From: Jan Hubicka <jh@suse.cz>
Date: Thu, 17 May 2001 17:40:48 +0000 (+0200)
Subject: * simplify-rtx.c  (simplify_subreg): Avoid creating of incorrect subregs.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8f7785933c54f04b205d43351907d2b1c93eea9a;p=gcc.git

* simplify-rtx.c  (simplify_subreg): Avoid creating of incorrect subregs.

From-SVN: r42212
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b256242e0ee..4087617124c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Thu May 17 19:40:03 CEST 2001  Jan Hubicka  <jh@suse.cz>
+
+	* simplify-rtx.c  (simplify_subreg): Avoid creating of incorrect subregs.
+
 2001-05-17  Bernd Schmidt  <bernds@redhat.com>
 
 	* expr.c (protect_from_queue): Protect against subsequent calls to
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 44cfc3b7e32..fd1b6303768 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -2331,6 +2331,10 @@ simplify_subreg (outermode, op, innermode, byte)
 			       % UNITS_PER_WORD));
 	}
 
+      /* Bail out in case resulting subreg would be incorrect.  */
+      if (final_offset % GET_MODE_SIZE (outermode)
+	  || final_offset >= GET_MODE_SIZE (innermostmode))
+	return NULL;
       /* Recurse for futher possible simplifications.  */
       new = simplify_subreg (outermode, SUBREG_REG (op),
 			     GET_MODE (SUBREG_REG (op)),