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x86: cabac: replace explicit memory references with "m" operands

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This replaces the explicit offset(reg) memory references with
"m" operands for the same locations.  As a result, one fewer
register operand is needed for these inline asm statements.

Signed-off-by: Mans Rullgard <mans@mansr.com>
pull/2/head
Mans Rullgard 13 years ago
parent b11ce85664
commit 599b4c6efd
2 changed files with 36 additions and 40 deletions
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  1. 45
      libavcodec/x86/cabac.h
  2. 31
      libavcodec/x86/h264_i386.h

45
libavcodec/x86/cabac.h
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@ -27,7 +27,7 @@
#include "config.h"
#if HAVE_FAST_CMOV
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\
#define BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, lowword, range, tmp)\
"mov "tmp" , %%ecx \n\t"\
"shl $17 , "tmp" \n\t"\
"cmp "low" , "tmp" \n\t"\
@ -37,7 +37,7 @@
"xor %%ecx , "ret" \n\t"\
"sub "tmp" , "low" \n\t"
#else /* HAVE_FAST_CMOV */
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\
#define BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, lowword, range, tmp)\
"mov "tmp" , %%ecx \n\t"\
"shl $17 , "tmp" \n\t"\
"sub "low" , "tmp" \n\t"\
@ -51,14 +51,13 @@
"xor "tmp" , "ret" \n\t"
#endif /* HAVE_FAST_CMOV */
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte, byte) \
#define BRANCHLESS_GET_CABAC(ret, statep, low, lowword, range, tmp, tmpbyte, byte) \
"movzbl "statep" , "ret" \n\t"\
"mov "range" , "tmp" \n\t"\
"and $0xC0 , "range" \n\t"\
"movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\
"sub "range" , "tmp" \n\t"\
BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, \
range, tmp) \
BRANCHLESS_GET_CABAC_UPDATE(ret, statep, low, lowword, range, tmp) \
"movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\
"shl %%cl , "range" \n\t"\
"movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\
@ -66,8 +65,8 @@
"mov "tmpbyte" , "statep" \n\t"\
"test "lowword" , "lowword" \n\t"\
" jnz 1f \n\t"\
"mov "byte"("cabac"), %%"REG_c" \n\t"\
"add"OPSIZE" $2 , "byte "("cabac") \n\t"\
"mov "byte" , %%"REG_c" \n\t"\
"add"OPSIZE" $2 , "byte" \n\t"\
"movzwl (%%"REG_c") , "tmp" \n\t"\
"lea -1("low") , %%ecx \n\t"\
"xor "low" , %%ecx \n\t"\
@ -82,7 +81,7 @@
"add "tmp" , "low" \n\t"\
"1: \n\t"
#if HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
#if HAVE_6REGS && !defined(BROKEN_RELOCATIONS)
#define get_cabac_inline get_cabac_inline_x86
static av_always_inline int get_cabac_inline_x86(CABACContext *c,
uint8_t *const state)
@ -90,24 +89,24 @@ static av_always_inline int get_cabac_inline_x86(CABACContext *c,
int bit, tmp;
__asm__ volatile(
BRANCHLESS_GET_CABAC("%0", "%5", "(%4)", "%1", "%w1", "%2",
"%3", "%b3", "%a6")
:"=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp)
:"r"(state), "r"(c),
"i"(offsetof(CABACContext, bytestream))
BRANCHLESS_GET_CABAC("%0", "(%5)", "%1", "%w1", "%2",
"%3", "%b3", "%4")
:"=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp),
"+m"(c->bytestream)
:"r"(state)
: "%"REG_c, "memory"
);
return bit & 1;
}
#endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
#endif /* HAVE_6REGS && !defined(BROKEN_RELOCATIONS) */
#define get_cabac_bypass_sign get_cabac_bypass_sign_x86
static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
{
x86_reg tmp;
__asm__ volatile(
"movl %a3(%2), %k1 \n\t"
"movl %a4(%2), %%eax \n\t"
"movl %4, %k1 \n\t"
"movl %2, %%eax \n\t"
"shl $17, %k1 \n\t"
"add %%eax, %%eax \n\t"
"sub %k1, %%eax \n\t"
@ -118,22 +117,20 @@ static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
"sub %%edx, %%ecx \n\t"
"test %%ax, %%ax \n\t"
" jnz 1f \n\t"
"mov %a5(%2), %1 \n\t"
"mov %3, %1 \n\t"
"subl $0xFFFF, %%eax \n\t"
"movzwl (%1), %%edx \n\t"
"bswap %%edx \n\t"
"shrl $15, %%edx \n\t"
"add $2, %1 \n\t"
"addl %%edx, %%eax \n\t"
"mov %1, %a5(%2) \n\t"
"mov %1, %3 \n\t"
"1: \n\t"
"movl %%eax, %a4(%2) \n\t"
"movl %%eax, %2 \n\t"
:"+c"(val), "=&r"(tmp)
:"r"(c),
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
"i"(offsetof(CABACContext, bytestream))
: "%eax", "%edx", "memory"
:"+c"(val), "=&r"(tmp), "+m"(c->low), "+m"(c->bytestream)
:"m"(c->range)
: "%eax", "%edx"
);
return val;
}

31
libavcodec/x86/h264_i386.h
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@ -36,7 +36,7 @@
//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
//as that would make optimization work hard)
#if HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
#if HAVE_6REGS && !defined(BROKEN_RELOCATIONS)
static int decode_significance_x86(CABACContext *c, int max_coeff,
uint8_t *significant_coeff_ctx_base,
int *index, x86_reg last_off){
@ -48,15 +48,15 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
__asm__ volatile(
"2: \n\t"
BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
"%w3", "%5", "%k0", "%b0", "%a11")
BRANCHLESS_GET_CABAC("%4", "(%1)", "%3",
"%w3", "%5", "%k0", "%b0", "%6")
"test $1, %4 \n\t"
" jz 3f \n\t"
"add %10, %1 \n\t"
BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
"%w3", "%5", "%k0", "%b0", "%a11")
BRANCHLESS_GET_CABAC("%4", "(%1)", "%3",
"%w3", "%5", "%k0", "%b0", "%6")
"sub %10, %1 \n\t"
"mov %2, %0 \n\t"
@ -81,9 +81,9 @@ static int decode_significance_x86(CABACContext *c, int max_coeff,
"add %9, %k0 \n\t"
"shr $2, %k0 \n\t"
:"=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
"+&r"(c->low), "=&r"(bit), "+&r"(c->range)
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
"i"(offsetof(CABACContext, bytestream))
"+&r"(c->low), "=&r"(bit), "+&r"(c->range),
"+m"(c->bytestream)
:"m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off)
: "%"REG_c, "memory"
);
return coeff_count;
@ -105,8 +105,8 @@ static int decode_significance_8x8_x86(CABACContext *c,
"movzbl (%0, %6), %k6 \n\t"
"add %9, %6 \n\t"
BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
"%w3", "%5", "%k0", "%b0", "%a12")
BRANCHLESS_GET_CABAC("%4", "(%6)", "%3",
"%w3", "%5", "%k0", "%b0", "%7")
"mov %1, %k6 \n\t"
"test $1, %4 \n\t"
@ -115,8 +115,8 @@ static int decode_significance_8x8_x86(CABACContext *c,
"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%k6), %k6\n\t"
"add %11, %6 \n\t"
BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
"%w3", "%5", "%k0", "%b0", "%a12")
BRANCHLESS_GET_CABAC("%4", "(%6)", "%3",
"%w3", "%5", "%k0", "%b0", "%7")
"mov %2, %0 \n\t"
"mov %1, %k6 \n\t"
@ -138,13 +138,12 @@ static int decode_significance_8x8_x86(CABACContext *c,
"addl %8, %k0 \n\t"
"shr $2, %k0 \n\t"
:"=&q"(coeff_count),"+m"(last), "+m"(index), "+&r"(c->low), "=&r"(bit),
"+&r"(c->range), "=&r"(state)
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_coeff_ctx_base),
"i"(offsetof(CABACContext, bytestream))
"+&r"(c->range), "=&r"(state), "+m"(c->bytestream)
:"m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_coeff_ctx_base)
: "%"REG_c, "memory"
);
return coeff_count;
}
#endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
#endif /* HAVE_6REGS && !defined(BROKEN_RELOCATIONS) */
#endif /* AVCODEC_X86_H264_I386_H */

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