generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

reorder bswap functions into bit-depth, special-casing inside the functions.

Browse Source 
patch by Ramiro Polla ramiro lisha ufsc br

Originally committed as revision 8823 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2007-04-26 08:20:21 +00:00 committed by Benoit Fouet
parent 853d15c2f8
commit bf5d7db5a0
1 changed files with 14 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
libavutil/bswap.h
View File

@ -36,17 +36,23 @@
# define LEGACY_REGS "=q"
#endif
#if defined(ARCH_X86)
static av_always_inline uint16_t bswap_16(uint16_t x)
{
#if defined(ARCH_X86)
__asm("rorw $8, %0" :
LEGACY_REGS (x) :
"0" (x));
#elif defined(ARCH_SH4)
__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)
{
#if defined(ARCH_X86)
#if __CPU__ != 386
__asm("bswap %0":
"=r" (x) :
@ -57,66 +63,13 @@ static av_always_inline uint32_t bswap_32(uint32_t x)
LEGACY_REGS (x) :
#endif
"0" (x));
return x;
}
static inline uint64_t bswap_64(uint64_t x)
{
#ifdef ARCH_X86_64
__asm("bswap %0":
"=r" (x) :
"0" (x));
return x;
#else
union {
uint64_t ll;
struct {
uint32_t l,h;
} l;
} r;
r.l.l = bswap_32 (x);
r.l.h = bswap_32 (x>>32);
return r.ll;
#endif
}
#elif defined(ARCH_SH4)
static av_always_inline uint16_t bswap_16(uint16_t x) {
__asm__("swap.b %0,%0":"=r"(x):"0"(x));
return x;
}
static av_always_inline uint32_t bswap_32(uint32_t x) {
__asm__(
"swap.b %0,%0\n"
"swap.w %0,%0\n"
"swap.b %0,%0\n"
:"=r"(x):"0"(x));
return x;
}
static inline uint64_t bswap_64(uint64_t x)
{
union {
uint64_t ll;
struct {
uint32_t l,h;
} l;
} r;
r.l.l = bswap_32 (x);
r.l.h = bswap_32 (x>>32);
return r.ll;
}
#else
static av_always_inline uint16_t bswap_16(uint16_t x){
x= (x>>8) | (x<<8);
return x;
}
#ifdef ARCH_ARM
static av_always_inline uint32_t bswap_32(uint32_t x){
#elif defined(ARCH_ARM)
uint32_t t;
__asm__ (
"eor %1, %0, %0, ror #16 \n\t"
@ -124,27 +77,19 @@ static av_always_inline uint32_t bswap_32(uint32_t x){
"mov %0, %0, ror #8 \n\t"
"eor %0, %0, %1, lsr #8 \n\t"
: "+r"(x), "+r"(t));
return x;
}
#elif defined(ARCH_BFIN)
static av_always_inline uint32_t bswap_32(uint32_t x){
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"
: "+d"(x), "=&d"(tmp));
return x;
}
#else
static av_always_inline uint32_t bswap_32(uint32_t x){
x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
x= (x>>16) | (x<<16);
#endif
return x;
}
#endif
static inline uint64_t bswap_64(uint64_t x)
{
@ -152,6 +97,11 @@ static inline uint64_t bswap_64(uint64_t x)
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));
return x;
#else
union {
uint64_t ll;
@ -163,7 +113,6 @@ static inline uint64_t bswap_64(uint64_t x)
return r.ll;
#endif
}
#endif /* defined(ARCH_X86) */
#endif /* !HAVE_BYTESWAP_H */