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Fix for SSE2 intrinsics problem in the part of saturation arithmetic processing during 32s->16u packed conversion -

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for some big negative values less than -INT_MAX+32767 the sign of the numbers is lost due to overflow that leads to
incorrect saturation to MAX value, instead of zero.
The issue is not reproduced with CV_ENABLED_INTRINSICS=OFF
This commit is contained in:
amatyuko
2018-07-31 21:54:15 +03:00
parent 9433784e47
commit 3ea2586a5a
2 changed files with 9 additions and 4 deletions
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modules/core/src/convert.cpp
+3 -3
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@@ -453,9 +453,9 @@ struct Cvt_SIMD<int, uchar>
{
v_int32x4 v_src1 = v_load(src + x), v_src2 = v_load(src + x + cWidth);
v_int32x4 v_src3 = v_load(src + x + cWidth * 2), v_src4 = v_load(src + x + cWidth * 3);
v_uint16x8 v_dst1 = v_pack_u(v_src1, v_src2);
v_uint16x8 v_dst2 = v_pack_u(v_src3, v_src4);
v_store(dst + x, v_pack(v_dst1, v_dst2));
v_int16x8 v_dst1 = v_pack(v_src1, v_src2);
v_int16x8 v_dst2 = v_pack(v_src3, v_src4);
v_store(dst + x, v_pack_u(v_dst1, v_dst2));
}
}
return x;