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vp9: remove one optimization branch in iadst16 which causes overflows.
See sample vp90-2-14-resize-fp-tiles-16-8-4-2-1.webm from the vp9 test vector set which reproduces the issue. This probably costs a few cycles, but I don't think there's an easy way to workaround that. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -1699,7 +1699,9 @@ VP9_IDCT_IDCT_16x16_ADD_XMM avx
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SUMSUB_BA w, 5, 7, 4
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PSIGNW m5, [pw_m1] ; m12=out15[w], m8=t3[w]
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%if cpuflag(ssse3)
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; unfortunately, the code below overflows in some cases, e.g.
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; http://downloads.webmproject.org/test_data/libvpx/vp90-2-14-resize-fp-tiles-16-8-4-2-1.webm
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%if 0 ; cpuflag(ssse3)
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SUMSUB_BA w, 7, 6, 4
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pmulhrsw m7, [pw_m11585x2] ; m8=out7[w]
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pmulhrsw m6, [pw_11585x2] ; m1=out8[w]
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