mmintrin.h: New file.

mmintrin.h: New file.

        * config/i386/mmintrin.h: New file.
        * config/i386/xmmintrin.h: New file.
        * config.gcc (i?86-*-*): Add extra_headers.
        * simplify-rtx.c (simplify_unary_operation): Handle saturating
        truncation codes.
        (simplify_binary_operation): Handle saturating arithmetic codes.
        * config/i386/i386.c (ix86_expand_sse_comi): Return the full result,
        not the lowpart subreg.
        (ix86_expand_builtin): Return a TImode dummy register instead of 0
        on error.
        * config/i386/i386.md (mmx_clrdi): Override memory attribute.

        * gcc.dg/i386-mmx-1.c, gcc.dg/i386-mmx-2.c: New.
        * gcc.dg/i386-sse-1.c, gcc.dg/i386-sse-2.c, gcc.dg/i386-sse-1.c: New.
CVs: ----------------------------------------------------------------------

From-SVN: r48793