This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [using gcc book] 5.20 double-word integers


On Sat, Aug 23, 2003 at 09:33:34PM -0400, Chris Devers wrote:
> Hello again,
> 
> In chapter five, section 5.9 (Double-Word Integers) of the _Using GCC_
> book, we have the following sentence:
> 
>     Multiplication is open-coded if the machine supports
>     fullword-to-doubleword a widening multiply instruction.
> 
> I feel this would read more clearly if written as follows:
> 
>     Multiplication is open-coded if the machine supports a
>     widening fullword-to-doubleword multiply instruction.

Warning: nitpicking ahead. 

On PPC32 at least, there is no widening multiply instruction, but 
there is a multiply high instruction which allows to easily compute 
all the necessary terms and is used for that purpose.

	Regards,
	Gabriel


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]