re PR tree-optimization/90626 (fold strcmp(a, b) == 0 to zero when one string…

re PR tree-optimization/90626 (fold strcmp(a, b) == 0 to zero when one string length is exact and the other is unequal)

PR tree-optimization/90626

gcc/ChangeLog:
	* tree-ssa-strlen.c (strxcmp_unequal): Fix typos.

From-SVN: r272487

gcc/ChangeLog

@@ -12,6 +12,9 @@
 2019-06-19  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/90626
+	* tree-ssa-strlen.c (strxcmp_unequal): Fix typos.
+
+	PR tree-optimization/90626
 	* tree-ssa-strlen.c (strxcmp_unequal): New function.
 	(handle_builtin_string_cmp): Call it.
 

gcc/tree-ssa-strlen.c

@@ -2981,7 +2981,7 @@ strxcmp_unequal (int idx1, int idx2, unsigned HOST_WIDE_INT n)
   if (idx2 < 0)
     {
       len2 = ~idx2;
-      nulterm1 = true;
+      nulterm2 = true;
     }
   else if (strinfo *si = get_strinfo (idx2))
     {
@@ -3003,7 +3003,8 @@ strxcmp_unequal (int idx1, int idx2, unsigned HOST_WIDE_INT n)
   if (len2 > n)
     len2 = n;
 
-  if (len1 != len2 && (nulterm1 || nulterm2))
+  if ((len1 < len2 && nulterm1)
+      || (len2 < len1 && nulterm2))
     /* The string lengths are definitely unequal and the result can
        be folded to one (since it's used for comparison with zero).  */
     return true;