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h264_i386: Optimize decode_significance_8x8_x86 for 64 bit.

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11674 -> 10877 decicycles on my Phenom II.
Overall speedup was unfortunately within measurement error.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2014-11-15 18:10:53 +01:00
parent c2c27e9e51
commit 478c61ccb2
1 changed files with 18 additions and 12 deletions
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30
libavcodec/x86/h264_i386.h
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@ -36,6 +36,12 @@
#if HAVE_INLINE_ASM
#if ARCH_X86_64
#define REG64 "r"
#else
#define REG64 "m"
#endif
//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
//as that would make optimization work hard)
#if HAVE_7REGS && !BROKEN_COMPILER
@ -140,7 +146,7 @@ static int decode_significance_8x8_x86(CABACContext *c,
"3: \n\t"
"mov %10, %0 \n\t"
"movzbl (%0, %6), %k6 \n\t"
"movzb (%0, %6), %6 \n\t"
"add %9, %6 \n\t"
BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
@ -151,14 +157,14 @@ static int decode_significance_8x8_x86(CABACContext *c,
AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
"%15")
"mov %1, %k6 \n\t"
"mov %1, %6 \n\t"
"test $1, %4 \n\t"
" jz 4f \n\t"
#ifdef BROKEN_RELOCATIONS
"movzbl %c14(%15, %q6), %k6\n\t"
"movzb %c14(%15, %q6), %6\n\t"
#else
"movzbl "MANGLE(ff_h264_cabac_tables)"+%c14(%k6), %k6\n\t"
"movzb "MANGLE(ff_h264_cabac_tables)"+%c14(%6), %6\n\t"
#endif
"add %11, %6 \n\t"
@ -171,8 +177,8 @@ static int decode_significance_8x8_x86(CABACContext *c,
"%15")
"mov %2, %0 \n\t"
"mov %1, %k6 \n\t"
"movl %k6, (%0) \n\t"
"mov %1, %6 \n\t"
"mov %6, (%0) \n\t"
"test $1, %4 \n\t"
" jnz 5f \n\t"
@ -180,19 +186,19 @@ static int decode_significance_8x8_x86(CABACContext *c,
"add"OPSIZE" $4, %2 \n\t"
"4: \n\t"
"addl $1, %k6 \n\t"
"mov %k6, %1 \n\t"
"cmpl $63, %k6 \n\t"
"add $1, %6 \n\t"
"mov %6, %1 \n\t"
"cmp $63, %6 \n\t"
" jb 3b \n\t"
"mov %2, %0 \n\t"
"movl %k6, (%0) \n\t"
"mov %6, (%0) \n\t"
"5: \n\t"
"addl %8, %k0 \n\t"
"shr $2, %k0 \n\t"
: "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),
: "=&q"(coeff_count), "+"REG64(last), "+"REG64(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),
REG64(sig_off), REG64(last_coeff_ctx_base),
"i"(offsetof(CABACContext, bytestream)),
"i"(offsetof(CABACContext, bytestream_end)),
"i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG