RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-02-06 06:44:29 +00:00
Code Issues Projects Releases Wiki Activity

vp9: disable all pmulhrsw in 8/16 iadst x86 optimizations.

Browse Source 
They all overflow in various samples that are considered valid input.
This commit is contained in:
Ronald S. Bultje 2015-05-14 13:39:37 -04:00
parent cf31e2df08
commit 96d30c3495
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libavcodec/x86/vp9itxfm.asm
View File

@ -868,7 +868,8 @@ VP9_IDCT_IDCT_8x8_ADD_XMM avx, 13
; m6=out0, m5=out1, m4=t2, m3=t3, m7=t6, m0=t7, m2=out6, m1=out7
%if cpuflag(ssse3)
; unfortunately, the code below overflows in some cases
%if 0; cpuflag(ssse3)
SUMSUB_BA w, 3, 4, 2
SUMSUB_BA w, 0, 7, 2
pmulhrsw m3, W_11585x2_REG
@ -1647,7 +1648,8 @@ VP9_IDCT_IDCT_16x16_ADD_XMM avx
VP9_RND_SH_SUMSUB_BA 4, 7, 0, 2, 1, [pd_8192]
PSIGNW m4, [pw_m1] ; m4=out13[w], m7=t15[w]
%if cpuflag(ssse3)
; unfortunately, the code below overflows in some cases
%if 0; cpuflag(ssse3)
SUMSUB_BA w, 7, 6, 1
pmulhrsw m7, [pw_m11585x2] ; m7=out5[w]
pmulhrsw m6, [pw_11585x2] ; m6=out10[w]