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https://github.com/xenia-project/FFmpeg.git
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x86: cabac: remove hardcoded struct offsets from inline asm
Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard
parent
34ee43fc0f
commit
6b712acc0e
@ -27,6 +27,8 @@
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#ifndef AVCODEC_CABAC_H
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#define AVCODEC_CABAC_H
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#include <stddef.h>
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#include "put_bits.h"
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//#undef NDEBUG
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@ -307,17 +309,6 @@ static inline void renorm_cabac_decoder_once(CABACContext *c){
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static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){
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//FIXME gcc generates duplicate load/stores for c->low and c->range
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#define LOW "0"
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#define RANGE "4"
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#if ARCH_X86_64
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#define BYTESTART "16"
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#define BYTE "24"
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#define BYTEEND "32"
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#else
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#define BYTESTART "12"
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#define BYTE "16"
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#define BYTEEND "20"
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#endif
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#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
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int bit;
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@ -347,7 +338,7 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
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#endif /* HAVE_FAST_CMOV */
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#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
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#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte, byte) \
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"movzbl "statep" , "ret" \n\t"\
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"mov "range" , "tmp" \n\t"\
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"and $0xC0 , "range" \n\t"\
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@ -361,13 +352,13 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
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"shl %%cl , "low" \n\t"\
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"test "lowword" , "lowword" \n\t"\
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" jnz 1f \n\t"\
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"mov "BYTE"("cabac"), %%"REG_c" \n\t"\
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"mov "byte"("cabac"), %%"REG_c" \n\t"\
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"movzwl (%%"REG_c") , "tmp" \n\t"\
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"bswap "tmp" \n\t"\
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"shr $15 , "tmp" \n\t"\
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"sub $0xFFFF , "tmp" \n\t"\
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"add $2 , %%"REG_c" \n\t"\
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"mov %%"REG_c" , "BYTE "("cabac") \n\t"\
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"mov %%"REG_c" , "byte "("cabac") \n\t"\
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"lea -1("low") , %%ecx \n\t"\
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"xor "low" , %%ecx \n\t"\
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"shr $15 , %%ecx \n\t"\
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@ -379,14 +370,16 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
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"1: \n\t"
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__asm__ volatile(
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"movl "RANGE "(%2), %%esi \n\t"
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"movl "LOW "(%2), %%ebx \n\t"
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BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
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"movl %%esi, "RANGE "(%2) \n\t"
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"movl %%ebx, "LOW "(%2) \n\t"
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"movl %a3(%2), %%esi \n\t"
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"movl %a4(%2), %%ebx \n\t"
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BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl", "%a5")
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"movl %%esi, %a3(%2) \n\t"
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"movl %%ebx, %a4(%2) \n\t"
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:"=&a"(bit)
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:"r"(state), "r"(c)
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:"r"(state), "r"(c),
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"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
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"i"(offsetof(CABACContext, bytestream))
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: "%"REG_c, "%ebx", "%edx", "%esi", "memory"
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);
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bit&=1;
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@ -442,8 +435,8 @@ static int av_unused get_cabac_bypass(CABACContext *c){
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static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
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#if ARCH_X86 && HAVE_EBX_AVAILABLE
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__asm__ volatile(
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"movl "RANGE "(%1), %%ebx \n\t"
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"movl "LOW "(%1), %%eax \n\t"
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"movl %a2(%1), %%ebx \n\t"
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"movl %a3(%1), %%eax \n\t"
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"shl $17, %%ebx \n\t"
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"add %%eax, %%eax \n\t"
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"sub %%ebx, %%eax \n\t"
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@ -454,19 +447,21 @@ static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
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"sub %%edx, %%ecx \n\t"
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"test %%ax, %%ax \n\t"
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" jnz 1f \n\t"
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"mov "BYTE "(%1), %%"REG_b" \n\t"
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"mov %a4(%1), %%"REG_b" \n\t"
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"subl $0xFFFF, %%eax \n\t"
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"movzwl (%%"REG_b"), %%edx \n\t"
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"bswap %%edx \n\t"
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"shrl $15, %%edx \n\t"
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"add $2, %%"REG_b" \n\t"
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"addl %%edx, %%eax \n\t"
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"mov %%"REG_b", "BYTE "(%1) \n\t"
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"mov %%"REG_b", %a4(%1) \n\t"
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"1: \n\t"
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"movl %%eax, "LOW "(%1) \n\t"
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"movl %%eax, %a3(%1) \n\t"
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:"+c"(val)
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:"r"(c)
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:"r"(c),
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"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
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"i"(offsetof(CABACContext, bytestream))
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: "%eax", "%"REG_b, "%edx", "memory"
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);
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return val;
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@ -29,6 +29,8 @@
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#ifndef AVCODEC_X86_H264_I386_H
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#define AVCODEC_X86_H264_I386_H
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#include <stddef.h>
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#include "libavcodec/cabac.h"
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//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
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@ -42,20 +44,20 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
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int minusindex= 4-(int)index;
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int coeff_count;
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__asm__ volatile(
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"movl "RANGE "(%3), %%esi \n\t"
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"movl "LOW "(%3), %%ebx \n\t"
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"movl %a8(%3), %%esi \n\t"
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"movl %a9(%3), %%ebx \n\t"
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"2: \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"%%bx", "%%esi", "%%eax", "%%al", "%a10")
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"test $1, %%edx \n\t"
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" jz 3f \n\t"
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"add %7, %1 \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"%%bx", "%%esi", "%%eax", "%%al", "%a10")
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"sub %7, %1 \n\t"
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"mov %2, %%"REG_a" \n\t"
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@ -81,10 +83,12 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
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"add %6, %%eax \n\t"
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"shr $2, %%eax \n\t"
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"movl %%esi, "RANGE "(%3) \n\t"
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"movl %%ebx, "LOW "(%3) \n\t"
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"movl %%esi, %a8(%3) \n\t"
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"movl %%ebx, %a9(%3) \n\t"
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:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
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:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off)
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:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
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"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
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"i"(offsetof(CABACContext, bytestream))
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: "%"REG_c, "%ebx", "%edx", "%esi", "memory"
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);
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return coeff_count;
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@ -97,8 +101,8 @@ static int decode_significance_8x8_x86(CABACContext *c,
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int coeff_count;
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x86_reg last=0;
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__asm__ volatile(
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"movl "RANGE "(%3), %%esi \n\t"
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"movl "LOW "(%3), %%ebx \n\t"
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"movl %a8(%3), %%esi \n\t"
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"movl %a9(%3), %%ebx \n\t"
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"mov %1, %%"REG_D" \n\t"
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"2: \n\t"
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@ -108,7 +112,7 @@ static int decode_significance_8x8_x86(CABACContext *c,
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"add %5, %%"REG_D" \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"%%bx", "%%esi", "%%eax", "%%al", "%a10")
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"mov %1, %%edi \n\t"
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"test $1, %%edx \n\t"
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@ -119,7 +123,7 @@ static int decode_significance_8x8_x86(CABACContext *c,
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"add %7, %%"REG_D" \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"%%bx", "%%esi", "%%eax", "%%al", "%a10")
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"mov %2, %%"REG_a" \n\t"
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"mov %1, %%edi \n\t"
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@ -142,10 +146,12 @@ static int decode_significance_8x8_x86(CABACContext *c,
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"addl %4, %%eax \n\t"
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"shr $2, %%eax \n\t"
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"movl %%esi, "RANGE "(%3) \n\t"
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"movl %%ebx, "LOW "(%3) \n\t"
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"movl %%esi, %a8(%3) \n\t"
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"movl %%ebx, %a9(%3) \n\t"
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:"=&a"(coeff_count),"+m"(last), "+m"(index)
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:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off)
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:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off),
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"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
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"i"(offsetof(CABACContext, bytestream))
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: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
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);
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return coeff_count;
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