On Friday, 22 September 2023 at 22:48:34 UTC, claptrap wrote:
On Friday, 22 September 2023 at 14:29:08 UTC, Vitaliy Fadeev
wrote:
x86 first bit check (odd check):
```asm
AND EAX, EAX ; update FLAG OF // odd flag
JO Label
```
Is there D-Lang operator of optimized library function ?
There's no "odd" flag, theres the overflow flag "O", and "JO"
is jump on overflow. Or there's the parity flag "P", which
signals an odd or even number of bits in the lowest byte of the
result (on x86 anyway).
If you just want to test if an int is odd or even, just do
if (x & 1) writeln("is odd");
else writeln("is even");
that'll compile to an AND and a jmp, or conditional move maybe.
If you want to access the parity flag I think you're out of
luck aside from using inline asm.
Thank, claptrap!
Yes, P FLAG, of course! JP instruction.
```asm
if (x & 1)
```
I am using the code above.
using inline asm
OK, may be.
