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libstdc++: Adjust tests to work for -D_GLIBCXX_USE_OLD_GENERATE_CANONICAL

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libstdc++-v3/ChangeLog:

	* testsuite/26_numerics/random/uniform_real_distribution/operators/64351.cc
	[_GLIBCXX_USE_OLD_GENERATE_CANONICAL]: Restore test01. Do not discard an
	extra value in test02.
	* testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon.cc:
	Skip if _GLIBCXX_USE_OLD_GENERATE_CANONICAL is defined in options.
This commit is contained in:
Jonathan Wakely
2025-12-17 13:58:21 +00:00
committed by Jonathan Wakely
parent c504ab2de5
commit 53893d44f3
2 changed files with 27 additions and 1 deletions
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25
libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/64351.cc
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@@ -21,6 +21,25 @@
#include <random>
#include <testsuite_hooks.h>
// libstdc++/64351
void
test01()
{
#ifdef _GLIBCXX_USE_OLD_GENERATE_CANONICAL
std::mt19937 rng(8890);
std::uniform_real_distribution<float> dist;
rng.discard(30e6);
for (long i = 0; i < 10e6; ++i)
{
auto n = dist(rng);
VERIFY( n != 1.f );
}
#else
// New generate_canonical is tested in ./gencanon.cc
#endif
}
// libstdc++/63176
void
test02()
@@ -37,13 +56,19 @@ test02()
rng2.discard(1);
}
// PR libstdc++/80137
#ifdef _GLIBCXX_USE_OLD_GENERATE_CANONICAL
// Each std::generate_canonical call should consume exactly one value.
#else
rng2.discard(1); // account for a 1.0 generated and discarded.
#endif
VERIFY( rng == rng2 );
}
int
main()
{
test01();
test02();
}

3
libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon.cc
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@@ -1,4 +1,5 @@
// { dg-do run { target { c++11 && { ! simulator } } } }
// { dg-skip-if "requires new impl" { *-*-* } { -D_GLIBCXX_USE_OLD_GENERATE_CANONICAL -D_GLIBCXX_USE_OLD_GENERATE_CANONICAL=1 } }
#include <random>
#include <limits>
@@ -17,7 +18,7 @@ struct local_rng : std::mt19937
local_rng(std::mt19937 const& arg) : std::mt19937(arg) {}
};
// Verify P0952R9 implementation requiring a second round-trip
// Verify P0952R2 implementation requiring a second round-trip
// if first yields exactly 1. In this test, the RNG delivering
// 32 bits per call is seeded such that this occurs once on the
// sixth iteration for float, and not at all for double.