[PATCH][x86] Match movss and movsd "blend" instructions

[Allan Sandfeld Jensen]

Updated:

Match movss and movsd "blend" instructions

Adds the ability to match movss and movsd as blend patterns,
implemented in a new method to be able to match these before shuffles,
while keeping other blends after.

2018-08-11 Allan Sandfeld Jensen <allan.jensen@qt.io>

gcc/config/i386

    * i386.cc (expand_vec_perm_movs): New method matching movs
    patterns.
    * i386.cc (expand_vec_perm_1): Try the new method.

gcc/testsuite

    * gcc.target/i386/sse2-movs.c: New test.
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