From: rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 18 Nov 1999 00:52:07 +0000 (+0000)
Subject:         * cse.c (delete_trivially_dead_insns): Identify no-op insns
X-Git-Tag: upstream/4.9.2~104532
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=570c68fe7d86c33acd7186b1a80c55912af3e9eb;p=platform%2Fupstream%2Flinaro-gcc.git

    * cse.c (delete_trivially_dead_insns): Identify no-op insns
        containing subregs too.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@30563 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fe49964..1694b72 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+Wed Nov 17 16:51:23 1999  Richard Henderson  <rth@cygnus.com>
+
+	* cse.c (delete_trivially_dead_insns): Identify no-op insns
+	containing subregs too.
+
 Wed Nov 17 17:39:48 MST 1999	Diego Novillo <dnovillo@cygnus.com>
 
 	* invoke.texi: Add documentation for -muninit-const-in-rodata.
diff --git a/gcc/cse.c b/gcc/cse.c
index 0736cd9..979069c 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -7176,8 +7176,10 @@ delete_trivially_dead_insns (insns, nreg)
 	live_insn = ! dead_libcall;
       else if (GET_CODE (PATTERN (insn)) == SET)
 	{
-	  if (GET_CODE (SET_DEST (PATTERN (insn))) == REG
-	      && SET_DEST (PATTERN (insn)) == SET_SRC (PATTERN (insn)))
+	  if ((GET_CODE (SET_DEST (PATTERN (insn))) == REG
+	       || GET_CODE (SET_DEST (PATTERN (insn))) == SUBREG)
+	      && rtx_equal_p (SET_DEST (PATTERN (insn)),
+			      SET_SRC (PATTERN (insn))))
 	    ;
 
 #ifdef HAVE_cc0
@@ -7207,8 +7209,9 @@ delete_trivially_dead_insns (insns, nreg)
 
 	    if (GET_CODE (elt) == SET)
 	      {
-		if (GET_CODE (SET_DEST (elt)) == REG
-		    && SET_DEST (elt) == SET_SRC (elt))
+		if ((GET_CODE (SET_DEST (elt)) == REG
+		     || GET_CODE (SET_DEST (elt)) == SUBREG)
+		    && rtx_equal_p (SET_DEST (elt), SET_SRC (elt)))
 		  ;
 
 #ifdef HAVE_cc0