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[PATCH]: Backport fix for PR41963 (miscompilation of 177.mesa)

Hello!

2009-11-07 Uros Bizjak <ubizjak@gmail.com>

    Backport from mainline:
    2009-11-06  Michael Matz <matz@suse.de>

    PR middle-end/41963
    * tree-ssa-math-opts.c (execute_cse_reciprocals): Check all uses
    of a potential reciprocal to really be reciprocals.

testsuite/ChangeLog:

2009-11-07 Uros Bizjak <ubizjak@gmail.com>

    Backport from mainline:
    2009-11-06  Michael Matz <matz@suse.de>

    PR middle-end/41963
    * gcc.target/i386/pr41963.c: New test.

Since this transformation is still activated by -mrecip only in the release branches, I have moved the test to i386 target directory, where this option can be activated.

Patch was tested on x86_64-pc-linux-gnu. OK for 4.4 and 4.3 ?

Uros.

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