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alexcrichton merged 1 commit into from
Sep 5, 2024
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Add some links to issue discussion from the overview #16

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10 changes: 10 additions & 0 deletions proposals/128-bit-arithmetic/Overview.md
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Expand Up @@ -226,6 +226,12 @@ plaininstr_l ::= ...

### Alternative: Overflow Flags

> **Note**: this alternative is the subject of [#6] and this section is intended
> to summarize investigations and results of that issue. See [#6] for more
> in-depth discussion too.

[#6]: https://github.com/WebAssembly/128-bit-arithmetic/issues/6

A major alternative to this proposal is to expose the lower-level primitives
that 128-bit addition/subtraction are themselves built on for the underlying
platforms. This hypothetically would remove the need for `i64.{add,sub}128`. The
Expand Down Expand Up @@ -371,6 +377,10 @@ registers.

### Alternative: Why not add `i64.div128_{u,s}`?

> **Note**: this section is also being discussed in [#15].

[#15]: https://github.com/WebAssembly/128-bit-arithmetic/issues/15

Native ISAs generally do not have support for 128-bit division. The x86-64 ISA
has the ability to divide a 128-bit value by a 64-bit value producing a 64-bit
result, but this doesn't map to the desired semantics of `i64.div128_{u,s}` to
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