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Tweak such that GCC v4 doesn't optimize it to the point where the

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test fails (it managed to unravel the recursion in f1).

(Logical change 1.290)
This commit is contained in:
hp.com!davidm 2005-05-03 09:13:17 +00:00
parent 2f63c6c54e
commit 02c9034eb2
1 changed files with 16 additions and 4 deletions
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20
tests/Gperf-simple.c
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@ -53,7 +53,7 @@ gettime (void)
return tv.tv_sec + 1e-6*tv.tv_usec; return tv.tv_sec + 1e-6*tv.tv_usec;
} }
static int static int __attribute__((noinline))
measure_unwind (int maxlevel, double *step) measure_unwind (int maxlevel, double *step)
{ {
double stop, start; double stop, start;
@ -79,15 +79,17 @@ measure_unwind (int maxlevel, double *step)
stop = gettime (); stop = gettime ();
if (level <= maxlevel) 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); level, maxlevel);
*step = (stop - start) / (double) level; *step = (stop - start) / (double) level;
return 0; return 0;
} }
static int static int f1 (int, int, double *);
f1 (int level, int maxlevel, double *step)
static int __attribute__((noinline))
g1 (int level, int maxlevel, double *step)
{ {
if (level == maxlevel) if (level == maxlevel)
return measure_unwind (maxlevel, step); return measure_unwind (maxlevel, step);
@ -96,6 +98,16 @@ f1 (int level, int maxlevel, double *step)
return f1 (level + 1, maxlevel, step) + level; 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 static void
doit (const char *label) doit (const char *label)
{ {