[backport gcc-4.9/trunk r199203, fixes PR57340 regression from PR19599 patch <mikpe@it.uu.se>]

gcc/

2013-05-22  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

	PR target/19599
	PR target/57340
	* config/arm/arm.c (any_sibcall_uses_r3): Rename to ..
	(any_sibcall_could_use_r3): this and handle indirect calls.
	(arm_get_frame_offsets): Rename use of any_sibcall_uses_r3.

--- gcc-4.8.0/gcc/config/arm/arm.c.~1~	2013-05-25 12:44:28.513538225 +0200
+++ gcc-4.8.0/gcc/config/arm/arm.c	2013-05-25 12:48:20.273426218 +0200
@@ -16834,11 +16834,27 @@ thumb_force_lr_save (void)
 	     || df_regs_ever_live_p (LR_REGNUM));
 }
 
+/* We do not know if r3 will be available because
+   we do have an indirect tailcall happening in this
+   particular case.  */
+static bool
+is_indirect_tailcall_p (rtx call)
+{
+  rtx pat = PATTERN (call);
+
+  /* Indirect tail call.  */
+  pat = XVECEXP (pat, 0, 0);
+  if (GET_CODE (pat) == SET)
+    pat = SET_SRC (pat);
+
+  pat = XEXP (XEXP (pat, 0), 0);
+  return REG_P (pat);
+}
 
 /* Return true if r3 is used by any of the tail call insns in the
    current function.  */
 static bool
-any_sibcall_uses_r3 (void)
+any_sibcall_could_use_r3 (void)
 {
   edge_iterator ei;
   edge e;
@@ -16852,7 +16868,8 @@ any_sibcall_uses_r3 (void)
 	if (!CALL_P (call))
 	  call = prev_nonnote_nondebug_insn (call);
 	gcc_assert (CALL_P (call) && SIBLING_CALL_P (call));
-	if (find_regno_fusage (call, USE, 3))
+	if (find_regno_fusage (call, USE, 3)
+	    || is_indirect_tailcall_p (call))
 	  return true;
       }
   return false;
@@ -17019,7 +17036,7 @@ arm_get_frame_offsets (void)
 	  /* If it is safe to use r3, then do so.  This sometimes
 	     generates better code on Thumb-2 by avoiding the need to
 	     use 32-bit push/pop instructions.  */
- 	  if (! any_sibcall_uses_r3 ()
+ 	  if (! any_sibcall_could_use_r3 ()
 	      && arm_size_return_regs () <= 12
 	      && (offsets->saved_regs_mask & (1 << 3)) == 0)
 	    {