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x86: cabac: remove hardcoded ebx in inline asm

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-06-20 02:31:53 +01:00
parent 6b712acc0e
commit 018c33838e
2 changed files with 63 additions and 60 deletions
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53
libavcodec/cabac.h
View File

@ -270,7 +270,7 @@ static void refill(CABACContext *c){
c->bytestream+= CABAC_BITS/8; c->bytestream+= CABAC_BITS/8;
} }
#if ! ( ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) ) #if ! ( ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) )
static void refill2(CABACContext *c){ static void refill2(CABACContext *c){
int i, x; int i, x;
@ -309,8 +309,8 @@ static inline void renorm_cabac_decoder_once(CABACContext *c){
static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){ 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 //FIXME gcc generates duplicate load/stores for c->low and c->range
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) #if ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
int bit; int bit, low;
#if HAVE_FAST_CMOV #if HAVE_FAST_CMOV
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\ #define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
@ -370,20 +370,20 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
"1: \n\t" "1: \n\t"
__asm__ volatile( __asm__ volatile(
"movl %a3(%2), %%esi \n\t" "movl %a4(%3), %%esi \n\t"
"movl %a4(%2), %%ebx \n\t" "movl %a5(%3), %1 \n\t"
BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl", "%a5") BRANCHLESS_GET_CABAC("%0", "%3", "(%2)", "%1", "%w1", "%%esi", "%%edx", "%%dl", "%a6")
"movl %%esi, %a3(%2) \n\t" "movl %%esi, %a4(%3) \n\t"
"movl %%ebx, %a4(%2) \n\t" "movl %1, %a5(%3) \n\t"
:"=&a"(bit) :"=&a"(bit), "=&r"(low)
:"r"(state), "r"(c), :"r"(state), "r"(c),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)), "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream)) "i"(offsetof(CABACContext, bytestream))
: "%"REG_c, "%ebx", "%edx", "%esi", "memory" : "%"REG_c, "%edx", "%esi", "memory"
); );
bit&=1; bit&=1;
#else /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) */ #else /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
int s = *state; int s = *state;
int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s]; int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s];
int bit, lps_mask; int bit, lps_mask;
@ -403,7 +403,7 @@ static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const st
c->low <<= lps_mask; c->low <<= lps_mask;
if(!(c->low & CABAC_MASK)) if(!(c->low & CABAC_MASK))
refill2(c); refill2(c);
#endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) */ #endif /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
return bit; return bit;
} }
@ -433,36 +433,37 @@ static int av_unused get_cabac_bypass(CABACContext *c){
static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){ static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
#if ARCH_X86 && HAVE_EBX_AVAILABLE #if ARCH_X86
x86_reg tmp;
__asm__ volatile( __asm__ volatile(
"movl %a2(%1), %%ebx \n\t" "movl %a3(%2), %k1 \n\t"
"movl %a3(%1), %%eax \n\t" "movl %a4(%2), %%eax \n\t"
"shl $17, %%ebx \n\t" "shl $17, %k1 \n\t"
"add %%eax, %%eax \n\t" "add %%eax, %%eax \n\t"
"sub %%ebx, %%eax \n\t" "sub %k1, %%eax \n\t"
"cltd \n\t" "cltd \n\t"
"and %%edx, %%ebx \n\t" "and %%edx, %k1 \n\t"
"add %%ebx, %%eax \n\t" "add %k1, %%eax \n\t"
"xor %%edx, %%ecx \n\t" "xor %%edx, %%ecx \n\t"
"sub %%edx, %%ecx \n\t" "sub %%edx, %%ecx \n\t"
"test %%ax, %%ax \n\t" "test %%ax, %%ax \n\t"
" jnz 1f \n\t" " jnz 1f \n\t"
"mov %a4(%1), %%"REG_b" \n\t" "mov %a5(%2), %1 \n\t"
"subl $0xFFFF, %%eax \n\t" "subl $0xFFFF, %%eax \n\t"
"movzwl (%%"REG_b"), %%edx \n\t" "movzwl (%1), %%edx \n\t"
"bswap %%edx \n\t" "bswap %%edx \n\t"
"shrl $15, %%edx \n\t" "shrl $15, %%edx \n\t"
"add $2, %%"REG_b" \n\t" "add $2, %1 \n\t"
"addl %%edx, %%eax \n\t" "addl %%edx, %%eax \n\t"
"mov %%"REG_b", %a4(%1) \n\t" "mov %1, %a5(%2) \n\t"
"1: \n\t" "1: \n\t"
"movl %%eax, %a3(%1) \n\t" "movl %%eax, %a4(%2) \n\t"
:"+c"(val) :"+c"(val), "=&r"(tmp)
:"r"(c), :"r"(c),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)), "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream)) "i"(offsetof(CABACContext, bytestream))
: "%eax", "%"REG_b, "%edx", "memory" : "%eax", "%edx", "memory"
); );
return val; return val;
#else #else

70
libavcodec/x86/h264_i386.h
View File

@ -35,7 +35,7 @@
//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
//as that would make optimization work hard) //as that would make optimization work hard)
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) #if ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
static int decode_significance_x86(CABACContext *c, int max_coeff, static int decode_significance_x86(CABACContext *c, int max_coeff,
uint8_t *significant_coeff_ctx_base, uint8_t *significant_coeff_ctx_base,
int *index, x86_reg last_off){ int *index, x86_reg last_off){
@ -43,25 +43,26 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
int minusstart= -(int)significant_coeff_ctx_base; int minusstart= -(int)significant_coeff_ctx_base;
int minusindex= 4-(int)index; int minusindex= 4-(int)index;
int coeff_count; int coeff_count;
int low;
__asm__ volatile( __asm__ volatile(
"movl %a8(%3), %%esi \n\t" "movl %a9(%4), %%esi \n\t"
"movl %a9(%3), %%ebx \n\t" "movl %a10(%4), %3 \n\t"
"2: \n\t" "2: \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", BRANCHLESS_GET_CABAC("%%edx", "%4", "(%1)", "%3",
"%%bx", "%%esi", "%%eax", "%%al", "%a10") "%w3", "%%esi", "%%eax", "%%al", "%a11")
"test $1, %%edx \n\t" "test $1, %%edx \n\t"
" jz 3f \n\t" " jz 3f \n\t"
"add %7, %1 \n\t" "add %8, %1 \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", BRANCHLESS_GET_CABAC("%%edx", "%4", "(%1)", "%3",
"%%bx", "%%esi", "%%eax", "%%al", "%a10") "%w3", "%%esi", "%%eax", "%%al", "%a11")
"sub %7, %1 \n\t" "sub %8, %1 \n\t"
"mov %2, %%"REG_a" \n\t" "mov %2, %%"REG_a" \n\t"
"movl %4, %%ecx \n\t" "movl %5, %%ecx \n\t"
"add %1, %%"REG_c" \n\t" "add %1, %%"REG_c" \n\t"
"movl %%ecx, (%%"REG_a") \n\t" "movl %%ecx, (%%"REG_a") \n\t"
@ -73,23 +74,24 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
"3: \n\t" "3: \n\t"
"add $1, %1 \n\t" "add $1, %1 \n\t"
"cmp %5, %1 \n\t" "cmp %6, %1 \n\t"
" jb 2b \n\t" " jb 2b \n\t"
"mov %2, %%"REG_a" \n\t" "mov %2, %%"REG_a" \n\t"
"movl %4, %%ecx \n\t" "movl %5, %%ecx \n\t"
"add %1, %%"REG_c" \n\t" "add %1, %%"REG_c" \n\t"
"movl %%ecx, (%%"REG_a") \n\t" "movl %%ecx, (%%"REG_a") \n\t"
"4: \n\t" "4: \n\t"
"add %6, %%eax \n\t" "add %7, %%eax \n\t"
"shr $2, %%eax \n\t" "shr $2, %%eax \n\t"
"movl %%esi, %a8(%3) \n\t" "movl %%esi, %a9(%4) \n\t"
"movl %%ebx, %a9(%3) \n\t" "movl %3, %a10(%4) \n\t"
:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index) :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
"=&r"(low)
:"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, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream)) "i"(offsetof(CABACContext, bytestream))
: "%"REG_c, "%ebx", "%edx", "%esi", "memory" : "%"REG_c, "%edx", "%esi", "memory"
); );
return coeff_count; return coeff_count;
} }
@ -99,31 +101,32 @@ static int decode_significance_8x8_x86(CABACContext *c,
int *index, x86_reg last_off, const uint8_t *sig_off){ int *index, x86_reg last_off, const uint8_t *sig_off){
int minusindex= 4-(int)index; int minusindex= 4-(int)index;
int coeff_count; int coeff_count;
int low;
x86_reg last=0; x86_reg last=0;
__asm__ volatile( __asm__ volatile(
"movl %a8(%3), %%esi \n\t" "movl %a9(%4), %%esi \n\t"
"movl %a9(%3), %%ebx \n\t" "movl %a10(%4), %3 \n\t"
"mov %1, %%"REG_D" \n\t" "mov %1, %%"REG_D" \n\t"
"2: \n\t" "2: \n\t"
"mov %6, %%"REG_a" \n\t" "mov %7, %%"REG_a" \n\t"
"movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t" "movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t"
"add %5, %%"REG_D" \n\t" "add %6, %%"REG_D" \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", BRANCHLESS_GET_CABAC("%%edx", "%4", "(%%"REG_D")", "%3",
"%%bx", "%%esi", "%%eax", "%%al", "%a10") "%w3", "%%esi", "%%eax", "%%al", "%a11")
"mov %1, %%edi \n\t" "mov %1, %%edi \n\t"
"test $1, %%edx \n\t" "test $1, %%edx \n\t"
" jz 3f \n\t" " jz 3f \n\t"
"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t" "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
"add %5, %%"REG_D" \n\t" "add %6, %%"REG_D" \n\t"
"add %7, %%"REG_D" \n\t" "add %8, %%"REG_D" \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", BRANCHLESS_GET_CABAC("%%edx", "%4", "(%%"REG_D")", "%3",
"%%bx", "%%esi", "%%eax", "%%al", "%a10") "%w3", "%%esi", "%%eax", "%%al", "%a11")
"mov %2, %%"REG_a" \n\t" "mov %2, %%"REG_a" \n\t"
"mov %1, %%edi \n\t" "mov %1, %%edi \n\t"
@ -143,20 +146,19 @@ static int decode_significance_8x8_x86(CABACContext *c,
"mov %2, %%"REG_a" \n\t" "mov %2, %%"REG_a" \n\t"
"movl %%edi, (%%"REG_a") \n\t" "movl %%edi, (%%"REG_a") \n\t"
"4: \n\t" "4: \n\t"
"addl %4, %%eax \n\t" "addl %5, %%eax \n\t"
"shr $2, %%eax \n\t" "shr $2, %%eax \n\t"
"movl %%esi, %a8(%3) \n\t" "movl %%esi, %a9(%4) \n\t"
"movl %%ebx, %a9(%3) \n\t" "movl %3, %a10(%4) \n\t"
:"=&a"(coeff_count),"+m"(last), "+m"(index) :"=&a"(coeff_count),"+m"(last), "+m"(index), "=&r"(low)
:"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, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream)) "i"(offsetof(CABACContext, bytestream))
: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory" : "%"REG_c, "%edx", "%esi", "%"REG_D, "memory"
); );
return coeff_count; return coeff_count;
} }
#endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */ #endif /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
/* !defined(BROKEN_RELOCATIONS) */
#endif /* AVCODEC_X86_H264_I386_H */ #endif /* AVCODEC_X86_H264_I386_H */