[Bug target/59601] New: [4.9 Regression] __attribute__ ((target("arch=corei7"))) won't match Westmere processor

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59601

            Bug ID: 59601
           Summary: [4.9 Regression] __attribute__
                    ((target("arch=corei7"))) won't match Westmere
                    processor
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: ubizjak at gmail dot com

g++.dg/ext/mv1.C fails on Westmere processor at run-time
since -march=westmere wasn't supported befor and now
__attribute__ ((target("arch=corei7"))) is turned into
__attribute__ ((target("arch=nehalem"))) which won't match
Westmere at run-time.  We have 2 choices:

1. No change.  __attribute__ ((target("arch=corei7"))) won't
match Westmere and function won't be optimized for Westmere.
2. Make PROCESSOR_NEHALEM to match "corei7" for function
versioning. But __attribute__ ((target("arch=nehalem"))) function
may be used on Westmere.  I think it is OK since function
versioning doesn't support extra ISAs on Westmere.