[PATCH, ARM] Unaligned accesses for packed structures [1/2]

[Julian Brown]

On Mon, 9 May 2011 18:01:12 +0100
Julian Brown <julian@codesourcery.com> wrote:

> How does this look now? (Re-testing in progress.)

The previously-posted version contained a bug in the "extv" expander,
which became apparent only when testing together with my fixed-point
support patch. This is a corrected version.

Re-tested (together with the followup unaligned-memcpy patch and
fixed-point patch series), with no regressions in both big &
little-endian mode, cross to ARM EABI.

OK to apply this version?

Thanks,

Julian

ChangeLog

    gcc/
    * config/arm/arm.c (arm_override_options): Add unaligned_access
    support.
    (arm_file_start): Emit attribute for unaligned access as
    appropriate.
    * config/arm/arm.md (UNSPEC_UNALIGNED_LOAD)
    (UNSPEC_UNALIGNED_STORE): Add constants for unspecs.
    (insv, extzv): Add unaligned-access support.
    (extv): Change to expander. Likewise.
    (unaligned_loadsi, unaligned_loadhis, unaligned_loadhiu)
    (unaligned_storesi, unaligned_storehi): New.
    (*extv_reg): New (previous extv implementation).
    * config/arm/arm.opt (munaligned_access): Add option.
    * config/arm/constraints.md (Uw): New constraint.
    * expmed.c (store_bit_field_1): Don't tweak bitfield numbering for
    memory locations if BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN.
    (extract_bit_field_1): Likewise.
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