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[svn r5] Initial commit. Most things are very rough.
author lindquist
date Sat, 01 Sep 2007 21:43:27 +0200
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0:a9e71648e74d 1:c53b6e3fe49a
1 module assign;
2
3 // this is taken from std.intrinsic from gdc
4
5 int mybtc(uint *p, uint bitnum)
6 {
7 uint * q = p + (bitnum / (uint.sizeof*8));
8 uint mask = 1 << (bitnum & ((uint.sizeof*8) - 1));
9 int result = *q & mask;
10 *q ^= mask;
11 return result ? -1 : 0;
12 }
13
14 void main()
15 {
16 uint i = 0xFFFF_FFFF;
17 int r = mybtc(&i, 31);
18 assert(r);
19 assert(i == 0x7FFF_FFFF);
20 r = mybtc(&i, 31);
21 assert(!r);
22 assert(i == 0xFFFF_FFFF);
23 }