Re: [PATCH, i386]: Implement post-reload vzeroupper insertion pass

[Uros Bizjak <ubizjak at gmail dot com>]

On Sun, Nov 11, 2012 at 9:45 PM, Uros Bizjak <ubizjak@gmail.com> wrote:
>
>> Regarding vzeroupper insertion pass - we will use gcc pass manager to
>> insert a target-dependant pass directly after reload ...
>
> ... like attached patch. The patch inserts vzeroupper pass directly
> after reload, so spills from 256bit registers are considered when
> processing AVX_U128 entity. The patched gcc reruns mode-switching
> pass, so an export of entry function from mode-switching is needed.

2012-11-14  Uros Bizjak  <ubizjak@gmail.com>
            Vladimir Yakovlev  <vladimir.b.yakovlev@intel.com>

        PR target/47440
        * config/i386/i386.c (gate_insert_vzeroupper): New function.
        (rest_of_handle_insert_vzeroupper): Ditto.
        (struct rtl_opt_pass pass_insert_vzeroupper): New.
        (ix86_option_override): Register vzeroupper insertion pass here.
        (ix86_check_avx256_register): Handle SUBREGs properly.
        (ix86_init_machine_status): Remove optimize_mode_switching[AVX_U128]
        initialization.

Bootstrapped and regression tested on x86_64-pc-linux-gnu {,-m32} AVX
target and committed to mainline SVN.

Uros.

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