(copy_rtx_if_shared): A CONST can be shared if it contains a

SYBOL_REF.

From-SVN: r2923

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 1335308..8291da1 100644 (file)
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -1267,6 +1267,15 @@ copy_rtx_if_shared (orig)
       /* SCRATCH must be shared because they represent distinct values. */
       return x;
 
+    case CONST:
+      /* CONST can be shared if it contains a SYMBOL_REF.  If it contains
+        a LABEL_REF, it isn't sharable.  */
+      if (GET_CODE (XEXP (x, 0)) == PLUS
+         && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF
+         && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)
+       return x;
+      break;
+
     case INSN:
     case JUMP_INSN:
     case CALL_INSN: