Also introduce -m[no-]mmxfp-with-sse option to disable trapping V2SF
named patterns in order to avoid generation of partial vector V4SFmode
trapping instructions.

The new option is enabled by default, because even with sanitization,
a small but consistent speed up of 2 to 3% with Polyhedron capacita
benchmark can be achieved vs. scalar code.

Using -fno-trapping-math improves Polyhedron capacita runtime 8 to 9%
vs. scalar code.  This is what clang does by default, as it defaults
to -fno-trapping-math.

    PR target/110832

gcc/ChangeLog:

    * config/i386/i386.h (TARGET_MMXFP_WITH_SSE): New macro.
    * config/i386/i386/opt (mmmxfp-with-sse): New option.
    * config/i386/mmx.md (movq_<mode>_to_sse): Do not sanitize
    upper part of V2SFmode register with -fno-trapping-math.
    (<plusminusmult:insn>v2sf3): Enable for TARGET_MMXFP_WITH_SSE.
    (divv2sf3): Ditto.
    (<smaxmin:code>v2sf3): Ditto.
    (sqrtv2sf2): Ditto.
    (*mmx_haddv2sf3_low): Ditto.
    (*mmx_hsubv2sf3_low): Ditto.
    (vec_addsubv2sf3): Ditto.
    (vec_cmpv2sfv2si): Ditto.
    (vcond<V2FI:mode>v2sf): Ditto.
    (fmav2sf4): Ditto.
    (fmsv2sf4): Ditto.
    (fnmav2sf4): Ditto.
    (fnmsv2sf4): Ditto.
    (fix_truncv2sfv2si2): Ditto.
    (fixuns_truncv2sfv2si2): Ditto.
    (floatv2siv2sf2): Ditto.
    (floatunsv2siv2sf2): Ditto.
    (nearbyintv2sf2): Ditto.
    (rintv2sf2): Ditto.
    (lrintv2sfv2si2): Ditto.
    (ceilv2sf2): Ditto.
    (lceilv2sfv2si2): Ditto.
    (floorv2sf2): Ditto.
    (lfloorv2sfv2si2): Ditto.
    (btruncv2sf2): Ditto.
    (roundv2sf2): Ditto.
    (lroundv2sfv2si2): Ditto.

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

Uros.