Mark -free as Optimization option.

From-SVN: r279946

gcc/ChangeLog

 2020-01-07  Martin Liska  <mliska@suse.cz>
 
-    PR optimization/92860
-    * params.opt: Mark param_min_crossjump_insns with Optimization
-    keyword.
+	PR tree-optimization/92860
+	* common.opt: Make flag_ree as optimization
+	attribute. 
+
+2020-01-07  Martin Liska  <mliska@suse.cz>
+
+	PR optimization/92860
+	* params.opt: Mark param_min_crossjump_insns with Optimization
+	keyword.
 
 2020-01-07  Luo Xiong Hu  <luoxhu@linux.ibm.com>
 

gcc/common.opt

@@ -2426,7 +2426,7 @@ Common Ignore
 Does nothing.  Preserved for backward compatibility.
 
 free
-Common Report Var(flag_ree) Init(0)
+Common Report Var(flag_ree) Init(0) Optimization
 Turn on Redundant Extensions Elimination pass.
 
 fshow-column

gcc/testsuite/ChangeLog

+2020-01-07  Martin Liska  <mliska@suse.cz>
+
+	PR tree-optimization/92860
+	* gcc.dg/pr92860.c: New test. 
+
 2020-01-07  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/91369

gcc/testsuite/gcc.dg/pr92860.c

+/* PR tree-optimization/92860.  */
+/* Testcase derived from 20111227-1.c to ensure that REE is combining
+   redundant zero extends with zero extend to wider mode.  */
+/* { dg-do compile  { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-fdump-rtl-ree" } */
+
+extern void abort (void);
+
+unsigned short s;
+unsigned int i;
+unsigned long l;
+unsigned char v = -1;
+
+void
+__attribute__ ((optimize("-O2")))
+baz()
+{
+}
+
+void __attribute__((noinline,noclone))
+bar (int t)
+{
+  if (t == 2 && s != 0xff)
+    abort ();
+  if (t == 1 && i != 0xff)
+    abort ();
+  if (t == 0 && l != 0xff)
+    abort ();
+}
+
+void __attribute__((noinline,noclone))
+foo (unsigned char *a, int t)
+{
+  unsigned char r = v;
+
+  if (t == 2)
+    s = (unsigned short) r;
+  else if (t == 1)
+    i = (unsigned int) r;
+  else if (t == 0)
+    l = (unsigned long) r;
+  bar (t);
+}
+
+int main(void)
+{
+  foo (&v, 0);
+  foo (&v, 1);
+  foo (&v, 2);
+  return 0;
+}
+
+/* { dg-final { scan-rtl-dump-not "Elimination opportunities" "ree" } }  */