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annotate test/assign.d @ 1:c53b6e3fe49a trunk

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