Magic-Mirror/llvm-capstone
1
0
Fork 0
mirror of https://github.com/capstone-engine/llvm-capstone.git synced 2024-12-13 19:24:21 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fix a couple of bugs in linear_congruential_engine::seed. Regression test added.

Browse Source 
llvm-svn: 182421
This commit is contained in:
Howard Hinnant 2013-05-21 21:05:12 +00:00
parent eaa153bdad
commit 849821cffb
2 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libcxx/include/random
View File

@ -1835,7 +1835,7 @@ public:
// types
typedef _UIntType result_type;
private:
//private:
result_type __x_;
static _LIBCPP_CONSTEXPR const result_type _Mp = result_type(~0);
@ -1880,7 +1880,7 @@ public:
seed(_Sseq& __q)
{__seed(__q, integral_constant<unsigned,
1 + (__m == 0 ? (sizeof(result_type) * __CHAR_BIT__ - 1)/32
: (__m-1) / 0x100000000ull)>());}
: (__m > 0x100000000ull))>());}
// generating functions
_LIBCPP_INLINE_VISIBILITY
@ -1969,7 +1969,7 @@ linear_congruential_engine<_UIntType, __a, __c, __m>::__seed(_Sseq& __q,
uint32_t __ar[__k+3];
__q.generate(__ar, __ar + __k + 3);
result_type __s = static_cast<result_type>((__ar[3] +
(uint64_t)__ar[4] << 32) % __m);
((uint64_t)__ar[4] << 32)) % __m);
__x_ = __c == 0 && __s == 0 ? result_type(1) : __s;
}

8
libcxx/test/numerics/rand/rand.eng/rand.eng.lcong/seed_sseq.pass.cpp
View File

@ -28,4 +28,12 @@ int main()
e1.seed(sseq);
assert(e1 == e2);
}
{
unsigned a[] = {3, 5, 7, 9, 11};
std::seed_seq sseq(a, a+5);
typedef std::linear_congruential_engine<unsigned long long, 1, 1, 0x200000001ULL> E;
E e1(4309005589);
E e2(sseq);
assert(e1 == e2);
}
}