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tmtests/tmcontext01: Prevent GCC 7.1 optimizations

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It is getting harder to prevent the compiler from optimizing away the
recursive function calls.
This commit is contained in:
Sebastian Huber
2017-07-20 11:32:53 +02:00
parent b965f461a8
commit 1c256e6fbe
1 changed files with 21 additions and 20 deletions
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41
testsuites/tmtests/tmcontext01/init.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
* Copyright (c) 2014, 2017 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
@@ -36,7 +36,7 @@ const char rtems_test_name[] = "TMCONTEXT 1";
static rtems_counter_ticks t[SAMPLES];
static volatile bool always_true = true;
static volatile int prevent_optimization;
static size_t cache_line_size;
@@ -59,19 +59,17 @@ static int dirty_data_cache(volatile int *data, size_t n, size_t clsz, int j)
return i + j;
}
static int prevent_opt_func(int m, int n)
static int call_at_level(
int start,
int fl,
int s,
bool dirty
)
{
if (m == 0) {
return n + 1;
} else if (m > 0 && n == 0) {
return prevent_opt_func(m - 1, 1);
} else {
return prevent_opt_func(m - 1, prevent_opt_func(m, n - 1));
}
}
int prevent_optimization;;
prevent_optimization = start + fl;
static int call_at_level(int start, int fl, int s, bool dirty)
{
if (fl == start) {
/*
* Some architectures like the SPARC have register windows. A side-effect
@@ -82,11 +80,12 @@ static int call_at_level(int start, int fl, int s, bool dirty)
}
if (fl > 0) {
if (always_true) {
return call_at_level(start, fl - 1, s, dirty);
} else {
return prevent_opt_func(fl - 1, fl - 2);
}
call_at_level(
start,
fl - 1,
s,
dirty
);
} else {
char *volatile space;
rtems_counter_ticks a;
@@ -107,9 +106,9 @@ static int call_at_level(int start, int fl, int s, bool dirty)
b = rtems_counter_read();
t[s] = rtems_counter_difference(b, a);
return 0;
}
return prevent_optimization;
}
static void load_task(rtems_task_argument arg)
@@ -148,6 +147,8 @@ static void test_by_function_level(int fl, bool dirty)
uint64_t q3;
uint64_t max;
fl += prevent_optimization;
rtems_interrupt_lock_initialize(&lock, "test");
rtems_interrupt_lock_acquire(&lock, &lock_context);