Messages in this thread | | | Date | Fri, 18 Apr 2003 10:34:44 -0400 | From | Timothy Miller <> | Subject | Re: [PATCH] only use 48-bit lba when necessary |
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Chuck Ebbert wrote:
>Matt Mackall wrote: > > > > >>FYI, GCC as of 3.2.3 doesn't yet reduce the if(...) form to branchless >>code but the & and && versions come out the same with -O2. >> >> > > > The operands of & can be evaluated in any order, while && requires >left-to-right and does not evaluate the right operand if the left one >is false. Only the simplest cases could possibly generate the same >code. > > > I have a vague memory of reading a kerneltrap.org article or comment thread which discussed this. The determination was that a compiler could choose to fully evaluate the logical expression if there were no side-effects.
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