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libavutil: add saturating addition functions

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Fixed-point audio codecs often use saturating arithmetic, and
special instructions for these operations are common.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard
2012-08-11 01:15:19 +01:00
parent 17c11cef9f
commit 6c4975eaaf
2 changed files with 45 additions and 0 deletions
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15
libavutil/arm/intmath.h
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@@ -83,6 +83,21 @@ static av_always_inline av_const unsigned av_clip_uintp2_arm(int a, int p)
return x;
}
#define av_sat_add32 av_sat_add32_arm
static av_always_inline int av_sat_add32_arm(int a, int b)
{
int r;
__asm__ ("qadd %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
return r;
}
#define av_sat_dadd32 av_sat_dadd32_arm
static av_always_inline int av_sat_dadd32_arm(int a, int b)
{
int r;
__asm__ ("qdadd %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
return r;
}
#else /* HAVE_ARMV6 */