diff options
Diffstat (limited to 'libavcodec/x86/pngdsp.asm')
| -rw-r--r-- | libavcodec/x86/pngdsp.asm | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/libavcodec/x86/pngdsp.asm b/libavcodec/x86/pngdsp.asm index bff76e0c0d..8c4cb19da0 100644 --- a/libavcodec/x86/pngdsp.asm +++ b/libavcodec/x86/pngdsp.asm @@ -2,6 +2,7 @@ ;* 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. ;* @@ -100,6 +101,12 @@ cglobal add_png_paeth_prediction, 5, 7, %1, dst, src, top, w, bpp, end, cntr 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 @@ -152,7 +159,12 @@ cglobal add_png_paeth_prediction, 5, 7, %1, dst, src, top, w, bpp, end, cntr add dstq, bppq cmp dstq, endq jle .loop - REP_RET + + mov dstq, [rsp] + dec cntrq + jge .bpp_loop + POP dstq + RET %endmacro INIT_MMX mmx2 |