simplify-rtx.x (simplify_subreg): When constructing a CONST_VECTOR from individual...

	* simplify-rtx.x (simplify_subreg): When constructing a CONST_VECTOR
	from individual subregs, check that each subreg has been generated
	sucessfully.

From-SVN: r55686

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 90bf680..36d45ca 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+Tue Jul 23 20:56:03 2002  J"orn Rennecke <joern.rennecke@superh.com>
+
+       * simplify-rtx.x (simplify_subreg): When constructing a CONST_VECTOR
+       from individual subregs, check that each subreg has been generated
+       sucessfully.
+
 2002-07-23  Neil Booth  <neil@daikokuya.co.uk>
 
        * genautomata.c (VLA_HWINT_SHORTEN, VLA_HWINT_LAST): Remove.

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index c69084f..d07de68 100644 (file)
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -2367,10 +2367,17 @@ simplify_subreg (outermode, op, innermode, byte)
          int subsize = GET_MODE_UNIT_SIZE (outermode);
          int i, elts = GET_MODE_NUNITS (outermode);
          rtvec v = rtvec_alloc (elts);
+         rtx elt;
 
          for (i = 0; i < elts; i++, byte += subsize)
            {
-             RTVEC_ELT (v, i) = simplify_subreg (submode, op, innermode, byte);
+             /* This might fail, e.g. if taking a subreg from a SYMBOL_REF.  */
+             /* ??? It would be nice if we could actually make such subregs
+                on targets that allow such relocations.  */
+             elt = simplify_subreg (submode, op, innermode, byte);
+             if (! elt)
+               return NULL_RTX;
+             RTVEC_ELT (v, i) = elt;
            }
          return gen_rtx_CONST_VECTOR (outermode, v);
        }