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Clarify br_table

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From comments in
https://github.com/CraneStation/cranelift/issues/101#issuecomment-461284555
This commit is contained in:
Rett Berg
2019-02-06 22:05:06 -08:00
committed by Dan Gohman
parent 9f9c306091
commit 68479e6115
1 changed files with 6 additions and 0 deletions
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6
cranelift/codegen/meta-python/base/instructions.py
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@@ -143,6 +143,12 @@ br_table = Instruction(
Note that this branch instruction can't pass arguments to the targeted Note that this branch instruction can't pass arguments to the targeted
blocks. Split critical edges as needed to work around this. blocks. Split critical edges as needed to work around this.
Do not confuse this with "tables" in WebAssembly. ``br_table`` is for
jump tables with destinations within the current function only -- think
of a ``match`` in Rust or a ``switch`` in C. If you want to call a
function in a dynamic library, that will typically use
``call_indirect``.
""", """,
ins=(x, EBB, JT), is_branch=True, is_terminator=True) ins=(x, EBB, JT), is_branch=True, is_terminator=True)