Float point in 64bit

[GUAN DE DIO]

Hi everybody,

     Working on GDI+ I need to make some floating operation to draw somethings.

     Currently I need to make the translation of Polar coordinate to Cartesian Coordinates.  In 32bits I used the FPU instruction, but in 64bit I don't know what is wrong in my code.

      I try to check it using IDA 5.2 Debugger and my surprise when the instructions :
    -  FINIT
    -  FLD1
     
       didn't  do anything, the ST0 register is always set to 0.0

    I miss something?

   I'm working with MASM64.

Thanks in advance,
GUAN

[qWord]

      I try to check it using IDA 5.2 Debugger and my surprise when the instructions :
    -  FINIT
    -  FLD1
     
       didn't  do anything, the ST0 register is always set to 0.0

mainly a problem by IDA.

[GUAN DE DIO]

   I have used windbg and all is right now.

  But, is there another debugger for 64bits more frendly?

Thanks,
GUAN

[D.F.]

I have used windbg and all is right now.
But, is there another debugger for 64bits more frendly?

FDBG - fdbg for AMD64 is assembler level debugger for user-mode (ring3) binary applications, running in long mode (64-bit).

[GregL]

Visual C++ 2008 or 2010 debugger, even the Express Edition debugs 64-bit (on 64-bit OS).