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* [gcc r12-8592] libstdc++: Simplify test by not using std::log2
@ 2022-07-21 11:16 Jonathan Wakely
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From: Jonathan Wakely @ 2022-07-21 11:16 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:145ef5e2be28183f2b92b1f81b4d75210b524503
commit r12-8592-g145ef5e2be28183f2b92b1f81b4d75210b524503
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Jun 23 11:58:16 2022 +0100
libstdc++: Simplify test by not using std::log2
This test uses std::log2 without including <cmath>, but it doesn't need
to use it at all. Just get the number of digits from numeric_limits
instead.
libstdc++-v3/ChangeLog:
* testsuite/26_numerics/random/random_device/entropy.cc: Use
numeric_limits<unsigned>::digits.
(cherry picked from commit 78fd15fd4a641cfac28ce60bf43a3e1ca309537b)
Diff:
---
libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc b/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc
index 63b7043bf9b..9f529f5d814 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc
@@ -1,6 +1,7 @@
// { dg-do run { target c++11 } }
#include <random>
+#include <limits>
#include <testsuite_hooks.h>
#include <testsuite_random.h>
@@ -12,7 +13,7 @@ test01()
VERIFY( std::random_device(token).entropy() == 0.0 );
using result_type = std::random_device::result_type;
- const double max = std::log2(std::numeric_limits<result_type>::max() + 1.0);
+ const double max = std::numeric_limits<result_type>::digits;
for (auto token : { "/dev/random", "/dev/urandom" })
if (__gnu_test::random_device_available(token))
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