Utaperla
Utaperla is a genus of green stoneflies in the family Chloroperlidae. There are at least four described species in Utaperla.[1][2][3][4]
| Utaperla | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Plecoptera |
| Family: | Chloroperlidae |
| Subfamily: | Paraperlinae |
| Genus: | Utaperla Ricker, 1952 |
Species
These four species belong to the genus Utaperla:
- Utaperla gaspesiana Harper & Roy, 1975 (gaspe sallfly)
- Utaperla lepnevae (Zhiltzova, 1970)
- Utaperla orientalis Nelson & Hanson, 1969
- Utaperla sopladora Ricker, 1952
gollark: I think this is technically possible to implement, so bee⁻¹ you.
gollark: This is underspecified because bee² you, yes.
gollark: All numbers are two's complement because bee you.
gollark: The rest of the instruction consists of variable-width (for fun) target specifiers. The first N target specifiers in an operation are used as destinations and the remaining ones as sources. N varies per opcode. They can be of the form `000DDD` (pop/push from/to stack index DDD), `001EEE` (peek stack index EEE if source, if destination then push onto EEE if it is empty), `010FFFFFFFF` (8-bit immediate value FFFFFFFF; writes are discarded), `011GGGGGGGGGGGGGGGG` (16-bit immediate value GGGGGGGGGGGGGGGG; writes are also discarded), `100[H 31 times]` (31-bit immediate because bee you), `101IIIIIIIIIIIIIIII` (16 bits of memory location relative to the base memory address register of the stack the operation is conditional on), `110JJJJJJJJJJJJJJJJ` (16 bit memory location relative to the top value on that stack instead), `1111LLLMMM` (memory address equal to base memory address of stack LLL plus top of stack MMM), or `1110NNN` (base memory address register of stack MMM).Opcodes (numbered from 0 in order): MOV (1 source, as many destinations as can be parsed validly; the value is copied to all of them), ADD (1 destination, multiple sources), JMP (1 source), NOT (same as MOV), WR (write to output port; multiple sources, first is port number), RE (read from input port; one source for port number, multiple destinations), SUB, AND, OR, XOR, SHR, SHL (bitwise operations), MUL, ROR, ROL, NOP, MUL2 (multiplication with two outputs).
gollark: osmarksISA™️-2028 is a VLIW stack machine. Specifically, it executes a 384-bit instruction composed of 8 48-bit operations in parallel. There are 8 stacks, for safety. Each stack also has an associated base memory address register, which is used in some "addressing modes". Each stack holds 64-bit integers; popping/peeking an empty stack simply returns 0, and the stacks can hold at most 32 items. Exceeding a stack's capacity is runtime undefined behaviour. The operation encoding is: `AABBBCCCCCCCCC`:A = 2-bit conditional operation mode - 0 is "run unconditionally", 1 is "run if top value on stack is 0", 2 is "run if not 0", 3 is "run if first bit is ~~negative~~ 1".B = 3-bit index for the stack to use for the conditional.C = 9-bit opcode (for extensibility).
References
- "Utaperla Report". Integrated Taxonomic Information System. Retrieved 2019-09-24.
- "Utaperla". GBIF. Retrieved 2019-09-24.
- "Utaperla genus Information". BugGuide.net. Retrieved 2019-09-24.
- DeWalt, R.E.; Maehr, M.D.; Neu-Becker, U.; Stueber, G. (2019). "genus Utaperla Ricker, 1952". Plecoptera species file online, Version 5.0. Retrieved 2019-07-02.
Further reading
- Campbell, Ian C., ed. (1990). Mayflies and Stoneflies: Life Histories and Biology. Springer. doi:10.1007/978-94-009-2397-3. ISBN 978-94-010-7579-4.
- Stewart, Kenneth W.; Stark, Bill P. (1988). Nymphs of North American stonefly genera (Plecoptera). Entomological Society of America. ISBN 978-0929398556.
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