Author: Armin Rigo <[email protected]>
Branch:
Changeset: r841:901792febe10
Date: 2012-08-13 10:45 +0200
http://bitbucket.org/cffi/cffi/changeset/901792febe10/
Log: Improve the test portability.
diff --git a/testing/test_verify.py b/testing/test_verify.py
--- a/testing/test_verify.py
+++ b/testing/test_verify.py
@@ -102,8 +102,7 @@
def test_longdouble_precision():
# Test that we don't loose any precision of 'long double' when
- # passing through Python and CFFI. This test might be too exact,
- # checking the results that we get on Intel.
+ # passing through Python and CFFI.
ffi = FFI()
ffi.cdef("long double step1(long double x);")
lib = ffi.verify("""
@@ -112,17 +111,26 @@
return 4*x-x*x;
}
""")
- for cast_to_double in [False, True]:
+ def do(cast_to_double):
x = 0.9789
- for i in range(50):
+ for i in range(10000):
x = lib.step1(x)
if cast_to_double:
x = float(x)
- if cast_to_double:
- expected = 3.3061
- else:
- expected = 3.2585
- assert (float(x) - expected) < 0.01
+ return float(x)
+
+ more_precise = do(False)
+ less_precise = do(True)
+ assert abs(more_precise - less_precise) > 0.1
+
+ # Check the particular results on Intel
+ import platform
+ if (platform.machine().startswith('i386') or
+ platform.machine().startswith('x86')):
+ assert abs(more_precise - 0.656769) < 0.001
+ assert abs(less_precise - 3.99091) < 0.001
+ else:
+ py.test.skip("don't know the very exact precision of 'long double'")
all_integer_types = ['short', 'int', 'long', 'long long',
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