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run/mini/naked_asm5: New x86_64 ABI passes the arguments in reverse order.
author | David Nadlinger <code@klickverbot.at> |
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date | Sat, 23 Apr 2011 22:57:32 +0200 |
parents | c6ef09dfba4d |
children |
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module assign; // this is taken from std.intrinsic from gdc int mybtc(uint *p, uint bitnum) { uint * q = p + (bitnum / (uint.sizeof*8)); uint mask = 1 << (bitnum & ((uint.sizeof*8) - 1)); int result = *q & mask; *q ^= mask; return result ? -1 : 0; } void main() { uint i = 0xFFFF_FFFF; int r = mybtc(&i, 31); assert(r); assert(i == 0x7FFF_FFFF); r = mybtc(&i, 31); assert(!r); assert(i == 0xFFFF_FFFF); }