[PATCH] Fix seq_cost prototype to use signed int

[Jiong Wang <jiong.wang@arm.com>]

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All other cost helper functions are using signed int to hold cost
while seq_cost is using unsigned int.

This fix this. bootstrap OK on x86.

OK for trunk?

2015-09-08  Jiong Wang  <jiong.wang@arm.com>

gcc/
  * rtl.h (seq_cost): Change return type from "unsigned" to "int".
  * rtlanal.c (seq_cost): Likewise.
  
-- 
Regards,
Jiong


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diff --git a/gcc/rtl.h b/gcc/rtl.h
index ac56133..ded054c 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -3050,7 +3050,7 @@ extern rtx_insn *find_first_parameter_load (rtx_insn *, rtx_insn *);
 extern bool keep_with_call_p (const rtx_insn *);
 extern bool label_is_jump_target_p (const_rtx, const rtx_insn *);
 extern int insn_rtx_cost (rtx, bool);
-extern unsigned seq_cost (const rtx_insn *, bool);
+extern int seq_cost (const rtx_insn *, bool);

 /* Given an insn and condition, return a canonical description of
    the test being made.  */
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index ef98f4b..2f14b93 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -5160,10 +5160,10 @@ insn_rtx_cost (rtx pat, bool speed)

 /* Returns estimate on cost of computing SEQ.  */

-unsigned
+int
 seq_cost (const rtx_insn *seq, bool speed)
 {
-  unsigned cost = 0;
+  int cost = 0;
   rtx set;

   for (; seq; seq = NEXT_INSN (seq))