From: Richard Henderson <rth@cygnus.com>
Date: Tue, 12 Jan 1999 02:54:32 +0000 (-0800)
Subject: * cse.c (cse_insn): Never prefer (const (constant_p_rtx)).
X-Git-Tag: prereleases/libgcj-0.1~1378
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1ff136fd07190e18264edfd89b389d9d3d16655a;p=thirdparty%2Fgcc.git

* cse.c (cse_insn): Never prefer (const (constant_p_rtx)).

From-SVN: r24637
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c39187b13ae6..fc4996c54063 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jan 12 02:53:46 1999  Richard Henderson  <rth@cygnus.com>
+
+	* cse.c (cse_insn): Never prefer (const (constant_p_rtx)).
+
 Tue Jan 12 02:36:10 PST 1999 Jeff Law  (law@cygnus.com)
 
 	* version.c: Bump for snapshot.
diff --git a/gcc/cse.c b/gcc/cse.c
index 0d8fc4aeae0e..4ba247ce3ce8 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -6865,6 +6865,12 @@ cse_insn (insn, libcall_insn)
       if (src == src_folded)
         src_folded = 0;
 
+      /* Folds of constant_p_rtx are to be preferred, since we do
+	 not wish any to live past CSE.  */
+      if (src && GET_CODE (src) == CONST
+	  && GET_CODE (XEXP (src, 0)) == CONSTANT_P_RTX)
+	src = 0;
+
       /* At this point, ELT, if non-zero, points to a class of expressions
          equivalent to the source of this SET and SRC, SRC_EQV, SRC_FOLDED,
 	 and SRC_RELATED, if non-zero, each contain additional equivalent