[PATCH, i386 tests] New tests to check vectorization for AVX2 insns.

[Kirill Yukhin]

Hello guys,
Here is a bunch of tests which check basic vectorization abilities to
generate AVX2 instructions.

testsuite/ChangeLog entry is:
2011-10-14  Kirill Yukhin  <kirill.yukhin@intel.com>

        * gcc.target/i386/avx2-vpaddd-3.c: New test.
        * gcc.target/i386/avx2-vpaddw-3.c: Ditto.
        * gcc.target/i386/avx2-vpaddb-3.c: New.
        * gcc.target/i386/avx2-vpaddq-3.c: Ditto.
        * gcc.target/i386/avx2-vpand-3.c: Ditto.
        * gcc.target/i386/avx2-vpmulld-3.c: Ditto.
        * gcc.target/i386/avx2-vpmullw-3.c: Ditto.
        * gcc.target/i386/avx2-vpsrad-3.c: Ditto.
        * gcc.target/i386/avx2-vpsraw-3.c: Ditto.
        * gcc.target/i386/avx2-vpsrld-3.c: Ditto.
        * gcc.target/i386/avx2-vpsrlw-3.c: Ditto.
        * gcc.target/i386/avx2-vpsubb-3.c: Ditto.
        * gcc.target/i386/avx2-vpsubd-3.c: Ditto.
        * gcc.target/i386/avx2-vpsubq-3.c: Ditto.
        * gcc.target/i386/avx2-vpsubw-3.c: Ditto.

Could you please have a look?

Thanks, K
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