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Subject: Please test "bsf eax, VAR", VAR==0

Author: Severi Salminen

Date: 05:19:25 01/17/02

I'd really like to know if it is safe to assume, the eax will be left
unaffected.

Som do this:

mov eax,0xffffffff
mov dword ptr VAR,0

start:
bsf eax,dword ptr VAR
cmp eax, 0xffffffff
jne exit
bsr eax,dword ptr VAR
cmp eax, 0xffffffff
jne exit
jmp start
exit:

Let it run a little and check if it ever goes to exit:. I have not yet gotten
any good answers from Intel, but they are working on it. I won't use the fast
firstbit() and lastbit() versions if the above assumption is not valid.

Severi

• Re: Please test "bsf eax, VAR", VAR==0 Dann Corbit 14:05:41 01/17/02
  • Re: Please test "bsf eax, VAR", VAR==0 David Rasmussen 14:45:30 01/17/02

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