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ac_types #52

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drom opened this issue Feb 14, 2019 · 0 comments

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drom commented Feb 14, 2019 •

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Add support for ac_types

ac_int<W,S>

W - width of the number (non-negative interger number)
S - signed number (bool flag)

Type	Numerical range	Quantum
`{W: 1, S: false}`	0..1	1
`{W: 1, S: true}`	-1..0	1
`{W: 4, S: false}`	0..15	1
`{W: 4, S: true}`	-8..7	1

ac_int<W, S> === ac_fixed<W, W, S>

ac_fixed<W, I, S, Q, O>

W - width of the number (non-negative interger number)
I - integer width (non-negative interger number)
S - signed number (bool flag)
Q - rounding (bool flag)
O - overflow (bool flag)

Type	Numerical range	Quantum
`{W: 4, I: 4, S: false}`	0..15	1
`{W: 4, I: 4, S: true}`	-8..7	1
`{W: 4, I: 6, S: false}`	0..60	4
`{W: 4, I: 6, S: true}`	-32..28	4
`{W: 4, I: 0, S: false}`	0..15/16	1/16
`{W: 4, I: 0, S: true}`	-1/2..7/16	1/16
`{W: 4, I: -1, S: false}`	0..15/32	1/32
`{W: 4, I: -1, S: true}`	-0.25..7/32	1/32

ac_float<W, I, E, Q>

W - width of mantissa (non-negative interger number)
I - integer width (non-negative interger number)
E - exponent (non-negative interger number)
Q - rounding (bool flag)

Type	Numerical range	Quantum
`{W: 54, I: 2, E: 11}`	IEEE 754 double
`{W: 25, I: 2, E: 8}`	IEEE 754 float
`{W: 12, I: 2, E: 5}`	IEEE 754 half

❓ should width be W+E-1 ❓

ac_complex

C: true flag makes two part complex number.

Type	Numerical range	Quantum
`{W: 8, I: 4, S: false, C: true}`	0..15	1

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