[Bug tree-optimization/68238] Vector cost model overestimates prologue cost for SLPed code

[jgreenhalgh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68238

--- Comment #2 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
Author: jgreenhalgh
Date: Tue Nov 10 10:08:03 2015
New Revision: 230092

URL: https://gcc.gnu.org/viewcvs?rev=230092&root=gcc&view=rev
Log:
[Patch GCC 5/Vect] Partial backport of r228751 (pr68238)

gcc/

        Partial backport from trunk r228751.
        PR tree-optimization/68238
        2015-10-13  Richard Biener  <rguent...@suse.de>

        * tree-vect-loop.c (vect_estimate_min_profitable_iters): Use
        LOOP_VINFO_COMP_ALIAS_DDRS to estimate alias versioning cost.


Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/tree-vect-loop.c