re PR target/51681 (ICE in gcc.dg/torture/vshuf-v2si.c on ia64)

	PR target/51681
	* config/ia64/ia64.c (expand_vec_perm_shrp): Use correct operands
	for shrp pattern.  Correctly handle and fixup shift variable.
	Return false when shift > nelt for BYTES_BIG_ENDIAN target.

From-SVN: r182931

gcc/ChangeLog

+2012-01-05  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/51681
+	* config/ia64/ia64.c (expand_vec_perm_shrp): Use correct operands
+	for shrp pattern.  Correctly handle and fixup shift variable.
+	Return false when shift > nelt for BYTES_BIG_ENDIAN target.
+
 2012-01-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/51762
@@ -42,8 +49,7 @@
 2012-01-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/51761
-	* gimple.h (struct gimplify_ctx): Add in_cleanup_point_expr
-	field.
+	* gimple.h (struct gimplify_ctx): Add in_cleanup_point_expr field.
 	* gimplify.c (gimplify_cleanup_point_expr): Save and set
 	in_cleanup_point_expr before gimplify_stmt call and restore it
 	afterwards.
@@ -183,17 +189,15 @@
 	PR tree-optimization/49651
 	* tree-ssa-structalias.c (type_can_have_subvars): New function.
 	(var_can_have_subvars): Use it.
-	(get_constraint_for_1): Only consider subfields if there
-	can be any.
+	(get_constraint_for_1): Only consider subfields if there can be any.
 
 2012-01-03  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/51725
-	* cselib.c (new_elt_loc_list): When moving locs from one
-	cselib_val to its new canonical_cselib_val and the
-	cselib_val was in first_containing_mem chain, but
-	the canonical_cselib_val was not, add the latter into the
-	chain.
+	* cselib.c (new_elt_loc_list): When moving locs from one cselib_val
+	to its new canonical_cselib_val and the cselib_val was in
+	first_containing_mem chain, but the canonical_cselib_val was not,
+	add the latter into the chain.
 	(cselib_invalidate_mem): Compare canonical_cselib_val of
 	addr_list chain elt with v.
 

gcc/config/ia64/ia64.c

@@ -11085,7 +11085,7 @@ static bool
 expand_vec_perm_shrp (struct expand_vec_perm_d *d)
 {
   unsigned i, nelt = d->nelt, shift, mask;
-  rtx tmp, op0, op1;;
+  rtx tmp, hi, lo;
 
   /* ??? Don't force V2SFmode into the integer registers.  */
   if (d->vmode == V2SFmode)
@@ -11094,6 +11094,9 @@ expand_vec_perm_shrp (struct expand_vec_perm_d *d)
   mask = (d->one_operand_p ? nelt - 1 : 2 * nelt - 1);
 
   shift = d->perm[0];
+  if (BYTES_BIG_ENDIAN && shift > nelt)
+    return false;
+
   for (i = 1; i < nelt; ++i)
     if (d->perm[i] != ((shift + i) & mask))
       return false;
@@ -11101,6 +11104,11 @@ expand_vec_perm_shrp (struct expand_vec_perm_d *d)
   if (d->testing_p)
     return true;
 
+  hi = shift < nelt ? d->op1 : d->op0;
+  lo = shift < nelt ? d->op0 : d->op1;
+
+  shift %= nelt;
+
   shift *= GET_MODE_UNIT_SIZE (d->vmode) * BITS_PER_UNIT;
 
   /* We've eliminated the shift 0 case via expand_vec_perm_identity.  */
@@ -11113,11 +11121,9 @@ expand_vec_perm_shrp (struct expand_vec_perm_d *d)
     shift = 64 - shift;
 
   tmp = gen_reg_rtx (DImode);
-  op0 = (shift < nelt ? d->op0 : d->op1);
-  op1 = (shift < nelt ? d->op1 : d->op0);
-  op0 = gen_lowpart (DImode, op0);
-  op1 = gen_lowpart (DImode, op1);
-  emit_insn (gen_shrp (tmp, op0, op1, GEN_INT (shift)));
+  hi = gen_lowpart (DImode, hi);
+  lo = gen_lowpart (DImode, lo);
+  emit_insn (gen_shrp (tmp, hi, lo, GEN_INT (shift)));
 
   emit_move_insn (d->target, gen_lowpart (d->vmode, tmp));
   return true;