Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86: cabac: remove hardcoded struct offsets from inline asm

Browse Source 
Signed-off-by: Mans Rullgard <mans@mansr.com>
pull/2/head
Mans Rullgard 14 years ago
parent 34ee43fc0f
commit 6b712acc0e
2 changed files with 41 additions and 40 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 47
      libavcodec/cabac.h
  2. 34
      libavcodec/x86/h264_i386.h

47
libavcodec/cabac.h
Unescape View File

@ -27,6 +27,8 @@
#ifndef AVCODEC_CABAC_H
#define AVCODEC_CABAC_H
#include <stddef.h>
#include "put_bits.h"
//#undef NDEBUG
@ -307,17 +309,6 @@ static inline void renorm_cabac_decoder_once(CABACContext *c){
static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){
//FIXME gcc generates duplicate load/stores for c->low and c->range
#define LOW "0"
#define RANGE "4"
#if ARCH_X86_64
#define BYTESTART "16"
#define BYTE "24"
#define BYTEEND "32"
#else
#define BYTESTART "12"
#define BYTE "16"
#define BYTEEND "20"
#endif
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
int bit;
@ -347,7 +338,7 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
#endif /* HAVE_FAST_CMOV */
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte, byte) \
"movzbl "statep" , "ret" \n\t"\
"mov "range" , "tmp" \n\t"\
"and $0xC0 , "range" \n\t"\
@ -361,13 +352,13 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
"shl %%cl , "low" \n\t"\
"test "lowword" , "lowword" \n\t"\
" jnz 1f \n\t"\
"mov "BYTE"("cabac"), %%"REG_c" \n\t"\
"mov "byte"("cabac"), %%"REG_c" \n\t"\
"movzwl (%%"REG_c") , "tmp" \n\t"\
"bswap "tmp" \n\t"\
"shr $15 , "tmp" \n\t"\
"sub $0xFFFF , "tmp" \n\t"\
"add $2 , %%"REG_c" \n\t"\
"mov %%"REG_c" , "BYTE "("cabac") \n\t"\
"mov %%"REG_c" , "byte "("cabac") \n\t"\
"lea -1("low") , %%ecx \n\t"\
"xor "low" , %%ecx \n\t"\
"shr $15 , %%ecx \n\t"\
@ -379,14 +370,16 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
"1: \n\t"
__asm__ volatile(
"movl "RANGE "(%2), %%esi \n\t"
"movl "LOW "(%2), %%ebx \n\t"
BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
"movl %%esi, "RANGE "(%2) \n\t"
"movl %%ebx, "LOW "(%2) \n\t"
"movl %a3(%2), %%esi \n\t"
"movl %a4(%2), %%ebx \n\t"
BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl", "%a5")
"movl %%esi, %a3(%2) \n\t"
"movl %%ebx, %a4(%2) \n\t"
:"=&a"(bit)
:"r"(state), "r"(c)
:"r"(state), "r"(c),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream))
: "%"REG_c, "%ebx", "%edx", "%esi", "memory"
);
bit&=1;
@ -442,8 +435,8 @@ static int av_unused get_cabac_bypass(CABACContext *c){
static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
#if ARCH_X86 && HAVE_EBX_AVAILABLE
__asm__ volatile(
"movl "RANGE "(%1), %%ebx \n\t"
"movl "LOW "(%1), %%eax \n\t"
"movl %a2(%1), %%ebx \n\t"
"movl %a3(%1), %%eax \n\t"
"shl $17, %%ebx \n\t"
"add %%eax, %%eax \n\t"
"sub %%ebx, %%eax \n\t"
@ -454,19 +447,21 @@ static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
"sub %%edx, %%ecx \n\t"
"test %%ax, %%ax \n\t"
" jnz 1f \n\t"
"mov "BYTE "(%1), %%"REG_b" \n\t"
"mov %a4(%1), %%"REG_b" \n\t"
"subl $0xFFFF, %%eax \n\t"
"movzwl (%%"REG_b"), %%edx \n\t"
"bswap %%edx \n\t"
"shrl $15, %%edx \n\t"
"add $2, %%"REG_b" \n\t"
"addl %%edx, %%eax \n\t"
"mov %%"REG_b", "BYTE "(%1) \n\t"
"mov %%"REG_b", %a4(%1) \n\t"
"1: \n\t"
"movl %%eax, "LOW "(%1) \n\t"
"movl %%eax, %a3(%1) \n\t"
:"+c"(val)
:"r"(c)
:"r"(c),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream))
: "%eax", "%"REG_b, "%edx", "memory"
);
return val;

34
libavcodec/x86/h264_i386.h
Unescape View File

@ -29,6 +29,8 @@
#ifndef AVCODEC_X86_H264_I386_H
#define AVCODEC_X86_H264_I386_H
#include <stddef.h>
#include "libavcodec/cabac.h"
//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
@ -42,20 +44,20 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
int minusindex= 4-(int)index;
int coeff_count;
__asm__ volatile(
"movl "RANGE "(%3), %%esi \n\t"
"movl "LOW "(%3), %%ebx \n\t"
"movl %a8(%3), %%esi \n\t"
"movl %a9(%3), %%ebx \n\t"
"2: \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"%%bx", "%%esi", "%%eax", "%%al", "%a10")
"test $1, %%edx \n\t"
" jz 3f \n\t"
"add %7, %1 \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"%%bx", "%%esi", "%%eax", "%%al", "%a10")
"sub %7, %1 \n\t"
"mov %2, %%"REG_a" \n\t"
@ -81,10 +83,12 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
"add %6, %%eax \n\t"
"shr $2, %%eax \n\t"
"movl %%esi, "RANGE "(%3) \n\t"
"movl %%ebx, "LOW "(%3) \n\t"
"movl %%esi, %a8(%3) \n\t"
"movl %%ebx, %a9(%3) \n\t"
:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off)
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream))
: "%"REG_c, "%ebx", "%edx", "%esi", "memory"
);
return coeff_count;
@ -97,8 +101,8 @@ static int decode_significance_8x8_x86(CABACContext *c,
int coeff_count;
x86_reg last=0;
__asm__ volatile(
"movl "RANGE "(%3), %%esi \n\t"
"movl "LOW "(%3), %%ebx \n\t"
"movl %a8(%3), %%esi \n\t"
"movl %a9(%3), %%ebx \n\t"
"mov %1, %%"REG_D" \n\t"
"2: \n\t"
@ -108,7 +112,7 @@ static int decode_significance_8x8_x86(CABACContext *c,
"add %5, %%"REG_D" \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"%%bx", "%%esi", "%%eax", "%%al", "%a10")
"mov %1, %%edi \n\t"
"test $1, %%edx \n\t"
@ -119,7 +123,7 @@ static int decode_significance_8x8_x86(CABACContext *c,
"add %7, %%"REG_D" \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"%%bx", "%%esi", "%%eax", "%%al", "%a10")
"mov %2, %%"REG_a" \n\t"
"mov %1, %%edi \n\t"
@ -142,10 +146,12 @@ static int decode_significance_8x8_x86(CABACContext *c,
"addl %4, %%eax \n\t"
"shr $2, %%eax \n\t"
"movl %%esi, "RANGE "(%3) \n\t"
"movl %%ebx, "LOW "(%3) \n\t"
"movl %%esi, %a8(%3) \n\t"
"movl %%ebx, %a9(%3) \n\t"
:"=&a"(coeff_count),"+m"(last), "+m"(index)
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off)
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream))
: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
);
return coeff_count;

Write Preview
Loading…
Cancel
Save