x86: Implement change_bit with immediate operand as "lock xorb"

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Impact: Minor optimization.

Implement change_bit with immediate bit count as "lock xorb". This is
similar to  "lock orb" and "lock andb"  for set_bit and clear_bit
functions.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Uros Bizjak 2008-10-24 16:53:33 +02:00 • committed by H. Peter Anvin

parent a376f30a95

commit 838e8bb71d

1 changed files with 9 additions and 1 deletions

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arch/x86/include/asm/bitops.h

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