swap (a, b) - test

[Michael Meissner]

ak@muc.de (Andi Kleen) writes:

> __asm__("xchg %1,%0" ...); might be faster on x86 too.

Only if both operands are in registers.  Xchg with a memory operand, sets the
LOCK prefix which can slow down the reference.

-- 
Michael Meissner, Cygnus Solutions (Massachusetts office)
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