PR target/19511

    PR target/19511
        * config/i386/i386.c (ix86_preferred_reload_class): Return a proper
        subclass of the input class.
        (ix86_secondary_memory_needed): Always true for cross-MMX classes.
        Always true for cross-SSE1 classes.  Rationalize conditionals.
        * config/i386/i386.h (SSE_CLASS_P, MMX_CLASS_P): Use straight equality.
        * config/i386/i386.md (movsi_1): Add MMX/SSE zeros.  Fix alternatives
        for SSE1.  Don't check TARGET_INTER_UNIT_MOVES.
        (movdi_2): Add MMX/SSE zeros.
        (movdi_1_rex64): Likewise.  Don't check TARGET_INTER_UNIT_MOVES.
        (movsf_1): Don't check TARGET_INTER_UNIT_MOVES.
        (zero_extendsidi2_32, zero_extendsidi2_rex64): Likewise.
        (movsi_1_nointernunit, movdi_1_rex64_nointerunit): Remove.
        (movsf_1_nointerunit, zero_extendsidi2_32_1): Remove.
        (zero_extendsidi2_rex64_1): Remove.
        (MOV0 peephole): Check GENERAL_REG_P.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@93948 138bc75d-0d04-0410-961f-82ee72b054a4