From 3d6f86eb2ff21f12d9f884a8271aa783f5046ae0 Mon Sep 17 00:00:00 2001 From: Jens Arnold Date: Sun, 16 Aug 2009 12:41:04 +0000 Subject: Make those functions actually inline. Around 20% speedup on coldfire, 10% speedup on arm. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22344 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libatrac/fixp_math.c | 66 ---------------------------------------- 1 file changed, 66 deletions(-) delete mode 100644 apps/codecs/libatrac/fixp_math.c (limited to 'apps/codecs/libatrac/fixp_math.c') diff --git a/apps/codecs/libatrac/fixp_math.c b/apps/codecs/libatrac/fixp_math.c deleted file mode 100644 index 3f578a1ade..0000000000 --- a/apps/codecs/libatrac/fixp_math.c +++ /dev/null @@ -1,66 +0,0 @@ -#include "fixp_math.h" - -inline int32_t fixmul31(int32_t x, int32_t y) -{ - int64_t temp; - temp = x; - temp *= y; - - temp >>= 31; //16+31-16 = 31 bits - - return (int32_t)temp; -} - -/* - * Fast integer square root adapted from algorithm, - * Martin Guy @ UKC, June 1985. - * Originally from a book on programming abaci by Mr C. Woo. - * This is taken from : - * http://wiki.forum.nokia.com/index.php/How_to_use_fixed_point_maths#How_to_get_square_root_for_integers - * with a added shift up of the result by 8 bits to return result in 16.16 fixed-point representation. - */ -inline int32_t fastSqrt(int32_t n) -{ - /* - * Logically, these are unsigned. - * We need the sign bit to test - * whether (op - res - one) underflowed. - */ - int32_t op, res, one; - op = n; - res = 0; - /* "one" starts at the highest power of four <= than the argument. */ - one = 1 << 30; /* second-to-top bit set */ - while (one > op) one >>= 2; - while (one != 0) - { - if (op >= res + one) - { - op = op - (res + one); - res = res + (one<<1); - } - res >>= 1; - one >>= 2; - } - return(res << 8); -} - -inline int32_t fixmul16(int32_t x, int32_t y) -{ - int64_t temp; - temp = x; - temp *= y; - - temp >>= 16; - - return (int32_t)temp; -} - -inline int32_t fixdiv16(int32_t x, int32_t y) -{ - int64_t temp; - temp = x << 16; - temp /= y; - - return (int32_t)temp; -} -- cgit v1.2.3