[ARM] Factor out the thumb2 -Os implementation.

[Marcus Shawcroft]

On 16/11/15 16:28, Marcus Shawcroft wrote:
> This patch moves the inline ASM thumb2 -Os implementation out into its
> own .S file.
>
> Tested by building newlib and comparing libc.a binaries before and
> after for all permutations of:
>
>        Architectures:
>          armv4 armv4t armv5 armv5t armv5te armv6 armv6j armv6k
>          armv6z armv6kz armv6t2 armv6-m armv6s-m armv7 armv7-a
>          armv7ve armv7-r armv7-m armv7e-m armv8-a iwmmxt iwmmxt2
>
>        ISAs:
>          thumb arm
>
>        Optimization Levels:
>          Os O2
>
>        Excluding:
>          armv6s-m -mthumb
>          armv6-m -mthumb
>
>          armv6zk -mthumb
>          armv6z -mthumb
>          armv6k -mthumb
>          armv6j -mthumb
>
> OK?
> /Marcus
>
>         * libc/machine/arm/strlen-stub.c: Move T2 -O2 implementation to...
>         * libc/machine/arm/strlen-thumb2-Os.S: New file.
>         * libc/machine/arm/strlen.S: Include strlen-thumb2-Os.S.


Hi, Here is a re-spin.  This version provides a .arch directive for 
either armv6t2 or armv7 depending on the target architecture rather than 
assuming armv6t2 is always fine.

OK?

/M

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