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Add br_if and br_switch. #403

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Add br_if and br_switch. #403

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5 changes: 5 additions & 0 deletions AstSemantics.md
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Expand Up @@ -246,6 +246,11 @@ are statements.
* `break`: break to end from nested loop or block
* `return`: return zero or more values from this function
* `switch`: switch statement with fallthrough
* `br_if`: conditional branch to end from nested loop or block
* `br_switch`: a list of pairs of nested loop or block references and
immediate indices, a default loop or block reference, and an index operand.
Branch to the end of the indexed loop or block if in bounds, otherwise the
default loop or block

Loops (`do_while` and `forever`) may only be entered via fallthrough at the top.
In particular, loops may not be entered directly via a `break`, `continue`, or
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