From: nowhere@nospicedham.never.at   
      
   On 06.08.2021 19:11, R.Wieser wrote:   
      
   > 2) How do I, for debugging purposes, check the FPU stack ?   
      
   not every debug tool supports FPU. I had to write my own debugger   
   anyway and it uses FXSAVE to show registers and all status bits.   
      
   but how did you check 1)  FSTCW ? FXAM/r ? FSTENV ? FSTSW AX ?   
   too many consecutive fstp will cause stack errors.   
      
   The FNSTCW instruction does not check for possible floating-point   
   exceptions before copying the image of the x87 status register.   
      
   FCLEX or FXSAVE followed by FINIT work fine for me to clean up.   
   and FFREE/r is my way to empty a specific register.   
      
   I actually hate this stupid stack-up/dn design, an overall ST(n)   
   would work just fine with much lesser doubtful quirks.   
   meanwhile we got SSE/AVX and AMD may remove FPU from chip soon.   
   __   
   wolfgang   
      
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