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ARM: faster ARMv6 FASTDIV()

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Originally committed as revision 15712 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Måns Rullgård
2008-10-25 18:54:23 +00:00
parent 590bd200dd
commit b98f10c08a
1 changed files with 6 additions and 5 deletions
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11
libavutil/internal.h
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@ -140,11 +140,12 @@ extern const uint32_t ff_inverse[256];
#elif defined(HAVE_ARMV6) #elif defined(HAVE_ARMV6)
static inline av_const int FASTDIV(int a, int b) static inline av_const int FASTDIV(int a, int b)
{ {
int r; int r, t;
__asm__ volatile("cmp %2, #0 \n\t" __asm__ volatile("cmp %3, #2 \n\t"
"smmul %0, %1, %2 \n\t" "ldr %1, [%4, %3, lsl #2] \n\t"
"rsblt %0, %0, #0 \n\t" "lsrle %0, %2, #1 \n\t"
: "=r"(r) : "r"(a), "r"(ff_inverse[b])); "smmulgt %0, %1, %2 \n\t"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
return r; return r;
} }
#elif defined(ARCH_ARMV4L) #elif defined(ARCH_ARMV4L)