[PATCH] Fix PR64088

[Richard Biener]

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.

Richard.

2014-11-27  Richard Biener  <rguent...@suse.de>

        PR middle-end/64088
        * fold-const.c (const_unop): Re-instantiate missing condition
        before calling fold_abs_const.

        * gcc.dg/torture/pr64088.c: New testcase.

Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c    (revision 218121)
+++ gcc/fold-const.c    (working copy)
@@ -1481,7 +1489,9 @@ const_unop (enum tree_code code, tree ty
       }
 
     case ABS_EXPR:
-      return fold_abs_const (arg0, type);
+      if (TREE_CODE (arg0) == INTEGER_CST || TREE_CODE (arg0) == REAL_CST)
+       return fold_abs_const (arg0, type);
+      break;
 
     case CONJ_EXPR:
       if (TREE_CODE (arg0) == COMPLEX_CST)
Index: gcc/testsuite/gcc.dg/torture/pr64088.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr64088.c      (revision 0)
+++ gcc/testsuite/gcc.dg/torture/pr64088.c      (working copy)
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+
+extern int abs (int);
+extern void attenuate_curve(int*);
+int a;
+void
+setup_tone_curves_center_boost ()
+{
+  int b[0];
+  a = 0;
+  for (; a < 6; a++)
+    {
+      int c = abs (a);
+      b[a] = c;
+    }
+  attenuate_curve (b);
+}