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avcodec/mips: Refine get_cabac_inline_mips. 

1. Refined function get_cabac_inline_mips.
2. Optimize function get_cabac_bypass and get_cabac_bypass_sign.

Speed of decoding h264: 4.89x ==> 5.05x(tested on 3A4000).

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Shiyou Yin 2021-04-12 23:37:02 +08:00 committed by Michael Niedermayer
parent 56c57fe68a
commit 5ab8e8bc92
1 changed files with 112 additions and 28 deletions
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140
libavcodec/mips/cabac.h
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@ -2,7 +2,8 @@
* Loongson SIMD optimized h264chroma
*
* Copyright (c) 2018 Loongson Technology Corporation Limited
* Copyright (c) 2018 Shiyou Yin <yinshiyou-hf@loongson.cn>
* Contributed by Shiyou Yin <yinshiyou-hf@loongson.cn>
* Gu Xiwei(guxiwei-hf@loongson.cn)
*
* This file is part of FFmpeg.
*
@ -26,18 +27,18 @@
#include "libavutil/attributes.h"
#include "libavcodec/cabac.h"
#include "libavutil/mips/asmdefs.h"
#include "libavutil/mips/mmiutils.h"
#include "config.h"
#define get_cabac_inline get_cabac_inline_mips
static av_always_inline int get_cabac_inline_mips(CABACContext *c,
uint8_t * const state){
uint8_t * const state){
mips_reg tmp0, tmp1, tmp2, bit;
__asm__ volatile (
"lbu %[bit], 0(%[state]) \n\t"
"and %[tmp0], %[c_range], 0xC0 \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tmp0] \n\t"
PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[bit] \n\t"
/* tmp1: RangeLPS */
@ -45,18 +46,11 @@ static av_always_inline int get_cabac_inline_mips(CABACContext *c,
PTR_SUBU "%[c_range], %[c_range], %[tmp1] \n\t"
PTR_SLL "%[tmp0], %[c_range], 0x11 \n\t"
PTR_SUBU "%[tmp0], %[tmp0], %[c_low] \n\t"
/* tmp2: lps_mask */
PTR_SRA "%[tmp2], %[tmp0], 0x1F \n\t"
/* If tmp0 < 0, lps_mask == 0xffffffff*/
/* If tmp0 >= 0, lps_mask == 0x00000000*/
"slt %[tmp2], %[tmp0], %[c_low] \n\t"
"beqz %[tmp2], 1f \n\t"
PTR_SLL "%[tmp0], %[c_range], 0x11 \n\t"
"move %[c_range], %[tmp1] \n\t"
"not %[bit], %[bit] \n\t"
PTR_SUBU "%[c_low], %[c_low], %[tmp0] \n\t"
PTR_SUBU "%[tmp0], %[tmp1], %[c_range] \n\t"
PTR_ADDU "%[c_range], %[c_range], %[tmp0] \n\t"
"xor %[bit], %[bit], %[tmp2] \n\t"
"1: \n\t"
/* tmp1: *state */
@ -71,23 +65,21 @@ static av_always_inline int get_cabac_inline_mips(CABACContext *c,
PTR_SLL "%[c_range], %[c_range], %[tmp2] \n\t"
PTR_SLL "%[c_low], %[c_low], %[tmp2] \n\t"
"and %[tmp0], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp0], 1f \n\t"
PTR_ADDIU "%[tmp0], %[c_low], -0x01 \n\t"
"and %[tmp1], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp1], 1f \n\t"
PTR_ADDIU "%[tmp0], %[c_low], -0X01 \n\t"
"xor %[tmp0], %[c_low], %[tmp0] \n\t"
PTR_SRA "%[tmp0], %[tmp0], 0x0f \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tables] \n\t"
/* tmp2: ff_h264_norm_shift[x >> (CABAC_BITS - 1)] */
"lbu %[tmp2], %[norm_off](%[tmp0]) \n\t"
#if CABAC_BITS == 16
"lbu %[tmp0], 0(%[c_bytestream]) \n\t"
"lbu %[tmp1], 1(%[c_bytestream]) \n\t"
PTR_SLL "%[tmp0], %[tmp0], 0x09 \n\t"
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_ADDU "%[tmp0], %[tmp0], %[tmp1] \n\t"
#if HAVE_BIGENDIAN
"lhu %[tmp0], 0(%[c_bytestream]) \n\t"
#else
"lbu %[tmp0], 0(%[c_bytestream]) \n\t"
PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
"lhu %[tmp0], 0(%[c_bytestream]) \n\t"
"wsbh %[tmp0], %[tmp0] \n\t"
#endif
PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
PTR_SUBU "%[tmp0], %[tmp0], %[cabac_mask] \n\t"
"li %[tmp1], 0x07 \n\t"
@ -95,10 +87,13 @@ static av_always_inline int get_cabac_inline_mips(CABACContext *c,
PTR_SLL "%[tmp0], %[tmp0], %[tmp1] \n\t"
PTR_ADDU "%[c_low], %[c_low], %[tmp0] \n\t"
#if !UNCHECKED_BITSTREAM_READER
"bge %[c_bytestream], %[c_bytestream_end], 1f \n\t"
#if UNCHECKED_BITSTREAM_READER
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0x02 \n\t"
#else
"slt %[tmp0], %[c_bytestream], %[c_bytestream_end] \n\t"
PTR_ADDIU "%[tmp2], %[c_bytestream], 0x02 \n\t"
"movn %[c_bytestream], %[tmp2], %[tmp0] \n\t"
#endif
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0X02 \n\t"
"1: \n\t"
: [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [tmp2]"=&r"(tmp2),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
@ -117,4 +112,93 @@ static av_always_inline int get_cabac_inline_mips(CABACContext *c,
return bit;
}
#define get_cabac_bypass get_cabac_bypass_mips
static av_always_inline int get_cabac_bypass_mips(CABACContext *c)
{
mips_reg tmp0, tmp1;
int res = 0;
__asm__ volatile(
PTR_SLL "%[c_low], %[c_low], 0x01 \n\t"
"and %[tmp0], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp0], 1f \n\t"
#if HAVE_BIGENDIAN
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
"wsbh %[tmp1], %[tmp1] \n\t"
#endif
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[cabac_mask] \n\t"
PTR_ADDU "%[c_low], %[c_low], %[tmp1] \n\t"
#if UNCHECKED_BITSTREAM_READER
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0x02 \n\t"
#else
"slt %[tmp0], %[c_bytestream], %[c_bytestream_end] \n\t"
PTR_ADDIU "%[tmp1], %[c_bytestream], 0x02 \n\t"
"movn %[c_bytestream], %[tmp1], %[tmp0] \n\t"
#endif
"1: \n\t"
PTR_SLL "%[tmp1], %[c_range], 0x11 \n\t"
"slt %[tmp0], %[c_low], %[tmp1] \n\t"
PTR_SUBU "%[tmp1], %[c_low], %[tmp1] \n\t"
"movz %[res], %[one], %[tmp0] \n\t"
"movz %[c_low], %[tmp1], %[tmp0] \n\t"
: [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [res]"+&r"(res),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
[c_bytestream]"+&r"(c->bytestream)
: [cabac_mask]"r"(CABAC_MASK),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[one]"r"(0x01)
: "memory"
);
return res;
}
#define get_cabac_bypass_sign get_cabac_bypass_sign_mips
static av_always_inline int get_cabac_bypass_sign_mips(CABACContext *c, int val)
{
mips_reg tmp0, tmp1;
int res = val;
__asm__ volatile(
PTR_SLL "%[c_low], %[c_low], 0x01 \n\t"
"and %[tmp0], %[c_low], %[cabac_mask] \n\t"
"bnez %[tmp0], 1f \n\t"
#if HAVE_BIGENDIAN
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
"wsbh %[tmp1], %[tmp1] \n\t"
#endif
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[cabac_mask] \n\t"
PTR_ADDU "%[c_low], %[c_low], %[tmp1] \n\t"
#if UNCHECKED_BITSTREAM_READER
PTR_ADDIU "%[c_bytestream], %[c_bytestream], 0x02 \n\t"
#else
"slt %[tmp0], %[c_bytestream], %[c_bytestream_end] \n\t"
PTR_ADDIU "%[tmp1], %[c_bytestream], 0x02 \n\t"
"movn %[c_bytestream], %[tmp1], %[tmp0] \n\t"
#endif
"1: \n\t"
PTR_SLL "%[tmp1], %[c_range], 0x11 \n\t"
"slt %[tmp0], %[c_low], %[tmp1] \n\t"
PTR_SUBU "%[tmp1], %[c_low], %[tmp1] \n\t"
"movz %[c_low], %[tmp1], %[tmp0] \n\t"
PTR_SUBU "%[tmp1], %[zero], %[res] \n\t"
"movn %[res], %[tmp1], %[tmp0] \n\t"
: [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [res]"+&r"(res),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low),
[c_bytestream]"+&r"(c->bytestream)
: [cabac_mask]"r"(CABAC_MASK),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[zero]"r"(0x0)
: "memory"
);
return res;
}
#endif /* AVCODEC_MIPS_CABAC_H */