http://gcc.gnu.org/ml/gcc-patches/2011-03/msg02172.html

The last version:

ChangeLog:

     * doc/invoke.texi (preferred-vector-size): Document.
     * params.h (PREFERRED_VECTOR_SIZE): Define.
     * config/arm/arm.c (arm_preferred_simd_mode): Use param
     PREFERRED_VECTOR_SIZE instead of
     TARGET_NEON_VECTORIZE_QUAD. Make 128 bits the default.
     (arm_autovectorize_vector_sizes): Likewise.
     * config/arm/arm.opt (NEON_VECTORIZE_QUAD): Add
     RejectNegative.
     * params.def (PARAM_PREFERRED_VECTOR_SIZE): Define.

testsuite/ChangeLog:

     * lib/target-supports.exp (check_effective_target_vect_multiple_sizes):
     New procedure.
     (add_options_for_quad_vectors): Replace with ...
     (add_options_for_double_vectors): ... this.
     * gfortran.dg/vect/pr19049.f90: Expect more printings on targets that
     support multiple vector sizes since the vectorizer attempts to
     vectorize with both vector sizes.
     * gcc.dg/vect/slp-reduc-6.c, gcc.dg/vect/no-vfa-vect-79.c,
     gcc.dg/vect/no-vfa-vect-102a.c, gcc.dg/vect/vect-outer-1a.c,
     gcc.dg/vect/vect-outer-1b.c, gcc.dg/vect/vect-outer-2b.c,
     gcc.dg/vect/vect-outer-3a.c, gcc.dg/vect/no-vfa-vect-37.c,
     gcc.dg/vect/vect-outer-3b.c, gcc.dg/vect/no-vfa-vect-101.c,
     gcc.dg/vect/no-vfa-vect-102.c, gcc.dg/vect/vect-reduc-dot-s8b.c,
     gcc.dg/vect/vect-outer-1.c, gcc.dg/vect/vect-104.c: Likewise.
     * gcc.dg/vect/vect-16.c: Rename to...
     * gcc.dg/vect/no-fast-math-vect-16.c: ... this to ensure that it runs
     without -ffast-math.
     * gcc.dg/vect/vect-42.c: Run with 64 bit vectors if applicable.
     * gcc.dg/vect/vect-multitypes-6.c, gcc.dg/vect/vect-52.c,
     gcc.dg/vect/vect-54.c, gcc.dg/vect/vect-46.c, gcc.dg/vect/vect-48.c,
     gcc.dg/vect/vect-96.c, gcc.dg/vect/vect-multitypes-3.c,
     gcc.dg/vect/vect-40.c: Likewise.
     * gcc.dg/vect/vect-outer-5.c: Remove quad-vectors option as
     redundant.
     * gcc.dg/vect/vect-109.c, gcc.dg/vect/vect-peel-1.c,
     gcc.dg/vect/vect-peel-2.c, gcc.dg/vect/slp-25.c,
     gcc.dg/vect/vect-multitypes-1.c, gcc.dg/vect/slp-3.c,
     gcc.dg/vect/no-vfa-pr29145.c, gcc.dg/vect/vect-multitypes-4.c:
     Likewise.
     * gcc.dg/vect/vect.exp: Run no-fast-math-vect*.c tests with
     -fno-fast-math.

Thanks,
Ira