> As Konstantinos explained, this is something of the order of 6 moves > around from integer to float and back again for a relatively simple > function like sinf() which takes one floating point argument and > returns one. vmov rN, sN has a penalty of around 20 cycles. Nothing is > being done here, it stalls the entire pipeline until it is complete. > You can't schedule around it. And it does this 6 times.
This is nonsense, as I already explained[1]. The hard-float ABI version of sinf actually has more unavoidable stalls than the soft-float ABI. Paul [1] http://lists.debian.org/debian-arm/2010/07/msg00147.html. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
