Wrong memory access at cv::Mat::at (Bug #1527)

The code below

#include <cmath>
#include <iostream>
#include <opencv2\core\core.hpp>

int main(int argc, char **argv)
{
    cv::Mat res( 200, 200, CV_32FC3, cv::Scalar(0, 0, 0) );
    res.at<cv::Vec3f>(100, 100) = cv::Vec3f(-9.1f, -9.1f, -9.1f);

    cv::Vec3f &color( res.at<cv::Vec3f>(100, 100) );

    int t1( cvRound(std::exp( color.valr0 ) * 10) );
    int t2( cvRound(std::exp( color.valr1 ) * 10) );
    int t3( cvRound(std::exp( color.valr2 ) * 10) );

    std::cout << colorr0 << "," << colorr1 << "," << colorr2 << std::endl;
    std::cout << t1 << "," << t2 << "," << t3 << std::endl;

    return 0;
}

outputs

-9.1,-9.1,-9.1
0,0,10

but should

-9.1,-9.1,-9.1
0,0,0

The bug is present in Visual Studio 2010 (Win32, Console application, "Release" configuration, Floating point model: fast).

The bug is not present in "Floating point model: precise", or when optimization is turned off.

Examination of assembly code showed that last memory access (color.valr2) goes into neighboring (right) pixel, which is zero. So I get 10 instead of 0 for t3.