Fix length of instructions that are in delay slot and needs to be predicated

Following problem was reported:
--->---
arceb-linux-gcc -mq-class -g -O2 -c -o main.o main.i
/tmp/ccudUc8y.s: Assembler messages:
/tmp/ccudUc8y.s:18820: Error: operand out of range (256 is not between -256 and 255)
--->---

Fix is taken from current development branch of GCC for ARC and will be a
part of the next release of ARC tools, so at that point patch should be dropped.

https://github.com/foss-for-synopsys-dwc-arc-processors/gcc/commit/5dfca5504d38293d5264f632c3090ac39c12f72b

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
---

diff --git a/gcc/config/arc/arc-protos.h b/gcc/config/arc/arc-protos.h
index 908d002..212423b 100644
--- a/gcc/config/arc/arc-protos.h
+++ b/gcc/config/arc/arc-protos.h
@@ -126,4 +126,5 @@ extern void arc_expand_compare_and_swap (rtx *);
 
 #ifdef  RTX_CODE
 extern void arc_expand_atomic_op (enum rtx_code, rtx, rtx, rtx, rtx, rtx);
+extern bool arc_bdr_iscond (rtx);
 #endif
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index 68e5552..7d3ded3 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -9336,6 +9336,23 @@ arc_write_ext_corereg (rtx insn)
   return for_each_rtx (&PATTERN (insn), write_ext_corereg_1, 0);
 }
 
+/* Return true if the insn is in a delay slot and needs to be executed
+   conditionally. */
+
+bool
+arc_bdr_iscond (rtx insn)
+{
+  rtx jump = prev_active_insn (insn);
+
+  if (!jump || !JUMP_P(jump))
+    return false;
+
+  if (INSN_ANNULLED_BRANCH_P (jump) && INSN_FROM_TARGET_P (insn))
+    return true;
+
+  return false;
+}
+
 /* This is like the hook, but returns NULL when it can't / won't generate
    a legitimate address.  */
 
diff --git a/gcc/config/arc/arc.md b/gcc/config/arc/arc.md
index e001659..88b2e37 100644
--- a/gcc/config/arc/arc.md
+++ b/gcc/config/arc/arc.md
@@ -377,7 +377,8 @@
 	(cond [(match_test "GET_CODE (PATTERN (insn)) == COND_EXEC")
 	       (const_int 12)]
 	      (const_int 10))
-	(match_test "GET_CODE (PATTERN (insn)) == COND_EXEC") (const_int 4)]
+	(match_test "GET_CODE (PATTERN (insn)) == COND_EXEC || arc_bdr_iscond (insn)")
+	(const_int 4)]
       (const_int 2))
 
     (eq_attr "iscompact" "true_limm")