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add some wrapped ops and some notes #86

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add some wrapped ops and some notes #86

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27 changes: 17 additions & 10 deletions arc-0004/README.md
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Expand Up @@ -26,28 +26,34 @@ corresponding to the Aleo Instructions that can halt.

## Specification

Each flagged operation is identical to the current halting instruction
except it doesn't halt and it returns another return value that is a
boolean.
Each flagged operation is identical to its corresponding current operation
when called with arguments that would be nonhalting, except it returns
a second return value of type boolean that is **false** (meaning that the
current operation would not have halted). When called with arguments
that would have been halting, it generally returns 0 (of the appropriate
output type) and **true** ("would have halted") for the second return value.

The flagged operations are different from wrapped (e.g. `abs.w`) or
lossy (e.g. `cast.lossy`) operations. It is important that the flagged
operation have the same semantics as the current halting instruction
except for the halting behavior and extra return value, for ease of
use by compilers.

| Current Halting Opcode | New Flagged Opcode |
|:-------------------:|:-----------------------:|
| Current Halting Opcode | New Flagged Opcode | notes |
|:-------------------:|:-----------------------:|:--------------------------:|
| abs | abs.flagged |
| add | add.flagged |
| cast | cast.flagged |
| assert.eq | is.eq | We don't need a separate assert.(n)eq.flagged;
| assert.neq | is.neq | instead, just use the existing is.(n)eq
| cast | cast.flagged | as of now, docs don't say what causes cast to halt
| commit.bhp256 | commit.bhp256.flagged |
| commit.bhp512 | commit.bhp512.flagged |
| commit.bhp768 | commit.bhp768.flagged |
| commit.bhp768 | commit.bhp1024.flagged |
| commit.ped64 | commit.ped64.flagged |
| commit.ped128 | commit.ped128.flagged |
| div | div.flagged |
| div | div.flagged | div can halt on underflow and divide by zero
| div.w | div.w.flagged | div.w can halt on divide by zero
| hash.bhp256 | hash.bhp256.flagged |
| hash.bhp512 | hash.bhp512.flagged |
| hash.bhp768 | hash.bhp768.flagged |
Expand All @@ -59,9 +65,10 @@ use by compilers.
| mul | mul.flagged |
| neg | neg.flagged |
| pow | pow.flagged |
| rem | rem.flagged |
| shl | shl.flagged |
| shr | shr.flagged |
| rem | rem.flagged | rem can halt on underflow and divide by zero
| rem.w | rem.w.flagged | rem.w can halt on divide by zero
| shl | shl.flagged | as of now, docs don't say what causes
| shr | shr.flagged | shl or shr to halt
| sqrt | sqrt.flagged |
| sub | sub.flagged |

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