[PING ARM Patches] PR53447: optimizations of 64bit ALU operation with constant

[Michael Hope]

On 18 June 2012 22:17, Carrot Wei <carrot@google.com> wrote:
> Hi
>
> Could ARM maintainers review following patches?
>
> http://gcc.gnu.org/ml/gcc-patches/2012-06/msg00497.html
> 64bit add/sub constants.
>
> http://gcc.gnu.org/ml/gcc-patches/2012-05/msg01834.html
> 64bit and with constants.
>
> http://gcc.gnu.org/ml/gcc-patches/2012-05/msg01974.html
> 64bit xor with constants.
>
> http://gcc.gnu.org/ml/gcc-patches/2012-06/msg00287.html
> 64bit ior with constants.

Hi Carrot.  Out of interest, how do these interact with the 64 bit in
NEON patches that Andrew has been doing?  They seem to touch many of
the same patterns and I'm concerned that they'd cause GCC to prefer
core registers instead of NEON, especially as the constant values you
can use in a vmov are limited.

There's a (in progress) summary of the current state for the standard
C operators here:
 https://wiki.linaro.org/MichaelHope/Sandbox/64BitOperations

-- Michael