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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 "x86inc.asm"
%include "x86util.asm"
SECTION_RODATA
cextern pw_255
section .text align=16
; %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 mmx2
ADD_PAETH_PRED_FN 0
INIT_MMX ssse3
ADD_PAETH_PRED_FN 0
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