[hatari-devel] Bug in FPU code

[Andreas Grabher <andreas.grabher@xxxxxxxxxxxx>]

While working on Previous i found a bug in the FPU code and fixed it. This makes the FPU pass NeXT's power-on test using 68040 with its internal FPU. 68030/68882 still not working but getting to the next stage now.

I appended the patch to this message.
As i am still new to coding, please check the code before applying the patch.

Regards,

Andreas


diff -crB /Users/andi/Desktop/branch_scsiold/src/cpu/md-fpp.h /Users/andi/Desktop/branch_scsi/src/cpu/md-fpp.h
*** /Users/andi/Desktop/branch_scsiold/src/cpu/md-fpp.h	2011-12-14 19:29:29.000000000 +0100
--- /Users/andi/Desktop/branch_scsi/src/cpu/md-fpp.h	2012-03-05 19:09:33.000000000 +0100
***************
*** 33,41 ****
  STATIC_INLINE void from_exten(long double src, uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3)
  {
      register uae_u32 *longarray = (uae_u32 *)&src;
!     register uae_u16 *finalword = (uae_u16 *)(&src + 8);
  
!     *wrd1 = ((uae_u32)*finalword)<<16;
      *wrd2 = longarray[1];
      *wrd3 = longarray[0]; // little endian
  }
--- 33,42 ----
  STATIC_INLINE void from_exten(long double src, uae_u32 * wrd1, uae_u32 * wrd2, uae_u32 * wrd3)
  {
      register uae_u32 *longarray = (uae_u32 *)&src;
! //    register uae_u16 *finalword = (uae_u16 *)(&src + 8);
  
! //    *wrd1 = ((uae_u32)*finalword)<<16;
!     *wrd1 = (longarray[2] & 0xffff)<<16;
      *wrd2 = longarray[1];
      *wrd3 = longarray[0]; // little endian
  }