- ctx->D[0] = Yo[3] - last[3];
- ctx->D[1] = Yo[3 + oYstride] - Yo[3];
- ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
- ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
+ ctx->D[0] = (unsigned)Yo[3] - last[3];
+ ctx->D[1] = (unsigned)Yo[3 + oYstride] - Yo[3];
+ ctx->D[2] = (unsigned)Yo[3 + oYstride * 2] - Yo[3 + oYstride];
+ ctx->D[3] = (unsigned)Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];