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avcodec/mips: cabac.h provide fallback for wsbh instruction 

wsbh is only avilable for MIPS R2+.
Provide a fallback for older processors.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Shiyou Yin <yinshiyou-hf@loongson.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Jiaxun Yang 2021-07-23 13:53:44 +08:00 committed by Michael Niedermayer
parent a1cd62883f
commit 2323d3a923
1 changed files with 24 additions and 0 deletions
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24
libavcodec/mips/cabac.h
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@ -77,7 +77,15 @@ static av_always_inline int get_cabac_inline_mips(CABACContext *c,
"lhu %[tmp0], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp0], 0(%[c_bytestream]) \n\t"
#if HAVE_MIPS32R2 || HAVE_MIPS64R2
"wsbh %[tmp0], %[tmp0] \n\t"
#else
"and %[tmp1], %[tmp0], 0xff00ff00 \n\t"
"srl %[tmp1], %[tmp1], 8 \n\t"
"and %[tmp0], %[tmp0], 0x00ff00ff \n\t"
"sll %[tmp0], %[tmp0], 8 \n\t"
"or %[tmp0], %[tmp0], %[tmp1] \n\t"
#endif
#endif
PTR_SLL "%[tmp0], %[tmp0], 0x01 \n\t"
PTR_SUBU "%[tmp0], %[tmp0], %[cabac_mask] \n\t"
@ -125,7 +133,15 @@ static av_always_inline int get_cabac_bypass_mips(CABACContext *c)
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#if HAVE_MIPS32R2 || HAVE_MIPS64R2
"wsbh %[tmp1], %[tmp1] \n\t"
#else
"and %[tmp0], %[tmp1], 0xff00ff00 \n\t"
"srl %[tmp0], %[tmp0], 8 \n\t"
"and %[tmp1], %[tmp1], 0x00ff00ff \n\t"
"sll %[tmp1], %[tmp1], 8 \n\t"
"or %[tmp1], %[tmp1], %[tmp0] \n\t"
#endif
#endif
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[cabac_mask] \n\t"
@ -169,7 +185,15 @@ static av_always_inline int get_cabac_bypass_sign_mips(CABACContext *c, int val)
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#else
"lhu %[tmp1], 0(%[c_bytestream]) \n\t"
#if HAVE_MIPS32R2 || HAVE_MIPS64R2
"wsbh %[tmp1], %[tmp1] \n\t"
#else
"and %[tmp0], %[tmp1], 0xff00ff00 \n\t"
"srl %[tmp0], %[tmp0], 8 \n\t"
"and %[tmp1], %[tmp1], 0x00ff00ff \n\t"
"sll %[tmp1], %[tmp1], 8 \n\t"
"or %[tmp1], %[tmp1], %[tmp0] \n\t"
#endif
#endif
PTR_SLL "%[tmp1], %[tmp1], 0x01 \n\t"
PTR_SUBU "%[tmp1], %[tmp1], %[cabac_mask] \n\t"