From 6c4975eaafd7f8f91e81ad8d6be744a434241fd3 Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Sat, 11 Aug 2012 01:15:19 +0100 Subject: libavutil: add saturating addition functions Fixed-point audio codecs often use saturating arithmetic, and special instructions for these operations are common. Signed-off-by: Mans Rullgard --- libavutil/arm/intmath.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'libavutil/arm') diff --git a/libavutil/arm/intmath.h b/libavutil/arm/intmath.h index ce73404b37..d5a343c95f 100644 --- a/libavutil/arm/intmath.h +++ b/libavutil/arm/intmath.h @@ -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 */ -- cgit v1.2.3