Hello!

This ICE was caused by a peephole2 pattern that allowed non-general
regs arguments.

2015-07-08  Uros Bizjak  <ubizjak@gmail.com>

    PR target/66814
    * config/i386/predicates.md (nonimmediate_gr_operand): New predicate.
    * config/i386/i386.md (not peephole2): Use nonimmediate_gr_operand.
    (varous peephole2s): Use {GENERAL,SSE,MMX}_REGNO_P instead of
    {GENERAL_SSE_MMX}_REG_P where appropriate.

testsuite/ChangeLog:

2015-07-09  Uros Bizjak  <ubizjak@gmail.com>

    PR target/66814
    * gcc.target/i386/pr66814.c: New test.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN, will be backported to gcc-5, when the branch opens.

Uros.