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Check for NULL_RTX in gen_highpart
- From: Craig Rodrigues <rodrigc at mediaone dot net>
- To: gcc-patches at gcc dot gnu dot org
- Date: Sun, 6 Jan 2002 12:59:11 -0500
- Subject: Check for NULL_RTX in gen_highpart
Hi,
The following testcase was submitted in PR 5279.
It causes gcc 3.0.3 to ICE, and mainline to segfault.
This patch does not solve the PR, but it causes mainline
to ICE instead of segfault, since simplify_gen_subreg
can return NULL_RTX.
2002-01-06 Craig Rodrigues <rodrigc@gcc.gnu.org>
* emit-rtl.c (gen_highpart): Add check for NULL_RTX.
Index: emit-rtl.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/emit-rtl.c,v
retrieving revision 1.241
diff -u -r1.241 emit-rtl.c
--- emit-rtl.c 2002/01/01 22:22:25 1.241
+++ emit-rtl.c 2002/01/06 17:52:26
@@ -1200,7 +1200,7 @@
/* simplify_gen_subreg is not guaranteed to return a valid operand for
the target if we have a MEM. gen_highpart must return a valid operand,
emitting code if necessary to do so. */
- if (GET_CODE (result) == MEM)
+ if (result != NULL_RTX && GET_CODE (result) == MEM)
result = validize_mem (result);
if (!result)
--
Craig Rodrigues
http://www.gis.net/~craigr
rodrigc@mediaone.net