certanly.
On Wednesday 25 September 2002 16:08, Bill Knight wrote: > If you choose to implement some of the shift operations using the h/w > multiplier, you might consider supplying some means of turning the > feature either ON or OFF. The reason is that I do not believe the > code would be reentrant and a call to an interrupt service routine or > a pre-emptive task swap by an RTOS during a h/w multiply may cause > some problems that would be very difficult to track. Disabling > interrupts during the operation is probably required. I'm offering > these comments to help explore the side effects of the proposal. > Obviously because I do not have much of an understanding of the > implementation details and I have not studied the specifics of the H/W > multiplier, the comments may not apply. > > -Bill Knight > R O SoftWare > > On Wed, 25 Sep 2002 14:11:18 +0400, Dmitry wrote: > >Fellows, > >I'm just wondering if: > >1. Somebody uses -mcall-shifts? > >2. Will it be better to perform shifts left of a variable as a > > multiplication under certain circumstances? For example, following > > operations will be performed better via multiplicaion, providing HW > > multiplier exists: > > > >char a << [numb] > >where numb are 3,4,5,6,7 > > > >int a << [numb] > >where numb are [3-7] [10-15] > > > >long a << [numb] > >where numb are [8-15] [20-31] > > > > > >What do you think? > > > >~d > > ------------------------------------------------------- > This sf.net email is sponsored by:ThinkGeek > Welcome to geek heaven. > http://thinkgeek.com/sf > _______________________________________________ > Mspgcc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mspgcc-users -- /******************************************************************** ("`-''-/").___..--''"`-._ (\ Dimmy the Wild UA1ACZ `6_ 6 ) `-. ( ).`-.__.`) Enterprise Information Sys (_Y_.)' ._ ) `._ `. ``-..-' Nevsky prospekt, 20 / 44 _..`--'_..-_/ /--'_.' ,' Saint Petersburg, Russia (il),-'' (li),' ((!.-' +7 (812) 3468202, 5585314 ********************************************************************/
