[Bug rtl-optimization/54300] [4.7, 4.8 Regression] regcprop incorrectly looks through parallel register swap operation

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54300

--- Comment #15 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Mon Dec  9 14:54:00 2013
New Revision: 205807

URL: http://gcc.gnu.org/viewcvs?rev=205807&root=gcc&view=rev
Log:
    PR rtl-optimization/54300

gcc/

    PR rtl-optimization/54300
    * regcprop.c (copyprop_hardreg_forward_1): Ensure any unused
    outputs in a single-set are killed from the value chains.

gcc/testsuite:

    PR rtl-optimization/54300
    * gcc.target/arm/pr54300.C: New test.


Added:
    trunk/gcc/testsuite/gcc.target/arm/ldrd-strd-offset.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/arm/arm.c
    trunk/gcc/testsuite/ChangeLog