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- ;******************************************************************************
- ;* x86 optimizations for PNG decoding
- ;*
- ;* Copyright (c) 2008 Loren Merritt <lorenm@u.washington.edu>
- ;* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
- ;*
- ;* This file is part of Libav.
- ;*
- ;* Libav is free software; you can redistribute it and/or
- ;* modify it under the terms of the GNU Lesser General Public
- ;* License as published by the Free Software Foundation; either
- ;* version 2.1 of the License, or (at your option) any later version.
- ;*
- ;* Libav is distributed in the hope that it will be useful,
- ;* but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- ;* Lesser General Public License for more details.
- ;*
- ;* You should have received a copy of the GNU Lesser General Public
- ;* License along with Libav; if not, write to the Free Software
- ;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- ;******************************************************************************
-
- %include "libavutil/x86/x86util.asm"
-
- SECTION_RODATA
-
- cextern pw_255
-
- SECTION .text
-
- ; %1 = nr. of xmm registers used
- %macro ADD_BYTES_FN 1
- cglobal add_bytes_l2, 4, 6, %1, dst, src1, src2, wa, w, i
- %if ARCH_X86_64
- movsxd waq, wad
- %endif
- xor iq, iq
-
- ; vector loop
- mov wq, waq
- and waq, ~(mmsize*2-1)
- jmp .end_v
- .loop_v:
- mova m0, [src1q+iq]
- mova m1, [src1q+iq+mmsize]
- paddb m0, [src2q+iq]
- paddb m1, [src2q+iq+mmsize]
- mova [dstq+iq ], m0
- mova [dstq+iq+mmsize], m1
- add iq, mmsize*2
- .end_v:
- cmp iq, waq
- jl .loop_v
-
- %if mmsize == 16
- ; vector loop
- mov waq, wq
- and waq, ~7
- jmp .end_l
- .loop_l:
- movq mm0, [src1q+iq]
- paddb mm0, [src2q+iq]
- movq [dstq+iq ], mm0
- add iq, 8
- .end_l:
- cmp iq, waq
- jl .loop_l
- %endif
-
- ; scalar loop for leftover
- jmp .end_s
- .loop_s:
- mov wab, [src1q+iq]
- add wab, [src2q+iq]
- mov [dstq+iq], wab
- inc iq
- .end_s:
- cmp iq, wq
- jl .loop_s
- REP_RET
- %endmacro
-
- %if ARCH_X86_32
- INIT_MMX mmx
- ADD_BYTES_FN 0
- %endif
-
- INIT_XMM sse2
- ADD_BYTES_FN 2
-
- %macro ADD_PAETH_PRED_FN 1
- cglobal add_png_paeth_prediction, 5, 7, %1, dst, src, top, w, bpp, end, cntr
- %if ARCH_X86_64
- movsxd bppq, bppd
- movsxd wq, wd
- %endif
- lea endq, [dstq+wq-(mmsize/2-1)]
- sub topq, dstq
- sub srcq, dstq
- sub dstq, bppq
- pxor m7, m7
-
- PUSH dstq
- lea cntrq, [bppq-1]
- shr cntrq, 2 + mmsize/16
- .bpp_loop:
- lea dstq, [dstq+cntrq*(mmsize/2)]
- movh m0, [dstq]
- movh m1, [topq+dstq]
- punpcklbw m0, m7
- punpcklbw m1, m7
- add dstq, bppq
- .loop:
- mova m2, m1
- movh m1, [topq+dstq]
- mova m3, m2
- punpcklbw m1, m7
- mova m4, m2
- psubw m3, m1
- psubw m4, m0
- mova m5, m3
- paddw m5, m4
- %if cpuflag(ssse3)
- pabsw m3, m3
- pabsw m4, m4
- pabsw m5, m5
- %else ; !cpuflag(ssse3)
- psubw m7, m5
- pmaxsw m5, m7
- pxor m6, m6
- pxor m7, m7
- psubw m6, m3
- psubw m7, m4
- pmaxsw m3, m6
- pmaxsw m4, m7
- pxor m7, m7
- %endif ; cpuflag(ssse3)
- mova m6, m4
- pminsw m6, m5
- pcmpgtw m3, m6
- pcmpgtw m4, m5
- mova m6, m4
- pand m4, m3
- pandn m6, m3
- pandn m3, m0
- movh m0, [srcq+dstq]
- pand m6, m1
- pand m2, m4
- punpcklbw m0, m7
- paddw m0, m6
- paddw m3, m2
- paddw m0, m3
- pand m0, [pw_255]
- mova m3, m0
- packuswb m3, m3
- movh [dstq], m3
- add dstq, bppq
- cmp dstq, endq
- jle .loop
-
- mov dstq, [rsp]
- dec cntrq
- jge .bpp_loop
- POP dstq
- RET
- %endmacro
-
- INIT_MMX mmxext
- ADD_PAETH_PRED_FN 0
-
- INIT_MMX ssse3
- ADD_PAETH_PRED_FN 0
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