From b99f3cabeddf98264fd73fd6757255220651ce62 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 11 Oct 2006 16:11:41 +0000 Subject: [PATCH] write cabac low and range variables as early as possible to prevent stalls from reading them before they where written, the P4 is said to disslike that alot, on P3 its 2% faster (START/STOP_TIMER over decode_residual) Originally committed as revision 6657 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/cabac.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/libavcodec/cabac.h b/libavcodec/cabac.h index c852aa539d..473e7cf84a 100644 --- a/libavcodec/cabac.h +++ b/libavcodec/cabac.h @@ -478,8 +478,10 @@ static int get_cabac(CABACContext *c, uint8_t * const state){ "shr $19, %%esi \n\t" "movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t" - "shll %%cl, %%ebx \n\t" "shll %%cl, %%edx \n\t" + "movl %%edx, "RANGE "(%2) \n\t" + "shll %%cl, %%ebx \n\t" + "movl %%ebx, "LOW "(%2) \n\t" "test %%bx, %%bx \n\t" " jnz 1f \n\t" @@ -500,9 +502,8 @@ static int get_cabac(CABACContext *c, uint8_t * const state){ "shll %%cl , %%esi \n\t" "addl %%esi, %%ebx \n\t" - "1: \n\t" - "movl %%edx, "RANGE "(%2) \n\t" "movl %%ebx, "LOW "(%2) \n\t" + "1: \n\t" :"=&a"(bit) :"r"(state), "r"(c) : "%ecx", "%ebx", "%edx", "%esi"