diff options
Diffstat (limited to 'string/tst-xbzero-opt.c')
| -rw-r--r-- | string/tst-xbzero-opt.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/string/tst-xbzero-opt.c b/string/tst-xbzero-opt.c index aab4a7f715..898345b288 100644 --- a/string/tst-xbzero-opt.c +++ b/string/tst-xbzero-opt.c @@ -97,6 +97,17 @@ static const unsigned char test_pattern[16] = static ucontext_t uc_main, uc_co; +static __attribute__ ((noinline, noclone)) int +use_test_buffer (unsigned char *buf) +{ + unsigned int sum = 0; + + for (unsigned int i = 0; i < PATTERN_REPS; i++) + sum += buf[i * PATTERN_SIZE]; + + return (sum == 2 * PATTERN_REPS) ? 0 : 1; +} + /* Always check the test buffer immediately after filling it; this makes externally visible side effects depend on the buffer existing and having been filled in. */ @@ -116,6 +127,10 @@ prepare_test_buffer (unsigned char *buf) if (swapcontext (&uc_co, &uc_main)) abort (); + + /* Force the compiler to really copy the pattern to buf. */ + if (use_test_buffer (buf)) + abort (); } static void |