Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic
From: H. Peter Anvin
Date: Mon May 25 2009 - 20:07:33 EST
Michael S. Zick wrote:
> Load Effective Address does two's complement arithmetic?
> I'll take your word for it.
LEA, and all other address calculations use 2's-complement arithmetic:
... is the same instruction.
However, gcc has been known to optimize out range checks when operating
on signed integers; it is allowed to do this by the C standard, but it
can give surprising results if the user expected wraparound.
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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