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Date: Tue, 19 Aug 2003 17:57:00 +0200

From: Stephane Marchesin
Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection

I think everything is correct now. I've done as much testing as I could,
but some real-world testing wouldn't hurt, I think.
The patch is here :

If you do byte-by-byte comparison of the output between C and MMX
functions, you'll notice that the results for 555 and 565 RGB alpha
blits aren't exactly the same. This is because MMX functions for 555 and
565 RGB have an higher accuracy. If you want the exact same behaviour
that's possible by masking the three lower alpha bits in the MMX
functions. Just ask !

I removed one MMX function because after I fixed it to match its C
equivalent, it revealed to be slower than the C version on a PIII
(although a bit faster on an Athlon XP).

I've also added MMX and PIII replacements for SDL_memcpy. Those provide
some speed up in testvidinfo -benchmark (at least for me, under linux &
  • Loading branch information
slouken committed Aug 22, 2003
1 parent 9095840 commit a713357fba54293440a85248e3225a415501a3ef
Showing with 1,981 additions and 21 deletions.
  1. +1 −0 src/video/
  2. +401 −4 src/video/SDL_RLEaccel.c
  3. +83 −0 src/video/SDL_blit.c
  4. +74 −0 src/video/SDL_blit.h
  5. +716 −17 src/video/SDL_blit_A.c
  6. +706 −0 src/video/mmx.h
@@ -42,6 +42,7 @@ COMMON_SRCS = \
SDL_yuv_sw.c \
SDL_yuv_sw_c.h \
SDL_yuv_mmx.c \
mmx.h \
blank_cursor.h \

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