From: Richard Stallman <rms@gnu.org>
Date: Fri, 14 May 1993 19:00:45 +0000 (+0000)
Subject: (expand_decl): Don't set RTX_UNCHANGING_P.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b4bf13a89e99e8bd7fa60c9813003467db60d365;p=gcc.git

(expand_decl): Don't set RTX_UNCHANGING_P.

From-SVN: r4457
---

diff --git a/gcc/stmt.c b/gcc/stmt.c
index 4400f614a48..05b0738f551 100644
--- a/gcc/stmt.c
+++ b/gcc/stmt.c
@@ -2995,8 +2995,15 @@ expand_decl (decl)
 
   if (TREE_THIS_VOLATILE (decl))
     MEM_VOLATILE_P (DECL_RTL (decl)) = 1;
+#if 0 /* A variable is not necessarily unchanging
+	 just because it is const.  RTX_UNCHANGING_P
+	 means no change in the function,
+	 not merely no change in the variable's scope.
+	 It is correct to set RTX_UNCHANGING_P if the variable's scope
+	 is the whole function.  There's no convenient way to test that.  */
   if (TREE_READONLY (decl))
     RTX_UNCHANGING_P (DECL_RTL (decl)) = 1;
+#endif
 
   /* If doing stupid register allocation, make sure life of any
      register variable starts here, at the start of its scope.  */