From 02c9034eb214248646be46cb344b7a6e7b67f661 Mon Sep 17 00:00:00 2001
From: "hp.com!davidm" <hp.com!davidm>
Date: Tue, 3 May 2005 09:13:17 +0000
Subject: [PATCH] Tweak such that GCC v4 doesn't optimize it to the point where
 the test fails (it managed to unravel the recursion in f1).

(Logical change 1.290)
---
 tests/Gperf-simple.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/tests/Gperf-simple.c b/tests/Gperf-simple.c
index 7c2cc996..239ad26a 100644
--- a/tests/Gperf-simple.c
+++ b/tests/Gperf-simple.c
@@ -53,7 +53,7 @@ gettime (void)
   return tv.tv_sec + 1e-6*tv.tv_usec;
 }
 
-static int
+static int __attribute__((noinline))
 measure_unwind (int maxlevel, double *step)
 {
   double stop, start;
@@ -79,15 +79,17 @@ measure_unwind (int maxlevel, double *step)
   stop = gettime ();
 
   if (level <= maxlevel)
-    panic ("Unwound only %d levels, expected at least %d levels",
+    panic ("Unwound only %d levels, expected at least %d levels\n",
 	   level, maxlevel);
 
   *step = (stop - start) / (double) level;
   return 0;
 }
 
-static int
-f1 (int level, int maxlevel, double *step)
+static int f1 (int, int, double *);
+
+static int __attribute__((noinline))
+g1 (int level, int maxlevel, double *step)
 {
   if (level == maxlevel)
     return measure_unwind (maxlevel, step);
@@ -96,6 +98,16 @@ f1 (int level, int maxlevel, double *step)
     return f1 (level + 1, maxlevel, step) + level;
 }
 
+static int __attribute__((noinline))
+f1 (int level, int maxlevel, double *step)
+{
+  if (level == maxlevel)
+    return measure_unwind (maxlevel, step);
+  else
+    /* defeat last-call/sibcall optimization */
+    return g1 (level + 1, maxlevel, step) + level;
+}
+
 static void
 doit (const char *label)
 {