Publication 1766-RM001A-EN-P - October 2008
Math Instructions 217
Instruction Operation
When the rung is true, this instruction shall compute tangent of the Source
(in radians) and place the result in Destination. If the Destination is
floating point, the result shall always be rounded using the round to even
rule.
MATH FLAGS EFFECTS
• Carry: shall be reset.
• Overflow: shall be set if the result is infinity, or NAN, otherwise
reset.
• Zero: shall be set if the lower 31 bits of float result are all zero
(handles negative zero), otherwise reset.
• Sign: shall be set if the most significant bit of Destination is set (bit
31 for float), otherwise reset.
TAN Instruction Operation
Inputs Conditions Output
Source Type Destination
Type
S:2/14 S:0/3-0
S, Z, V, C
S:5/0 Destination
W,DW, F F X Tan(Source) > 0 0,0,0,0 L Tan(Source)
(1)
DNRM X X X 0,1,0,0 L 0
W,DW, F F X Tan(Source) < 0 1,0,0,0 L Tan(Source)
W,DW, F W, DW X Tan(Source )>= 0.5 && no overflow 0,0,0,0 L Rnd(Tan(Source))
W,DW, F W, DW X -0.5 < Tan(Source) < 0.5 0,1,0,0 L 0
W,DW, F W, DW X Tan(Source) <= 0.5 && no overflow 1,0,0,0 L Rnd(Tan(Source))
(2)
W,DW, F W X Tan(Source) >= 32767.5 0,0,1,0 1 32767
(2)
W,DW, F W X Tan(Source) <= -32768.5 1,0,1,0 1 -32768
(2)
W,DW, F DW X Tan(Source) >= 214748.647.5 0,0,1,0 1 2147483647
(2)
W,DW, F DW X Tan(Source) <= -214748.648.5 1,0,1,0 1 -2147483648
(3)
X F X Source is NAN or INF 0,0,1,0 1 0x7FFFFFFF
(4)
X W X Source is NAN or INF 0,0,1,0 1 32767
(4)
X DW X Source is NAN or INF 0,0,1,0 1 2147483647
(1) All denormalized inputs shall be treated as plus zero. Any underflow result shall produce plus zero.
(2) If the Destination is word or double-word and an overflow occurs(except source is NAN or INF):
If the result is positive, Destination is 32767 for Word and 2147483647 for Double Word. If the result is negative, Destination is -32768 for Word and -2147483648 for
Double Word.
(3) If the Destination is floating point, all overflows(Source is NAN or infinity) shall produce NAN(0x7FFFFFFF).
(4) If Destination is an integer, the Source is NAN or infinity, a saturated result (32767 for Word and 2147483647 for Double Word) shall be stored
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