Re: [PATCH 1/4] match.pd: Add x + (x & 1) -> (x + 1) & ~1 pattern

[Jeff Law]

On 01/21/2015 03:49 AM, Rasmus Villemoes wrote:
gcc.dg/20150120-1.c: New test
Rounding an integer to the next even integer is sometimes written x +=
x & 1. The equivalent x = (x+1)&~1 usually uses one less register, and
in practical cases only the new value of x will be used (making it
unlikely that the subexpression x&1 has any uses).

I bootstrapped and regression tested this on x86_64-linux-gnu, created 
the appropriate ChangeLogs and installed the patch on the trunk.

Jeff