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[AArch64] Update LangRef to reference GHC calling convention #72760

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Dec 3, 2023
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[AArch64] Update LangRef to reference GHC calling convention #72760

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13 changes: 8 additions & 5 deletions llvm/docs/LangRef.rst
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Expand Up @@ -317,13 +317,16 @@ added in the future:
not be used lightly but only for specific situations such as an
alternative to the *register pinning* performance technique often
used when implementing functional programming languages. At the
moment only X86 supports this convention and it has the following
limitations:
moment only X86 and AArch64 support this convention. The following
limitations exist:

- On *X86-32* only supports up to 4 bit type parameters. No
- On *X86-32* only up to 4 bit type parameters are supported. No
floating-point types are supported.
- On *X86-64* only supports up to 10 bit type parameters and 6
floating-point parameters.
- On *X86-64* only up to 10 bit type parameters and 6
floating-point parameters are supported.
- On *AArch64* only up to 4 32-bit floating-point parameters,
4 64-bit floating-point parameters, and 10 bit type parameters
are supported.

This calling convention supports `tail call
optimization <CodeGenerator.html#tail-call-optimization>`_ but requires
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