[Bug target/37096] conditional evaluation incorrect with -O3

[ubizjak at gmail dot com]

------- Comment #8 from ubizjak at gmail dot com  2008-09-11 18:16 -------
Hm, with -O2 -fno-strict-aliasing, it works fine.

Is there an aliasing issue involved?

short Transform4x4(short *pMatrix)
{
        __m128i r4, r5;

        __m128i r0 = _mm_loadl_epi64((__m128i *)(pMatrix + 0 * 16));
        __m128i r1 = _mm_loadl_epi64((__m128i *)(pMatrix + 1 * 16));
        __m128i r2 = _mm_loadl_epi64((__m128i *)(pMatrix + 2 * 16));
        __m128i r3 = _mm_loadl_epi64((__m128i *)(pMatrix + 3 * 16));

        ... stuff ...

        _mm_storel_epi64((__m128i *)(pMatrix + 0 * 16), r0);
        _mm_storel_epi64((__m128i *)(pMatrix + 1 * 16), r1);
        _mm_storel_epi64((__m128i *)(pMatrix + 2 * 16), r2);
        _mm_storel_epi64((__m128i *)(pMatrix + 3 * 16), r3);

}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37096