package/gcc/arc-2015.12/901-UPDATE1-Fix-handling-complex-PIC-moves.patch

From f00b0f17d6889d811468c2c77508fbea8bfc377d Mon Sep 17 00:00:00 2001
From: Claudiu Zissulescu <claziss@synopsys.com>
Date: Tue, 19 Jan 2016 14:40:16 +0100
Subject: [PATCH] UPDATE1: Fix handling complex PIC moves.

The arc_legitimate_pc_offset_p condition is too lax. Updated it.

The fix is done in development tree: [arc-4.8-dev f00b0f1] 
and will be a part of the next release of ARC GNU tools.
Once that new release happens this patch must be removed.

gcc/
2016-01-18  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_needs_pcl_p ): New function
	(arc_legitimate_pc_offset_p): Use arc_needs_pcl_p.
---
 gcc/config/arc/arc.c | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index f7cae9f..18d88a3 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -5234,6 +5234,45 @@ arc_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED,
     }
 }
 
+/* Helper used by arc_legitimate_pc_offset_p.  */
+
+static bool
+arc_needs_pcl_p (rtx x)
+{
+  register const char *fmt;
+  register int i, j;
+
+  if ((GET_CODE (x) == UNSPEC)
+      && (XVECLEN (x, 0) == 1)
+      && (GET_CODE (XVECEXP (x, 0, 0)) == SYMBOL_REF))
+    switch (XINT (x, 1))
+      {
+      case ARC_UNSPEC_GOT:
+      case ARC_UNSPEC_GOTOFFPC:
+      case UNSPEC_TLS_GD:
+      case UNSPEC_TLS_IE:
+	return true;
+      default:
+	break;
+      }
+
+  fmt = GET_RTX_FORMAT (GET_CODE (x));
+  for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)
+    {
+      if (fmt[i] == 'e')
+	{
+	  if (arc_needs_pcl_p (XEXP (x, i)))
+	    return true;
+	}
+      else if (fmt[i] == 'E')
+	for (j = XVECLEN (x, i) - 1; j >= 0; j--)
+	  if (arc_needs_pcl_p (XVECEXP (x, i, j)))
+	    return true;
+    }
+
+  return false;
+}
+
 /* Return true if ADDR is an address that needs to be expressed as an
    explicit sum of pcl + offset.  */
 
@@ -5242,8 +5281,7 @@ arc_legitimate_pc_offset_p (rtx addr)
 {
   if (GET_CODE (addr) != CONST)
     return false;
-  addr = XEXP (addr, 0);
-  return flag_pic && !arc_raw_symbolic_reference_mentioned_p (addr, false);
+  return arc_needs_pcl_p (addr);
 }
 
 /* Return true if ADDR is a valid pic address.
-- 
2.5.0