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BasicCABI.md: add a note about emscripten long double alignment #226

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dschuff merged 1 commit into from
Apr 12, 2024
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BasicCABI.md: add a note about emscripten long double alignment #226

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2 changes: 2 additions & 0 deletions BasicCABI.md
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ General type | C Type | `sizeof` | Alignment (bytes) | Wasm Value Type
Floating point | `float` | 4 | 4 | f32
Floating point | `double` | 8 | 8 | f64
Floating point | `long double` | 16 | 16 | (none)
Floating point | `long double` (Emscripten) | 16 | 8 | (none)

* `long double` values correspond to 128-bit IEEE-754 quad-precision binary128 values.
Operations on these values are currently implemented as calls to
Expand All @@ -54,6 +55,7 @@ General type | C Type | `sizeof` | Alignment (bytes) | Wasm Value Type
by an `unsigned int`.
Otherwise, if a compiler supports such an `enum`, it would use `i64`
for the `enum`.
* Emscripten uses 8 byte alignment for `long double`.

**Aggregates and Unions**

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