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Consistent naming conventions for signedness, addendum #332

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rossberg merged 1 commit into from
Sep 5, 2015
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Consistent naming conventions for signedness, addendum #332

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8 changes: 4 additions & 4 deletions AstSemantics.md
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Expand Up @@ -382,8 +382,8 @@ results into the result type.
* `int32.ior`: sign-agnostic inclusive or
* `int32.xor`: sign-agnostic exclusive or
* `int32.shl`: sign-agnostic shift left
* `int32.shr`: sign-agnostic logical shift right
* `int32.sar`: sign-agnostic arithmetic shift right
* `int32.shr_u`: zero-replicating (logical) shift right
* `int32.shr_s`: sign-replicating (arithmetic) shift right
* `int32.eq`: sign-agnostic compare equal
* `int32.ne`: sign-agnostic compare unequal
* `int32.lt_s`: signed less than
Expand All @@ -399,8 +399,8 @@ results into the result type.
* `int32.popcnt`: sign-agnostic count number of one bits

Shifts interpret their shift count operand as an unsigned value. When the shift
count is at least the bitwidth of the shift, `shl` and `shr` produce `0`, and
`sar` produces `0` if the value being shifted is non-negative, and `-1`
count is at least the bitwidth of the shift, `shl` and `shr_u` produce `0`, and
`shr_s` produces `0` if the value being shifted is non-negative, and `-1`
otherwise.

All comparison operations yield 32-bit integer results with `1` representing
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