+r" (x));
#else
- __asm("xchgb %b0,%h0\n"
- " rorl $16,%0\n"
- " xchgb %b0,%h0":
- LEGACY_REGS (x) :
+ asm("rorw $8, %w0 \n\t"
+ "rorl $16, %0 \n\t"
+ "rorw $8, %w0"
+ : "+r"(x));
#endif
- "0" (x));
#elif defined(ARCH_SH4)
- __asm__(
- "swap.b %0,%0\n"
+ asm("swap.b %0,%0\n"
"swap.w %0,%0\n"
"swap.b %0,%0\n"
- :"=r"(x):"0"(x));
+ : "=r"(x) : "0"(x));
#elif defined(ARCH_ARM)
uint32_t t;
- __asm__ (
- "eor %1, %0, %0, ror #16 \n\t"
- "bic %1, %1, #0xFF0000 \n\t"
- "mov %0, %0, ror #8 \n\t"
- "eor %0, %0, %1, lsr #8 \n\t"
- : "+r"(x), "+r"(t));
+ asm ("eor %1, %0, %0, ror #16 \n\t"
+ "bic %1, %1, #0xFF0000 \n\t"
+ "mov %0, %0, ror #8 \n\t"
+ "eor %0, %0, %1, lsr #8 \n\t"
+ : "+r"(x), "+r"(t));
#elif defined(ARCH_BFIN)
unsigned tmp;
- asm("%1 = %0 >> 8 (V);\n\t"
- "%0 = %0 << 8 (V);\n\t"
- "%0 = %0 | %1;\n\t"
- "%0 = PACK(%0.L, %0.H);\n\t"
+ asm("%1 = %0 >> 8 (V); \n\t"
+ "%0 = %0 << 8 (V); \n\t"
+ "%0 = %0 | %1; \n\t"
+ "%0 = PACK(%0.L, %0.H); \n\t"
: "+d"(x), "=&d"(tmp));
#else
x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
return x;
}
-static inline uint64_t bswap_64(uint64_t x)
+static inline uint64_t av_const bswap_64(uint64_t x)
{
#if 0
x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
return (x>>32) | (x<<32);
#elif defined(ARCH_X86_64)
- __asm("bswap %0":
- "=r" (x) :
- "0" (x));
+ asm("bswap %0": "=r" (x) : "0" (x));
return x;
#else
union {
#define le2me_64(x) (x)
#endif
-#endif /* BSWAP_H */
+#endif /* FFMPEG_BSWAP_H */