Hi,
I have rather large program that fails to link - "Undefined symbol: .Lj3016"
The only difference with previous cases when link was successful is that
I added "indylaz" package - not sure if there is a connection...
What can I do or try to diagnose/resolve this issue?
(9022) Compiling
Fixed the problem. I was deallocating a register too soon, so it got
overwritten in some cases while still in use. Running tests again.
Gareth aka. Kit
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Div by 3 has a very elegant implementation. In 32-bit, it's
movl $0xAAAB,%eax
mull Input ; answer is in %edx:%eax
shrl $1,%edx
movl %edx, Result
As Marģers discovered, you can reduce the cycle count and minimise
pipeline stalls by extending to 64-bit and applying the shift to
Very interesting, Gareth !
Is the div-by-7 related to 2 to the 3rd ? If yes, is it possible to design a
div-by-3 with similar magics ?
Cheers, Ched'
Le 03.09.21 à 15:35, J. Gareth Moreton via fpc-devel a écrit :
Hey Marģers,
So I've been experimenting with your suggestion, and it looks
Hey Marģers,
So I've been experimenting with your suggestion, and it looks like a
resounding success! I added some new tests to the "bdiv" bench test to
see how it performs. 16-bit multiplications don't get improved as well
as they could be on x86_64 because the intermediate values are all
