raju goruganti <raju.goruganti@xxxxxxxxx> writes: > On Tue, Jan 4, 2011 at 4:33 AM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote: >> raju goruganti <raju.goruganti@xxxxxxxxx> writes: >> >>> Just I want to know ,Whether the dafult for '-mtp' is soft or not? >>> >>> If yes ,Why it has been Âchoosen as soft? >>> >>> I think mtp=cp15 Âis more efficient(I figured this out after some >>> google -search). >> >> From the friendly manual: >> >> `-mtp=NAME' >> Â Â Specify the access model for the thread local storage pointer. >> Â Â The valid models are `soft', which generates calls to >> Â Â `__aeabi_read_tp', `cp15', which fetches the thread pointer from >> Â Â `cp15' directly (supported in the arm6k architecture), and `auto', >> Â Â which uses the best available method for the selected processor. >> Â Â The default setting is `auto'. >> >> Ian >> > Thank you for your reply, > Yes,default is auto, and auto chooses soft in latest gcc. It depends on what processor the compiler has been configured for, and it will change based on the -march option. Ian
