| Line | |
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| 1 | .sect .text; .sect .rom; .sect .data; .sect .bss
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| 2 | .define .fif4
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| 3 |
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| 4 | .sect .text
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| 5 | .fif4:
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| 6 | mov bx,sp
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| 7 | flds 8(bx)
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| 8 | fmuls 12(bx) ! multiply
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| 9 | fld st ! copy result
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| 10 | ftst ! test sign; handle negative separately
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| 11 | fstsw ax
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| 12 | wait
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| 13 | sahf ! result of test in condition codes
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| 14 | jb 1f
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| 15 | frndint ! this one rounds (?)
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| 16 | fcom st(1) ! compare with original; if <=, then OK
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| 17 | fstsw ax
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| 18 | wait
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| 19 | sahf
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| 20 | jbe 2f
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| 21 | fisubs (one) ! else subtract 1
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| 22 | jmp 2f
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| 23 | 1: ! here, negative case
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| 24 | frndint ! this one rounds (?)
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| 25 | fcom st(1) ! compare with original; if >=, then OK
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| 26 | fstsw ax
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| 27 | wait
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| 28 | sahf
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| 29 | jae 2f
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| 30 | fiadds (one) ! else add 1
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| 31 | 2:
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| 32 | fsub st(1),st ! subtract integer part
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| 33 | mov bx,4(bx)
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| 34 | fstps (bx)
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| 35 | fstps 4(bx)
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| 36 | wait
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| 37 | ret
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