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[PATCH, debug]: Fix PR 54177, Segfault in cselib_lookup due to NULL_RTX passed from vt_add_function_parameter

From: Uros Bizjak <ubizjak at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Alexandre Oliva <aoliva at redhat dot com>
Date: Tue, 7 Aug 2012 23:07:12 +0200
Subject: [PATCH, debug]: Fix PR 54177, Segfault in cselib_lookup due to NULL_RTX passed from vt_add_function_parameter

Hello!

We can exit early from var_lowpart for matched modes. This avoids
situation, where var_lowpart tries to change

(gdb) p debug_rtx (incoming)
(concat:SC (reg:SF 48 $f16 [ x ])
    (reg:SF 49 $f17 [ x+4 ]))
$1 = void

to SCmode, and returning NULL_RTX, since the RTX is neither REG, neither MEM.

2012-08-07  Uros Bizjak  <ubizjak@gmail.com>

	PR debug/54177
	* var-tracking.c (var_lowpart): Exit early for matched modes.

Tested on x86_64-pc-linux-gnu {,-m32} and alphaev68-unknown-linux-gnu,
where the patch also fixes testsuite failure.

Patch was approved in the PR by Alexandre, and is committed to mainline SVN.

Uros.

Attachment: v.diff.txt
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