[google] revert 173158 (-fstrict-enum-precisions) (issue4503041)

Index: tree-vrp.c
===================================================================
--- tree-vrp.c	(revision 173415)
+++ tree-vrp.c	(working copy)
@@ -5553,9 +5553,7 @@  stmt_interesting_for_vrp (gimple stmt)
 	  && ((is_gimple_call (stmt)
 	       && gimple_call_fndecl (stmt) != NULL_TREE
 	       && DECL_IS_BUILTIN (gimple_call_fndecl (stmt)))
-	      || !gimple_vuse (stmt))
-          && (flag_strict_enum_precision
-              || TREE_CODE (TREE_TYPE (lhs)) != ENUMERAL_TYPE))
+	      || !gimple_vuse (stmt)))
 	return true;
     }
   else if (gimple_code (stmt) == GIMPLE_COND
Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi	(revision 173415)
+++ doc/invoke.texi	(working copy)
@@ -395,8 +395,8 @@  Objective-C and Objective-C++ Dialects}.
 -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops @gol
 -fsignaling-nans -fsingle-precision-constant -fsplit-ivs-in-unroller @gol
 -fsplit-wide-types -fstack-protector -fstack-protector-all @gol
--fstrict-aliasing -fstrict-overflow -fno-strict-enum-precision -fthread-jumps
--ftracer -ftree-bit-ccp @gol
+-fstrict-aliasing -fstrict-overflow -fthread-jumps -ftracer @gol
+-ftree-bit-ccp @gol
 -ftree-builtin-call-dce -ftree-ccp -ftree-ch -ftree-copy-prop @gol
 -ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse @gol
 -ftree-forwprop -ftree-fre -ftree-loop-if-convert @gol
@@ -2075,11 +2075,6 @@  represented in the minimum number of bit
 enumerators).  This assumption may not be valid if the program uses a
 cast to convert an arbitrary integer value to the enumeration type.
 
-@item -fno-strict-enum-precision
-@opindex fno-strict-enum-precision
-Do not perform optimizations of switch() statements based on the
-precision of enum types.
-
 @item -ftemplate-depth=@var{n}
 @opindex ftemplate-depth
 Set the maximum instantiation depth for template classes to @var{n}.
Index: testsuite/g++.dg/other/no-strict-enum-precision-3.C
===================================================================
--- testsuite/g++.dg/other/no-strict-enum-precision-3.C	(revision 173415)
+++ testsuite/g++.dg/other/no-strict-enum-precision-3.C	(working copy)
@@ -1,5 +1,5 @@ 
 /* { dg-do run } */
-/* { dg-options "-O2 -fno-strict-enum-precision" } */
+/* { dg-options "-O2 -fno-strict-enums" } */
 
 extern "C" void abort (void);
 
Index: testsuite/g++.dg/other/no-strict-enum-precision-1.C
===================================================================
--- testsuite/g++.dg/other/no-strict-enum-precision-1.C	(revision 173415)
+++ testsuite/g++.dg/other/no-strict-enum-precision-1.C	(working copy)
@@ -1,5 +1,5 @@ 
 /* { dg-do run } */
-/* { dg-options "-fno-strict-enum-precision" } */
+/* { dg-options "-fno-strict-enums" } */
 
 extern "C" void abort (void);
 
Index: testsuite/g++.dg/other/no-strict-enum-precision-2.C
===================================================================
--- testsuite/g++.dg/other/no-strict-enum-precision-2.C	(revision 173415)
+++ testsuite/g++.dg/other/no-strict-enum-precision-2.C	(working copy)
@@ -1,5 +1,5 @@ 
 /* { dg-do run } */
-/* { dg-options "-O2 -fno-strict-enum-precision" } */
+/* { dg-options "-O2 -fno-strict-enums" } */
 
 extern "C" void abort (void);
 
Index: gimplify.c
===================================================================
--- gimplify.c	(revision 173415)
+++ gimplify.c	(working copy)
@@ -1602,8 +1602,6 @@  gimplify_switch_expr (tree *expr_p, gimp
 	    type = TREE_TYPE (SWITCH_COND (switch_expr));
 	  if (len
 	      && INTEGRAL_TYPE_P (type)
-              && (flag_strict_enum_precision
-                  || TREE_CODE (type) != ENUMERAL_TYPE)
 	      && TYPE_MIN_VALUE (type)
 	      && TYPE_MAX_VALUE (type)
 	      && tree_int_cst_equal (CASE_LOW (VEC_index (tree, labels, 0)),