Difference between revisions of "Instruction Set/fmad"
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Revision as of 01:34, 3 January 2015
realizing exu stream exu block compute phase operation in the decimal floating point value domain and rounds use current dynamic rounding mode
Decimal floating point fused multiply-add. As usual for those, it yields a higher precision than doing it separately, and is faster too. Uses current rounding behaviour.
operands: like Addd [dd:d]
Returns x*y+z on the belt.
encoding:
fmad(d x)
,
exuArgs(op arg0, op arg1)
| Core | In Slots | [▸] Latencies |
|---|
fmad(d x, d y, d z, d w) → d r0, d r1
operands: like Fmasd [dd:d]
This is a fused multiply-add-subtract. An excellent way to make full use of all Functional Units in the 2 Slots.
r0 is x*y+z*w
r1 is x*y-z*w
encoding:
fmad(d x, d y)
,
exuArgs(op arg0, op arg1)
| Core | In Slots | [▸] Latencies |
|---|
Instruction Set, alphabetical, Instruction Set by Category, Instruction Set, sortable, filterable
