Original Post
Thanks alot
[edited by - nomibegood on June 13, 2002 7:49:52 AM]
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Swapping values
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cant
x ^= y;
y ^= x;
x ^= y;
That should do it (it''s even faster than using a temporary value if I don''t recall wrong).
/ALiENiD
quote:
Original post by Useful
cant
yes my friend you can there is a way , i can''t figure it out though anyway thanks for reply..
You *can* do so:
x = x+y;
y = x-y;
x = x-y;
or for a longer discussion see this thread:
http://www.gamedev.net/community/forums/topic.asp?topic_id=98678
quote:
Original post by ALiENiD
x ^= y;
y ^= x;
x ^= y;
That should do it (it''s even faster than using a temporary value if I don''t recall wrong).
/ALiENiD
Thankyou very much for the reply ALiENiD I will try
quote:
Original post by felonius
You *can* do so:
x = x+y;
y = x-y;
x = x-y;
or for a longer discussion see this thread:
http://www.gamedev.net/community/forums/topic.asp?topic_id=98678
Thanks for the reply felonius
quote:
Original post by ALiENiD
x ^= y;
y ^= x;
x ^= y;
That should do it (it''s even faster than using a temporary value if I don''t recall wrong).
/ALiENiD
No, it''s not faster.
Any modern compiler can optimize away temporary variable and keep it all in the registers.
Swapping with XOR creates dependency between CPUs instructions - this code cannot be parallelized, which makes it bad for modern superscalar CPU.
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