[PATCH] Fix optimize_range_tests_var_bound (PR tree-optimization/77901)

[Jakub Jelinek]

Hi!

I forgot to take into account that ranges[i].exp might not be just NULL or
SSA_NAME, but it can be e.g. BIT_AND_EXPR etc. when optimized by earlier
optimize_range_tests* optimizations.  We only care about SSA_NAMEs or the
a < b comparisons that can be ranges[i].exp == NULL if they are in
GIMPLE_COND.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2016-10-08  Jakub Jelinek  <ja...@redhat.com>

        PR tree-optimization/77901
        * tree-ssa-reassoc.c (optimize_range_tests_var_bound): Only optimize
        if ranges[i].exp is SSA_NAME when looking for >= and only when
        ranges[i].exp is NULL or SSA_NAME when looking for the other
        comparison.

        * gcc.c-torture/compile/pr77901.c: New test.

--- gcc/tree-ssa-reassoc.c.jj   2016-10-07 11:32:51.000000000 +0200
+++ gcc/tree-ssa-reassoc.c      2016-10-08 18:01:32.773394195 +0200
@@ -2846,7 +2846,9 @@ optimize_range_tests_var_bound (enum tre
 
   for (i = first; i < length; i++)
     {
-      if (ranges[i].exp == NULL_TREE || !ranges[i].in_p)
+      if (ranges[i].exp == NULL_TREE
+         || TREE_CODE (ranges[i].exp) != SSA_NAME
+         || !ranges[i].in_p)
        continue;
 
       tree type = TREE_TYPE (ranges[i].exp);
@@ -2878,6 +2880,8 @@ optimize_range_tests_var_bound (enum tre
       tree rhs1, rhs2;
       if (ranges[i].exp)
        {
+         if (TREE_CODE (ranges[i].exp) != SSA_NAME)
+           continue;
          stmt = SSA_NAME_DEF_STMT (ranges[i].exp);
          if (!is_gimple_assign (stmt))
            continue;
--- gcc/testsuite/gcc.c-torture/compile/pr77901.c.jj    2016-10-08 
18:05:47.590172355 +0200
+++ gcc/testsuite/gcc.c-torture/compile/pr77901.c       2016-10-08 
18:05:31.000000000 +0200
@@ -0,0 +1,10 @@
+/* PR tree-optimization/77901 */
+
+void bar (void);
+
+void
+foo (int *x, long *y)
+{
+  if (*y && *x != 10 && *x != 12 && *y >= 0)
+    bar ();
+}

        Jakub