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fd8b90f5f6
Also disable the mmx/iwht optimization when the bitexact flag is set. With synthetically coded coefficients (i.e. these that lead to a residual well outside the [-255,255] range), our optimizations will overflow. It doesn't make sense to fix the overflows, since they can only occur on synthetic input, not on real fwht-generated input. Thus, add a bitexact flag that disables this optimization.