Drop -Wswitch-bool warning in function.c

[Kito Cheng]

Bootstrapped & regression-tested on x86_64-linux-gnu :)

2015-07-08  Kito Cheng  <kito.ch...@gmail.com>

        * function.c (stack_protect_epilogue): Use if rather than switch for
        check targetm.have_stack_protect_test().

From 0306990aac578167872a80ab55085d335e2bea14 Mon Sep 17 00:00:00 2001
From: Kito Cheng <k...@andestech.com>
Date: Wed, 8 Jul 2015 15:20:01 +0800
Subject: [PATCH] Drop -Wswitch-bool warning in function.c

---
 gcc/function.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/gcc/function.c b/gcc/function.c
index 972cdc8..b87aef6 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4874,26 +4874,18 @@ stack_protect_epilogue (void)
   tree guard_decl = targetm.stack_protect_guard ();
   rtx_code_label *label = gen_label_rtx ();
   rtx x, y, tmp;
+  rtx_insn *seq;
 
   x = expand_normal (crtl->stack_protect_guard);
   y = expand_normal (guard_decl);
 
   /* Allow the target to compare Y with X without leaking either into
      a register.  */
-  switch (targetm.have_stack_protect_test ())
-    {
-    case 1:
-      if (rtx_insn *seq = targetm.gen_stack_protect_test (x, y, label))
-	{
-	  emit_insn (seq);
-	  break;
-	}
-      /* FALLTHRU */
-
-    default:
-      emit_cmp_and_jump_insns (x, y, EQ, NULL_RTX, ptr_mode, 1, label);
-      break;
-    }
+  if (targetm.have_stack_protect_test ()
+      && ((seq = targetm.gen_stack_protect_test (x, y, label)) != NULL_RTX))
+    emit_insn (seq);
+  else
+    emit_cmp_and_jump_insns (x, y, EQ, NULL_RTX, ptr_mode, 1, label);
 
   /* The noreturn predictor has been moved to the tree level.  The rtl-level
      predictors estimate this branch about 20%, which isn't enough to get
-- 
2.3.5