[PATCH] Fix i686 memchr for large input sizes

[Siddhesh Poyarekar]

On Monday 02 January 2017 07:56 PM, Adhemerval Zanella wrote:
> Similar to BZ#19387 and BZ#20971, both i686 memchr optimized assembly
> implementations (memchr-sse2-bsf and memchr-sse2) do not handle the
> size overflow correctly.
> 
> It is shown by the new tests added by commit 3daef2c8ee4df29, where
> both implementation fails with size as SIZE_MAX.
> 
> This patch uses a similar strategy used on 3daef2c8ee4df2, where
> saturared math is used for overflow case.
> 
> Checked on i686-linux-gnu.
> 
> 	[BZ #21014]
> 	* sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S (MEMCHR): Avoid overflow
> 	in pointer addition.
> 	* sysdeps/i386/i686/multiarch/memchr-sse2.S (MEMCHR): Likewise.

Looks good to me.

Siddhesh