Hirokazu Yamamoto <ocean-c...@m2.ccsnet.ne.jp> added the comment:
Sorry，my patch didn't work again... Because of this
compiler behavior. Is this ANSI standard?
#include <stdio.h>
typedef unsigned __int32 uint32;
static void
print_bits(uint32 n)
{
int i;
for (i = 31; i >= 0; --i)
{
printf("%c", (n & (1 << i)) ? '1' : '0');
}
printf(" : %X\n", n);
}
int main()
{
uint32 n;
n = 1;
print_bits(n << 30);
print_bits(n << 31);
print_bits(n << 32);
print_bits((n << 31) << 1);
}
R:\test\bitshift>a
01000000000000000000000000000000 : 40000000
10000000000000000000000000000000 : 80000000
00000000000000000000000000000001 : 1
00000000000000000000000000000000 : 0
I thought n << 32 should be 0. I hope new patch
is somehow better.
----------
Added file: http://bugs.python.org/file19121/py3k_fix_ctypes_cfields_v2.patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6493>
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