Merge lp:~uweigand/gcc-linaro/neon-extendsidi-4.7-v4 into lp:gcc-linaro/4.7

[Ulrich Weigand]

Better optimize SI->DI extends that move from core to NEON registers.

This is a backport of the following GCC mainline patches:

http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00984.html
http://gcc.gnu.org/ml/gcc-patches/2012-10/msg00053.html
http://gcc.gnu.org/ml/gcc-patches/2012-09/msg01764.html

[Linaro Toolchain Builder (cbuild)]

cbuild has taken a snapshot of this branch at r115041 and queued it for build.

The diff against the ancestor r115040 is available at:
 http://cbuild.validation.linaro.org/snapshots/gcc-linaro-4.7+bzr115041~uweigand~neon-extendsidi-4.7-v4.diff

and will be built on the following builders:
 a9-builder a9hf-builder armv5-builder i686 x86_64 xaarch64 xaarch64_bare xcortexa15hf

You can track the build queue at:
 http://cbuild.validation.linaro.org/helpers/scheduler

cbuild-snapshot: gcc-linaro-4.7+bzr115041~uweigand~neon-extendsidi-4.7-v4
cbuild-ancestor: lp:gcc-linaro+bzr115040
cbuild-state: check

[Yvan Roux (yvan-roux)]

* Diff matches upstream
* Approved beside the pending testsuite results (results were check in the previous request).

review: Approve