re PR target/13256 (strict_low_part mistreated in delay slots)

	PR target/13256
	* resource.h (enum mark_resource_type): Remove member MARK_DEST.
	The only user changed as follows:
	* resource.c (mark_set_resources) <case SET>: Always recurse for
	SET_SRC (x).
	<case SIGN_EXTRACT, case ZERO_EXTRACT>: Always recurse on
	operands.
	<case STRICT_LOW_PART>: Delete, deferring to default code.

From-SVN: r74328

gcc/ChangeLog

+2003-12-05  Hans-Peter Nilsson  <hp@axis.com>
+
+	PR target/13256
+	* resource.h (enum mark_resource_type): Remove member MARK_DEST.
+	The only user changed as follows:
+	* resource.c (mark_set_resources) <case SET>: Always recurse for
+	SET_SRC (x).
+	<case SIGN_EXTRACT, case ZERO_EXTRACT>: Always recurse on
+	operands.
+	<case STRICT_LOW_PART>: Delete, deferring to default code.
+
 2003-12-05  Waldek Hebisch <hebisch@math.uni.wroc.pl>
 
 	* stmt.c (expand_nl_goto_receiver): Copy hard register clobbers

gcc/resource.c

@@ -616,7 +616,7 @@ find_dead_or_set_registers (rtx target, struct resources *res,
 /* Given X, a part of an insn, and a pointer to a `struct resource',
    RES, indicate which resources are modified by the insn. If
    MARK_TYPE is MARK_SRC_DEST_CALL, also mark resources potentially
-   set by the called routine.  If MARK_TYPE is MARK_DEST, only mark SET_DESTs
+   set by the called routine.
 
    If IN_DEST is nonzero, it means we are inside a SET.  Otherwise,
    objects are being referenced instead of set.
@@ -716,7 +716,6 @@ mark_set_resources (rtx x, struct resources *res, int in_dest,
 			   || GET_CODE (SET_SRC (x)) != CALL),
 			  mark_type);
 
-      if (mark_type != MARK_DEST)
       mark_set_resources (SET_SRC (x), res, 0, MARK_SRC_DEST);
       return;
 
@@ -747,12 +746,9 @@ mark_set_resources (rtx x, struct resources *res, int in_dest,
 
     case SIGN_EXTRACT:
     case ZERO_EXTRACT:
-      if (! (mark_type == MARK_DEST && in_dest))
-	{
       mark_set_resources (XEXP (x, 0), res, in_dest, MARK_SRC_DEST);
       mark_set_resources (XEXP (x, 1), res, 0, MARK_SRC_DEST);
       mark_set_resources (XEXP (x, 2), res, 0, MARK_SRC_DEST);
-	}
       return;
 
     case MEM:
@@ -799,13 +795,6 @@ mark_set_resources (rtx x, struct resources *res, int in_dest,
 	}
       return;
 
-    case STRICT_LOW_PART:
-      if (! (mark_type == MARK_DEST && in_dest))
-	{
-	  mark_set_resources (XEXP (x, 0), res, 0, MARK_SRC_DEST);
-	  return;
-	}
-
     case UNSPEC_VOLATILE:
     case ASM_INPUT:
       /* Traditional asm's are always volatile.  */

gcc/resource.h

@@ -37,8 +37,7 @@ struct resources
 enum mark_resource_type
 {
   MARK_SRC_DEST = 0,
-  MARK_SRC_DEST_CALL = 1,
-  MARK_DEST = 2
+  MARK_SRC_DEST_CALL = 1
 };
 
 extern void mark_target_live_regs (rtx, rtx, struct resources *);