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From: "Markus F.X.J. Oberhumer"

Browse source 
Subject: SDL CVS patches

below you will find some small patches against the
current SDL CVS.

It adresses these things:

1) Use "&" instead of "%" in some cases. For negative
   signed integers (x % 8) is not always (x & 7),
   and the compiler can produce slightly faster
   code when using "&" here.

2) Some const issues.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%4092
This commit is contained in:
Sam Lantinga 2001-07-07 20:20:17 +00:00
parent b4001bd1ff
commit 6369aeaaa5
8 changed files with 53 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/video/SDL_blit.h
View file

@ -384,7 +384,7 @@ do { \
/* 8-times unrolled loop */
#define DUFFS_LOOP8(pixel_copy_increment, width) \
{ int n = (width+7)/8; \
switch (width % 8) { \
switch (width & 7) { \
case 0: do { pixel_copy_increment; \
case 7: pixel_copy_increment; \
case 6: pixel_copy_increment; \
@ -400,7 +400,7 @@ do { \
/* 4-times unrolled loop */
#define DUFFS_LOOP4(pixel_copy_increment, width) \
{ int n = (width+3)/4; \
switch (width % 4) { \
switch (width & 3) { \
case 0: do { pixel_copy_increment; \
case 3: pixel_copy_increment; \
case 2: pixel_copy_increment; \