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@ -62,30 +62,39 @@ Arithmetic and other operations set status flags that can be used for conditiona |
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- Negative … Value is negative |
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- Negative … Value is negative |
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- Overflow … Arithmetic overflow or underflow, buffer underflow, etc. |
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- Overflow … Arithmetic overflow or underflow, buffer underflow, etc. |
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- Invalid … Invalid arguments for an instruction |
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- Invalid … Invalid arguments for an instruction |
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- Carry … Arithmetic carry *this is currently unused* |
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- Carry … Arithmetic carry; used by extensions (currently unused, planned for the byte/halfword/word versions of the arith module) |
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- Full … full condition; used by extensions |
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- Empty … empty condition; used by extensions |
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- EOF … end of a stream, file, etc; used by extensions |
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### Status tests (conditions) |
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### Status tests (conditions) |
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These keywords (among others) are used in conditional branches to specify flag tests: |
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These keywords (among others) are used in conditional branches to specify flag tests: |
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- `eq` … Equal, |
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- `eq` … Equal |
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- `ne` … NotEqual, |
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- `ne` … NotEqual |
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- `z` … Zero, |
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- `z` … Zero |
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- `nz` … NotZero, |
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- `nz` … NotZero |
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- `lt` … Lower, |
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- `lt` … Lower |
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- `le` … LowerOrEqual, |
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- `le` … LowerOrEqual |
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- `gt` … Greater, |
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- `gt` … Greater |
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- `ge` … GreaterOrEqual, |
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- `ge` … GreaterOrEqual |
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- `pos` … Positive, |
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- `pos` … Positive |
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- `neg` … Negative, |
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- `neg` … Negative |
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- `npos` … NonPositive, |
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- `npos` … NonPositive |
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- `nneg` … NonNegative, |
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- `nneg` … NonNegative |
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- `c` … Carry, |
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- `c` … Carry |
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- `nc` … NotCarry, |
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- `nc` … NotCarry |
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- `val`, `valid`, `ok` … Valid, |
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- `val`, `valid`, `ok` … Valid |
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- `inval`, `nok` … Invalid, |
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- `inval`, `nok` … Invalid |
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- `ov` … Overflow, |
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- `ov` … Overflow |
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- `nov` … NotOverflow, |
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- `nov` … NotOverflow |
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- `f`, `full` … Full |
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- `nf`, `nfull` … Not full |
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- `em`, `empty` … Empty |
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- `nem`, `nempty` … Not empty |
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- `eof` … EOF |
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- `neof` … Not EOF |
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# Syntax |
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# Syntax |
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@ -561,6 +570,8 @@ such as animations. |
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- They operate over unicode code points, which are a superset of ASCII. |
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- They operate over unicode code points, which are a superset of ASCII. |
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- The "_r" variants work with raw bytes. Do not combine them, or you may get problems with multi-byte characters. |
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- The "_r" variants work with raw bytes. Do not combine them, or you may get problems with multi-byte characters. |
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End of stream is reported by the 'eof' status flag when a stream is read or written. |
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You can use these special handles in almost all instructions: |
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You can use these special handles in almost all instructions: |
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```lisp |
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```lisp |
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