arch/m68k-all/libgcc1/_floatsidf.s

   1 | long integer to double float conversion routine
   2 |
   3 | written by Kai-Uwe Bloem (I5110401@dbstu1.bitnet).
   4 | Based on a 80x86 floating point packet from comp.os.minix, written by P.Housel
   5 |
   6 |
   7 | Revision 1.2, kub 01-90 :
   8 | added support for denormalized numbers
   9 |
  10 | Revision 1.1, kub 12-89 :
  11 | Ported over to 68k assembler
  12 |
  13 | Revision 1.0:
  14 | original 8088 code from P.S.Housel
  15
  16 BIAS8   =       0x3FF-1
  17
  18         .text
  19         .even
  20         .globl  __floatsidf
  21
  22 __floatsidf:
  23         movel   %sp@(4),%d0     | get the 4-byte integer
  24         moveml  %d2-%d7,%sp@-   | save registers to make norm_df happy
  25
  26         movel   %d0,%d4         | prepare result mantissa
  27         clrl    %d5
  28         movew   #BIAS8+32-11,%d0        | radix point after 32 bits
  29 L_0:
  30         movel   %d4,%d2         | set sign flag
  31         swap    %d2
  32         tstw    %d2             | check sign of number
  33         bge     L_1             | nonnegative
  34         negl    %d4             | take absolute value
  35 L_1:
  36         clrw    %d1             | set rounding = 0
  37         jmp     norm_df