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

["gregory.0xf0 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

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

gregory.0xf0 at gmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |gregory.0xf0 at gmail dot com

--- Comment #19 from gregory.0xf0 at gmail dot com ---
(In reply to Richard Earnshaw from comment #15)
> 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

There probably isn't much that can be done to fix this now, but in case anyone
else was confused because this change was tagged with PR 54300, it looks like
this change ended up with the wrong commit message (changelog is correct). 
FMI: https://gcc.gnu.org/ml/gcc-patches/2013-12/msg00850.html
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/62300] [5 Regression] internal compiler error: in as_a, at is-a.h:192
Date: Fri, 29 Aug 2014 03:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idb300

--- Comment #5 from dmalcolm at gcc dot gnu.org ---
Author: dmalcolm
Date: Fri Aug 29 03:12:01 2014
New Revision: 214714

URL: https://gcc.gnu.org/viewcvs?rev!4714&root=gcc&view=rev
Log:
    PR bootstrap/62300
    * function.c (assign_parm_setup_reg): Remove erroneous checked
    cast to rtx_insn * on result of gen_extend_insn in favor of
    introducing a new local rtx "pat".


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/function.c