alternative to movd

[daydreamer]

Hi
SSE xmm regs<> gp regs is simple use Movd
But fpu regs <> gp regs you need go thru memory storage
My idea is to try this
Push eax
; after fpu calculation
Fistp [esp+something ]
;want to store result on stack so
Pop eax ;eax = [esp+something ]
But I have too little experience with stack tricks

[Caché GB]

Hi daydreamer

Try this.

Code Select Expand

local  MyReal4:real4

            mov  eax, FLT4(123.456)
           push  eax
            fld  dword ptr[esp]

           fchs

           fstp  dword ptr[esp]
            pop  eax

            mov  MyReal4, eax


[jj2007]

Here's one more, pure Masm32 SDK code (full source attached):

Code Select Expand

  rdtsc
  push edx
  push eax
  fild qword ptr [esp]
  invoke Sleep, 1000
  rdtsc
  push edx
  push eax
  fild qword ptr [esp]
  fsubr
  fdiv FP8(1048576.0)    ; ->mega
  fistp result

[NoCforMe]

Doesn't that leave the stack unbalanced? Four PUSHes and no POPs.

[jj2007]

An almost valid point

[NoCforMe]

Look, I'm not gonna download a .zip file every time I see something posted here. Life's too short for that.

[jj2007]

Maybe you shouldn't waste so much of your precious life time on thread drift

[daydreamer]

Thanks Cache gb,jochen 
Thread drift in forum in Sydney = Sydney drift, instead of Tokyo drift? 

[NoCforMe]

Thread drift in forum in Sydney = Sydney drift, instead of Tokyo drift? 

Continental drift. Plate tectonics.