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