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Bug#618799: libvigraimpex: unacceptably slow on mips

For a reason on another the attached program[0] is disturbingly slow on gabrielli.debian.org. It takes 74 seconds to run it; even my qemu mips machine (600 bogomips) is ca. 10 times faster.

Dear mips porters:
- Could you test speed of the program on other mips hardware?
- Do you have any ideas what could be the cause of such a bad efficiency?

[0] To compile it, you need to have libvigraimpex-dev installed, but no special compiler flags are needed.

Jakub Wilk
#include <vigra/stdimage.hxx>
#include <vigra/boundarytensor.hxx>

int main(int argc, char **argv)
    vigra::DImage img(200, 300);
    vigra::DVector3Image bt(img.size());
    boundaryTensor1(srcImageRange(img), destImage(bt), 2.0);

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