Index: simplify-rtx.c
===================================================================
--- simplify-rtx.c	(revision 195931)
+++ simplify-rtx.c	(working copy)
@@ -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))
Index: testsuite/gcc.dg/pr56275.c
===================================================================
--- testsuite/gcc.dg/pr56275.c	(revision 0)
+++ testsuite/gcc.dg/pr56275.c	(working copy)
@@ -0,0 +1,12 @@
+/* { 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;
+}