From: Jim Wilson <wilson@gcc.gnu.org>
Date: Thu, 14 Jan 1993 18:33:41 +0000 (-0800)
Subject: (copy_rtx): A MEM with constant address is not sharable.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cc81e6253b50a6d819d5fbffaecceec38726c39d;p=gcc.git

(copy_rtx): A MEM with constant address is not sharable.

Undo Dec 27 change.

From-SVN: r3231
---

diff --git a/gcc/rtl.c b/gcc/rtl.c
index a47ebd53631..aca057d6f97 100644
--- a/gcc/rtl.c
+++ b/gcc/rtl.c
@@ -284,10 +284,10 @@ copy_rtx (orig)
 	return orig;
       break;
 
-    case MEM:
-      if (CONSTANT_ADDRESS_P (XEXP (orig, 0)))
-	return orig;
-      break;
+      /* A MEM with a constant address is not sharable.  The problem is that
+	 the constant address may need to be reloaded.  If the mem is shared,
+	 then reloading one copy of this mem will cause all copies to appear
+	 to have been reloaded.  */
     }
 
   copy = rtx_alloc (code);