IA-64 sibcall unwind bug, PR target/13158

IA-64 sibcall unwind bug, PR target/13158
* config/ia64/ia64.c (ia64_expand_epilogue): Set RTX_FRAME_RELATED_P on
sibcall alloc instruction.
(process_set): Handle sibcall alloc instruction.

From-SVN: r89714

gcc/ChangeLog

+2004-10-27  James E Wilson  <wilson@specifixinc.com>
+
+	PR target/13158
+	* config/ia64/ia64.c (ia64_expand_epilogue): Set RTX_FRAME_RELATED_P on
+	sibcall alloc instruction.
+	(process_set): Handle sibcall alloc instruction.
+
 2004-10-27  Geoffrey Keating  <geoffk@apple.com>
 
 	* doc/tm.texi (USE_SELECT_SECTION_FOR_FUNCTIONS): Document.

gcc/config/ia64/ia64.c

@@ -2604,10 +2604,13 @@ ia64_expand_epilogue (int sibcall_p)
 	 preserve those input registers used as arguments to the sibling call.
 	 It is unclear how to compute that number here.  */
       if (current_frame_info.n_input_regs != 0)
-	emit_insn (gen_alloc (gen_rtx_REG (DImode, fp),
+	{
+	  rtx n_inputs = GEN_INT (current_frame_info.n_input_regs);
+	  insn = emit_insn (gen_alloc (gen_rtx_REG (DImode, fp),
 				const0_rtx, const0_rtx,
-			      GEN_INT (current_frame_info.n_input_regs),
-			      const0_rtx));
+				n_inputs, const0_rtx));
+	  RTX_FRAME_RELATED_P (insn) = 1;
+	}
     }
 }
 
@@ -7290,13 +7293,24 @@ process_set (FILE *asm_out_file, rtx pat)
     {
       dest_regno = REGNO (dest);
 
-      /* If this isn't the final destination for ar.pfs, the alloc
-	 shouldn't have been marked frame related.  */
-      if (dest_regno != current_frame_info.reg_save_ar_pfs)
-	abort ();
-
+      /* If this is the final destination for ar.pfs, then this must
+	 be the alloc in the prologue.  */
+      if (dest_regno == current_frame_info.reg_save_ar_pfs)
 	fprintf (asm_out_file, "\t.save ar.pfs, r%d\n",
 		 ia64_dbx_register_number (dest_regno));
+      else
+	{
+	  /* This must be an alloc before a sibcall.  We must drop the
+	     old frame info.  The easiest way to drop the old frame
+	     info is to ensure we had a ".restore sp" directive
+	     followed by a new prologue.  If the procedure doesn't
+	     have a memory-stack frame, we'll issue a dummy ".restore
+	     sp" now.  */
+	  if (current_frame_info.total_size == 0)
+	    /* if haven't done process_epilogue() yet, do it now */
+	    process_epilogue ();
+	  fprintf (asm_out_file, "\t.prologue\n");
+	}
       return 1;
     }