narrowfn

realizing  exu stream  exu block  compute phase   operation   in the binary floating point value domain   and rounds toward negative infinity

native on: Silver Gold

Half the width of a binary float value. Rounding towards negative infinity.

Can produce the IEEE 754 16bit binary float interchange format.

This is not a Speculable operation. The reason for this is the impossibility to fit all of the NaR payload into values smaller than 32bit. Nominally this would only require the narrowing of 32bit values to be not speculable, but for simplicity reasons in hardware and compiler this is not so. If narrowing should prove a big bottleneck this can be revisited.

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narrowfn(f v) → f r0

operands: like Narrowf [ff:½f]

Core	In Slots	Latencies
Silver	E0 E1	w:h=3 d:w=4 q:d=5
Gold	E0 E1 E2 E3	w:h=3 d:w=4 q:d=5

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narrowfn(f v1, f v2) → f r0

operands: like Narrowvf [FF:½F]

Core	In Slots	Latencies
Silver	E0 E1	wv,wv:hv=3 dv,dv:wv=4 qv,qv:dv=5
Gold	E0 E1 E2 E3	wv,wv:hv=3 dv,dv:wv=4 qv,qv:dv=5

Instruction Set, alphabetical, Instruction Set by Category, Instruction Set, sortable, filterable