flow.c (mark_set_1): Do not record BLKmode stores as dead store elimination candidates.

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        * flow.c (mark_set_1): Do not record BLKmode stores as dead
        store elimination candidates.

From-SVN: r27140

gcc/ChangeLog

+Tue May 25 14:06:06 1999  Jeffrey A Law  (law@cygnus.com)
+
+	* flow.c (mark_set_1): Do not record BLKmode stores as dead
+	store elimination candidates.
+
 Tue May 25 08:55:57 1999  Gavin Romig-Koch  <gavin@cygnus.com>
 
 	* config/mips/mips.h (ASM_OUTPUT_DOUBLE_INT) : Use 'dword' if 

gcc/flow.c

@@ -3258,6 +3258,9 @@ mark_set_1 (needed, dead, x, insn, significant)
     invalidate_mems_from_autoinc (insn);
 
   if (GET_CODE (reg) == MEM && ! side_effects_p (reg)
+      /* We do not know the size of a BLKmode store, so we do not track
+	 them for redundant store elimination.  */
+      && GET_MODE (reg) != BLKmode
       /* There are no REG_INC notes for SP, so we can't assume we'll see 
 	 everything that invalidates it.  To be safe, don't eliminate any
 	 stores though SP; none of them should be redundant anyway.  */