re PR rtl-optimization/89965 (wrong code with -O -mtune=nano-x2 -fcaller-saves…

re PR rtl-optimization/89965 (wrong code with -O -mtune=nano-x2 -fcaller-saves -fexpensive-optimizations -fno-tree-dce -fno-tree-ter)

	PR rtl-optimization/89965
	* dce.c (sp_based_mem_offset): New function.
	(find_call_stack_args): Use sp_based_mem_offset.

From-SVN: r270278

gcc/ChangeLog

+2019-04-11  Jakub Jelinek  <jakub@redhat.com>
+	
+	PR rtl-optimization/89965
+	* dce.c (sp_based_mem_offset): New function.
+	(find_call_stack_args): Use sp_based_mem_offset.
+
 2019-04-11  Jonathan Wakely  <jwakely@redhat.com>
 
 	* doc/invoke.texi (Optimize Options): Clarify -flive-patching docs.

gcc/dce.c

@@ -272,6 +272,58 @@ check_argument_store (HOST_WIDE_INT size, HOST_WIDE_INT off,
   return true;
 }
 
+/* If MEM has sp address, return 0, if it has sp + const address,
+   return that const, if it has reg address where reg is set to sp + const
+   and FAST is false, return const, otherwise return
+   INTTYPE_MINUMUM (HOST_WIDE_INT).  */
+
+static HOST_WIDE_INT
+sp_based_mem_offset (rtx_call_insn *call_insn, const_rtx mem, bool fast)
+{
+  HOST_WIDE_INT off = 0;
+  rtx addr = XEXP (mem, 0);
+  if (GET_CODE (addr) == PLUS
+      && REG_P (XEXP (addr, 0))
+      && CONST_INT_P (XEXP (addr, 1)))
+    {
+      off = INTVAL (XEXP (addr, 1));
+      addr = XEXP (addr, 0);
+    }
+  if (addr == stack_pointer_rtx)
+    return off;
+
+  if (!REG_P (addr) || fast)
+    return INTTYPE_MINIMUM (HOST_WIDE_INT);
+
+  /* If not fast, use chains to see if addr wasn't set to sp + offset.  */
+  df_ref use;
+  FOR_EACH_INSN_USE (use, call_insn)
+  if (rtx_equal_p (addr, DF_REF_REG (use)))
+    break;
+
+  if (use == NULL)
+    return INTTYPE_MINIMUM (HOST_WIDE_INT);
+
+  struct df_link *defs;
+  for (defs = DF_REF_CHAIN (use); defs; defs = defs->next)
+    if (! DF_REF_IS_ARTIFICIAL (defs->ref))
+      break;
+
+  if (defs == NULL)
+    return INTTYPE_MINIMUM (HOST_WIDE_INT);
+
+  rtx set = single_set (DF_REF_INSN (defs->ref));
+  if (!set)
+    return INTTYPE_MINIMUM (HOST_WIDE_INT);
+
+  if (GET_CODE (SET_SRC (set)) != PLUS
+      || XEXP (SET_SRC (set), 0) != stack_pointer_rtx
+      || !CONST_INT_P (XEXP (SET_SRC (set), 1)))
+    return INTTYPE_MINIMUM (HOST_WIDE_INT);
+
+  off += INTVAL (XEXP (SET_SRC (set), 1));
+  return off;
+}
 
 /* Try to find all stack stores of CALL_INSN arguments if
    ACCUMULATE_OUTGOING_ARGS.  If all stack stores have been found
@@ -309,58 +361,13 @@ find_call_stack_args (rtx_call_insn *call_insn, bool do_mark, bool fast,
     if (GET_CODE (XEXP (p, 0)) == USE
 	&& MEM_P (XEXP (XEXP (p, 0), 0)))
       {
-	rtx mem = XEXP (XEXP (p, 0), 0), addr;
-	HOST_WIDE_INT off = 0, size;
+	rtx mem = XEXP (XEXP (p, 0), 0);
+	HOST_WIDE_INT size;
 	if (!MEM_SIZE_KNOWN_P (mem) || !MEM_SIZE (mem).is_constant (&size))
 	  return false;
-	addr = XEXP (mem, 0);
-	if (GET_CODE (addr) == PLUS
-	    && REG_P (XEXP (addr, 0))
-	    && CONST_INT_P (XEXP (addr, 1)))
-	  {
-	    off = INTVAL (XEXP (addr, 1));
-	    addr = XEXP (addr, 0);
-	  }
-	if (addr != stack_pointer_rtx)
-	  {
-	    if (!REG_P (addr))
-	      return false;
-	    /* If not fast, use chains to see if addr wasn't set to
-	       sp + offset.  */
-	    if (!fast)
-	      {
-		df_ref use;
-		struct df_link *defs;
-		rtx set;
-
-		FOR_EACH_INSN_USE (use, call_insn)
-		  if (rtx_equal_p (addr, DF_REF_REG (use)))
-		    break;
-
-		if (use == NULL)
-		  return false;
-
-		for (defs = DF_REF_CHAIN (use); defs; defs = defs->next)
-		  if (! DF_REF_IS_ARTIFICIAL (defs->ref))
-		    break;
-
-		if (defs == NULL)
-		  return false;
-
-		set = single_set (DF_REF_INSN (defs->ref));
-		if (!set)
-		  return false;
-
-		if (GET_CODE (SET_SRC (set)) != PLUS
-		    || XEXP (SET_SRC (set), 0) != stack_pointer_rtx
-		    || !CONST_INT_P (XEXP (SET_SRC (set), 1)))
-		  return false;
-
-		off += INTVAL (XEXP (SET_SRC (set), 1));
-	      }
-	    else
-	      return false;
-	  }
+	HOST_WIDE_INT off = sp_based_mem_offset (call_insn, mem, fast);
+	if (off == INTTYPE_MINIMUM (HOST_WIDE_INT))
+	  return false;
 	min_sp_off = MIN (min_sp_off, off);
 	max_sp_off = MAX (max_sp_off, off + size);
       }
@@ -376,40 +383,14 @@ find_call_stack_args (rtx_call_insn *call_insn, bool do_mark, bool fast,
     if (GET_CODE (XEXP (p, 0)) == USE
 	&& MEM_P (XEXP (XEXP (p, 0), 0)))
       {
-	rtx mem = XEXP (XEXP (p, 0), 0), addr;
-	HOST_WIDE_INT off = 0, byte, size;
+	rtx mem = XEXP (XEXP (p, 0), 0);
 	/* Checked in the previous iteration.  */
-	size = MEM_SIZE (mem).to_constant ();
-	addr = XEXP (mem, 0);
-	if (GET_CODE (addr) == PLUS
-	    && REG_P (XEXP (addr, 0))
-	    && CONST_INT_P (XEXP (addr, 1)))
-	  {
-	    off = INTVAL (XEXP (addr, 1));
-	    addr = XEXP (addr, 0);
-	  }
-	if (addr != stack_pointer_rtx)
-	  {
-	    df_ref use;
-	    struct df_link *defs;
-	    rtx set;
-
-	    FOR_EACH_INSN_USE (use, call_insn)
-	      if (rtx_equal_p (addr, DF_REF_REG (use)))
-		break;
-
-	    for (defs = DF_REF_CHAIN (use); defs; defs = defs->next)
-	      if (! DF_REF_IS_ARTIFICIAL (defs->ref))
-		break;
-
-	    set = single_set (DF_REF_INSN (defs->ref));
-	    off += INTVAL (XEXP (SET_SRC (set), 1));
-	  }
-	for (byte = off; byte < off + size; byte++)
-	  {
-	    if (!bitmap_set_bit (sp_bytes, byte - min_sp_off))
-	      gcc_unreachable ();
-	  }
+	HOST_WIDE_INT size = MEM_SIZE (mem).to_constant ();
+	HOST_WIDE_INT off = sp_based_mem_offset (call_insn, mem, fast);
+	gcc_checking_assert (off != INTTYPE_MINIMUM (HOST_WIDE_INT));
+	for (HOST_WIDE_INT byte = off; byte < off + size; byte++)
+	  if (!bitmap_set_bit (sp_bytes, byte - min_sp_off))
+	    gcc_unreachable ();
       }
 
   /* Walk backwards, looking for argument stores.  The search stops
@@ -418,9 +399,6 @@ find_call_stack_args (rtx_call_insn *call_insn, bool do_mark, bool fast,
   ret = false;
   for (insn = PREV_INSN (call_insn); insn; insn = prev_insn)
     {
-      rtx set, mem, addr;
-      HOST_WIDE_INT off;
-
       if (insn == BB_HEAD (BLOCK_FOR_INSN (call_insn)))
 	prev_insn = NULL;
       else
@@ -432,61 +410,17 @@ find_call_stack_args (rtx_call_insn *call_insn, bool do_mark, bool fast,
       if (!NONDEBUG_INSN_P (insn))
 	continue;
 
-      set = single_set (insn);
+      rtx set = single_set (insn);
       if (!set || SET_DEST (set) == stack_pointer_rtx)
 	break;
 
       if (!MEM_P (SET_DEST (set)))
 	continue;
 
-      mem = SET_DEST (set);
-      addr = XEXP (mem, 0);
-      off = 0;
-      if (GET_CODE (addr) == PLUS
-	  && REG_P (XEXP (addr, 0))
-	  && CONST_INT_P (XEXP (addr, 1)))
-	{
-	  off = INTVAL (XEXP (addr, 1));
-	  addr = XEXP (addr, 0);
-	}
-      if (addr != stack_pointer_rtx)
-	{
-	  if (!REG_P (addr))
-	    break;
-	  if (!fast)
-	    {
-	      df_ref use;
-	      struct df_link *defs;
-	      rtx set;
-
-	      FOR_EACH_INSN_USE (use, insn)
-		if (rtx_equal_p (addr, DF_REF_REG (use)))
-		  break;
-
-	      if (use == NULL)
-		break;
-
-	      for (defs = DF_REF_CHAIN (use); defs; defs = defs->next)
-		if (! DF_REF_IS_ARTIFICIAL (defs->ref))
-		  break;
-
-	      if (defs == NULL)
-		break;
-
-	      set = single_set (DF_REF_INSN (defs->ref));
-	      if (!set)
-		break;
-
-	      if (GET_CODE (SET_SRC (set)) != PLUS
-		  || XEXP (SET_SRC (set), 0) != stack_pointer_rtx
-		  || !CONST_INT_P (XEXP (SET_SRC (set), 1)))
-		break;
-
-	      off += INTVAL (XEXP (SET_SRC (set), 1));
-	    }
-	  else
-	    break;
-	}
+      rtx mem = SET_DEST (set);
+      HOST_WIDE_INT off = sp_based_mem_offset (call_insn, mem, fast);
+      if (off == INTTYPE_MINIMUM (HOST_WIDE_INT))
+	break;
 
       HOST_WIDE_INT size;
       if (!MEM_SIZE_KNOWN_P (mem)