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Fix string/tst-xbzero-opt if build with gcc head.
On s390x, the test string/tst-xbzero-opt is failing if build with gcc head: FAIL: no clear/prepare: expected 32 got 0 FAIL: no clear/test: expected some got 0 FAIL: ordinary clear/prepare: expected 32 got 0 INFO: ordinary clear/test: found 0 patterns (memset not eliminated) PASS: explicit clear/prepare: expected 32 got 32 PASS: explicit clear/test: expected 0 got 0 In setup_no_clear / setup_ordinary_clear, GCC is omitting the memcpy loop in prepare_test_buffer. Thus count_test_patterns does not find any of the test_pattern. This patch calls use_test_buffer in order to force the compiler to really copy the pattern to buf. ChangeLog: * string/tst-xbzero-opt.c (use_test_buffer): New function. (prepare_test_buffer): Call use_test_buffer as compiler barrier.
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@ -1,3 +1,8 @@
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2018-07-26 Stefan Liebler <stli@linux.ibm.com>
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* string/tst-xbzero-opt.c (use_test_buffer): New function.
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(prepare_test_buffer): Call use_test_buffer as compiler barrier.
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2018-07-26 Florian Weimer <fweimer@redhat.com>
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* htl/lockfile.c (flockfile, funlockfile, ftrylockfile): Use weak
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@ -97,6 +97,17 @@ static const unsigned char test_pattern[16] =
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static ucontext_t uc_main, uc_co;
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static __attribute__ ((noinline, noclone)) int
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use_test_buffer (unsigned char *buf)
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{
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unsigned int sum = 0;
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for (unsigned int i = 0; i < PATTERN_REPS; i++)
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sum += buf[i * PATTERN_SIZE];
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return (sum == 2 * PATTERN_REPS) ? 0 : 1;
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}
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/* Always check the test buffer immediately after filling it; this
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makes externally visible side effects depend on the buffer existing
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and having been filled in. */
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@ -116,6 +127,10 @@ prepare_test_buffer (unsigned char *buf)
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if (swapcontext (&uc_co, &uc_main))
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abort ();
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/* Force the compiler to really copy the pattern to buf. */
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if (use_test_buffer (buf))
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abort ();
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}
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static void
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