SSE VS FPU

[jj2007]

I do not know why, but I got the impression that especially assembler programmers seems to be infested by the use-globals-as-much-as-possible pest  :bg

Even worse, some combine it with the use-threads-as-much-as-possible pest ::)

[qWord]

I do not know why, but I got the impression that especially assembler programmers seems to be infested by the use-globals-as-much-as-possible pest  :bg

Even worse, some combine it with the use-threads-as-much-as-possible pest ::)

thread safety isn't the only advantage of locals  ::)

[dedndave]

i think he's talking to me, qWord - lol
i use a thread whenever i need a synchronous function to be asynchronous   :bg
i am also probably guilty of using global vars too often
i usually stick things in global vars to start with, then clean them up and make them local, if it is appropriate
sometimes, i get lazy and don't do the clean-up

[jj2007]

i think he's talking to me, qWord - lol

Nope, Dave, that was a pure inner-German teasing :toothy
There is nothing wrong about locals, I also use them as much as appropriate. Or, to quote Einstein, I try to make everything as simple as possible but not simpler. There are moments when you need globals. There are moments when you need threads, but that's another story ::)

[Farabi]

i'll be home next day and try to make a complete procedure to compare it. currently im working on the capital city jakarta.

[Greenhorn__]

Sorry Sirs, I'm not familiar with all the SSE stuff.
Is there a little SSE tutorial out there ?

BTW, here are my results:

VertexTimings1

Code Select Expand

AMD FX(tm)-8150 Eight-Core Processor            (SSE4)
10 cycles for Vec_SubSSE
18 cycles for Vec_Sub
189 cycles for 100*fmul
30965 cycles for 100*mulsd

10 cycles for Vec_SubSSE
15 cycles for Vec_Sub
188 cycles for 100*fmul
31100 cycles for 100*mulsd


VertexTimings2

Code Select Expand

AMD FX(tm)-8150 Eight-Core Processor            (SSE4)
9 cycles for Vec_SubSSE
15 cycles for Vec_Sub
186 cycles for 100*fmul
30784 cycles for 100*mulsd movlps
145 cycles for 100*mulsd movsd

9 cycles for Vec_SubSSE
15 cycles for Vec_Sub
186 cycles for 100*fmul
30808 cycles for 100*mulsd movlps
145 cycles for 100*mulsd movsd


Regards
Greenhorn

[dedndave]

there are a few out there - google   :P

here's one
http://www.tommesani.com/Docs.html

[Greenhorn__]

Thanks Dave.  :U
...And sorry for my laziness to google it by myself ...  :red


Regards
Greenhorn

[dedndave]

i need to learn MMX and SSE, myself   :bg

[Farabi]

Code Select Expand


MulFPU proc a:real4,b:real4
LOCAL d:dword

fld a
fmul b
fistp d

ret
MulFPU endp

Mulx86 proc a:dword,b:dword

xor edx,edx
mov ecx,a
mov eax,b
mul ecx

ret
Mulx86 endp


Youre right, it has no different. x86 only 16 ms and FPU 29 ms, it has no difference.

[dedndave]

no need to zero EDX for MUL   :P

also - i find that MUL seems to work better if you can put some unrelated instruction just before

Code Select Expand

        mov     ecx,a
        mov     eax,b
        xor     edx,edx
        mul     ecx

[qWord]

what is the sense of comparing a floating point operation with an integer operation?

[Farabi]

what is the sense of comparing a floating point operation with an integer operation?

For the graphic optimizer routine, I though it will be faster if we used integer than floating point, but I just saw if it was the same.