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reading 8bit mem into a 8bit register needs 2 uops on P4, 8bit->32bit with zero extension needs just 1

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Originally committed as revision 6612 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 18 years ago
parent 2d3df05ca0
commit a6672acf45
1 changed files with 7 additions and 7 deletions
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  1. 14
      libavcodec/cabac.h

14
libavcodec/cabac.h
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@ -393,7 +393,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"setb %%cl \n\t"
"shl %%cl, %%edx \n\t"
"shl %%cl, %%ebx \n\t"
"movb "MPS_STATE"(%2, %%eax), %%cl \n\t"
"movzbl "MPS_STATE"(%2, %%eax), %%ecx \n\t"
"movb %%cl, (%1) \n\t"
//eax:state ebx:low, edx:range, esi:RangeLPS
"test %%bx, %%bx \n\t"
@ -412,10 +412,10 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"subl %%edx, %%ebx \n\t"
"movl %%esi, %%edx \n\t"
"shr $19, %%esi \n\t"
"movb " MANGLE(ff_h264_norm_shift) "(%%esi), %%cl \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
"shll %%cl, %%ebx \n\t"
"shll %%cl, %%edx \n\t"
"movb "LPS_STATE"(%2, %%eax), %%cl \n\t"
"movzbl "LPS_STATE"(%2, %%eax), %%ecx \n\t"
"movb %%cl, (%1) \n\t"
"addl $1, %%eax \n\t"
"test %%bx, %%bx \n\t"
@ -432,7 +432,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"leal -1(%%ebx), %%ecx \n\t"
"xorl %%ebx, %%ecx \n\t"
"shrl $17, %%ecx \n\t"
"movb " MANGLE(ff_h264_norm_shift) "(%%ecx), %%cl \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
"neg %%cl \n\t"
"add $7, %%cl \n\t"
@ -470,14 +470,14 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
//eax:state ebx:low edx:mask esi:range
"xorl %%edx, %%eax \n\t"
"movb "MPS_STATE"(%2, %%eax), %%cl \n\t"
"movzbl "MPS_STATE"(%2, %%eax), %%ecx \n\t"
"movb %%cl, (%1) \n\t"
"movl %%esi, %%edx \n\t"
//eax:bit ebx:low edx:range esi:range
"shr $19, %%esi \n\t"
"movb " MANGLE(ff_h264_norm_shift) "(%%esi), %%cl \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
"shll %%cl, %%ebx \n\t"
"shll %%cl, %%edx \n\t"
"test %%bx, %%bx \n\t"
@ -494,7 +494,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"leal -1(%%ebx), %%ecx \n\t"
"xorl %%ebx, %%ecx \n\t"
"shrl $17, %%ecx \n\t"
"movb " MANGLE(ff_h264_norm_shift) "(%%ecx), %%cl \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
"neg %%cl \n\t"
"add $7, %%cl \n\t"

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