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<TITLE>Int 3E
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Int 3E - FLOATING POINT EMULATION - Borland LANGUAGES SHORTCUT CALL -
Notes: the two bytes following the INT 3E instruction are the subcode
(see #03195) and a NOP (90h), except for subcodes DCh and DEh, where
the second byte is a register count (01h-08h)
this vector is modified but not restored by Direct Access v4.0, and
may be left dangling by other programs written with the same version
of compiled BASIC
SeeAlso: INT 3D
(Table 03195)
Values for Borland floating-point shortcut subcode:
">
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<h2>Int 3E
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<h3><font color=#C00040>FLOATING POINT EMULATION - Borland LANGUAGES SHORTCUT CALL</font></h3>
<p><b>Notes:</b>
The two bytes following the INT 3E instruction are the subcode
<a href="rb-6128.htm#Table3195" tppabs="http://www.ctyme.com/intr/rb-6128.htm#Table3195">(see #03195)</a> and a NOP (90h), except for subcodes DCh and DEh, where
the second byte is a register count (01h-08h).
This vector is modified but not restored by Direct Access v4.0, and
may be left dangling by other programs written with the same version
of compiled BASIC
<p><b>See Also:</b>
<a href="rb-6127.htm" tppabs="http://www.ctyme.com/intr/rb-6127.htm">INT 3D</a>
<PRE>
<p>
<a name=table3195></a>
(Table 03195)
Values for Borland floating-point shortcut subcode:
Subcode Function
DCh load 8086 stack with 8087 registers; overwrites the 10*N bytes at the
top of the stack prior to the INT 3E with the 8087 register contents
DEh load 8087 registers from top of 8086 stack; ST0 is furthest from top
of 8086 stack
E0h round TOS and R1 to single precision, compare, pop twice
returns AX=8087 status word, FLAGS=8087 condition bits
E2h round TOS and R1 to double precision, compare, pop twice
returns AX=8087 status word, FLAGS=8087 condition bits.
</PRE>
<p><b>Note:</b>
Buggy in TPas5.5, because it sets the 8087 precision control
field to the undocumented value 01h; this results in actually
rounding to single precision
E4h compare TOS/R1 with two POP's
returns FLAGS=8087 condition bits
E6h compare TOS/R1 with POP
returns FLAGS=8087 condition bits
E8h FTST (check TOS value)
returns FLAGS=8087 condition bits
EAh FXAM (check TOS value)
returns AX=8087 status word
ECh sine(ST0)
EEh cosine(ST0)
F0h tangent(ST0)
F2h arctangent(ST0)
F4h ST0 = ln(ST0)
F6h ST0 = log2(ST0)
F8h ST0 = log10(ST0)
FAh ST0 = e**ST0
FCh ST0 = 2**ST0
FEh ST0 = 10**ST0
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