Mercurial > sdl-ios-xcode
diff src/video/SDL_blit.h @ 91:e85e03f195b4
From: "Markus F.X.J. Oberhumer"
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.
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Sat, 07 Jul 2001 20:20:17 +0000 |
| parents | 74212992fb08 |
| children | 2dc7252dc53e |
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--- a/src/video/SDL_blit.h Sat Jul 07 08:08:42 2001 +0000 +++ b/src/video/SDL_blit.h Sat Jul 07 20:20:17 2001 +0000 @@ -384,7 +384,7 @@ /* 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 @@ /* 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; \