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Diffstat (limited to 'Lib/test/test_math.py')
| -rw-r--r-- | Lib/test/test_math.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py index 2c84e55..8d84904 100644 --- a/Lib/test/test_math.py +++ b/Lib/test/test_math.py @@ -1450,6 +1450,11 @@ class MathTests(unittest.TestCase): n = 20 # Length of vectors c = 1e30 # Target condition number + # If the following test fails, it means that the C math library + # implementation of fma() is not compliant with the C99 standard + # and is inaccurate. To solve this problem, make a new build + # with the symbol UNRELIABLE_FMA defined. That will enable a + # slower but accurate code path that avoids the fma() call. relative_err = median(Trial(math.sumprod, c, n) for i in range(times)) self.assertLess(relative_err, 1e-16) |