$DragonFly: src/gnu/usr.bin/cc34/cc_prep/patches/cse.c.patch,v 1.2 2004/06/20 00:10:52 joerg Exp $

diff -u ../gcc.orig/cse.c cse.c
--- ../gcc.orig/cse.c	2004-06-19 22:27:09.000000000 +0200
+++ cse.c	2004-06-20 01:16:04.000000000 +0200
@@ -4203,7 +4203,14 @@
 
 	      if (new_const == 0)
 		break;
-
+#ifndef FRAME_GROWS_DOWNWARD
+	      if (flag_propolice_protection
+		  && GET_CODE (y) == PLUS
+		  && XEXP (y, 0) == frame_pointer_rtx
+		  && INTVAL (inner_const) > 0
+		  && INTVAL (new_const) <= 0)
+		break;
+#endif
 	      /* If we are associating shift operations, don't let this
 		 produce a shift of the size of the object or larger.
 		 This could occur when we follow a sign-extend by a right
@@ -4735,6 +4742,14 @@
       if (SET_DEST (x) == pc_rtx
 	  && GET_CODE (SET_SRC (x)) == LABEL_REF)
 	;
+      /* cut the reg propagation of stack-protected argument.  */
+      else if (SET_VOLATILE_P (x)) {
+	rtx x1 = SET_DEST (x);
+	if (GET_CODE (x1) == SUBREG && GET_CODE (SUBREG_REG (x1)) == REG)
+	  x1 = SUBREG_REG (x1);
+	if (! REGNO_QTY_VALID_P(REGNO (x1)))
+	  make_new_qty (REGNO (x1), GET_MODE (x1));
+      }
 
       /* Don't count call-insns, (set (reg 0) (call ...)), as a set.
 	 The hard function value register is used only once, to copy to