[PATCH] Fix up DSE - PR middle-end/64388, target/55023

[Jakub Jelinek]

On Tue, Jan 06, 2015 at 12:07:17PM -0500, John David Anglin wrote:
> On 1/6/2015 9:08 AM, Jakub Jelinek wrote:
> >@@ -2527,7 +2518,13 @@ scan_insn (bb_info_t bb_info, rtx_insn *
> >  		     const_call ? "const" : "memset", INSN_UID (insn));
> >  	  /* See the head comment of the frame_read field.  */
> >-	  if (reload_completed)
> >+	  if (reload_completed
> >+	      /* Tail calls are storing their arguments using
> >+		 arg poinnter.  If it is a frame pointer on the target,
> Typo.

Consider it fixed in my copy.

> >+		 even before reload we need to kill frame pointer based
> >+		 stores.  */
> >+	      || (SIBLING_CALL_P (insn)
> >+		  && HARD_FRAME_POINTER_IS_ARG_POINTER))
> >  	    insn_info->frame_read = true;
> 
> I had tested this hunk before, without the
> "HARD_FRAME_POINTER_IS_ARG_POINTER"
> addition, on 32-bit hppa and it resolved the original test case.

	Jakub