re PR rtl-optimization/56275 (ICE in simplify_subreg, at simplify-rtx.c:5261 with vector code.)

	PR rtl-optimization/56275
	* simplify-rtx.c (avoid_constant_pool_reference): Check that
	offset is non-negative and less than cmode size before
	calling simplify_subreg.

testsuite/ChangeLog:

	PR rtl-optimization/56275
	* gcc.dg/pr56275.c: New test.

From-SVN: r195944

gcc/ChangeLog

+2013-02-11  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR rtl-optimization/56275
+	* simplify-rtx.c (avoid_constant_pool_reference): Check that
+	offset is non-negative and less than cmode size before
+	calling simplify_subreg.
+
 2013-02-11  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/56264

gcc/simplify-rtx.c

@@ -242,7 +242,8 @@ avoid_constant_pool_reference (rtx x)
       /* If we're accessing the constant in a different mode than it was
          originally stored, attempt to fix that up via subreg simplifications.
          If that fails we have no choice but to return the original memory.  */
-      if (offset != 0 || cmode != GET_MODE (x))
+      if ((offset != 0 || cmode != GET_MODE (x))
+	  && offset >= 0 && offset < GET_MODE_SIZE (cmode))
         {
           rtx tem = simplify_subreg (GET_MODE (x), c, cmode, offset);
           if (tem && CONSTANT_P (tem))

gcc/testsuite/ChangeLog

+2013-02-11  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR rtl-optimization/56275
+	* gcc.dg/pr56275.c: New test.
+
 2013-02-11  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/56273

gcc/testsuite/gcc.dg/pr56275.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-mno-sse" { target { i?86-*-* x86_64-*-* } } } */
+
+typedef long long v2tw __attribute__ ((vector_size (2 * sizeof (long long))));
+
+void tiger_block_v2 (long long in1, v2tw *res)
+{
+  v2tw i1 = { in1, in1 };
+
+  *res = i1 << 1;
+}