re PR tree-optimization/63259 (Detecting byteswap sequence)

re PR tree-optimization/63259 (Detecting byteswap sequence)

2014-10-31  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    gcc/
    PR tree-optimization/63259
    * tree-ssa-math-opts.c (bswap_replace): Replace expression by a
    rotation left if it is a 16 bit byte swap.
    (pass_optimize_bswap::execute): Also consider bswap in LROTATE_EXPR
    and RROTATE_EXPR statements if it is a byte rotation.

    gcc/testsuite/
    PR tree-optimization/63259
    * optimize-bswapsi-1.c (swap32_f): New bswap pass test.
    * optimize-bswaphi-1.c: Drop useless SIType definition and fix typo in
    following comment.

From-SVN: r216971