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Adding FMA requirement for LLVM to documentation in what.rst #476

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8 changes: 7 additions & 1 deletion docs/what.rst
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Expand Up @@ -255,7 +255,13 @@ Dr.Jit provides two backends with feature parity:
``drjit.llvm`` or ``drjit.llvm.ad`` (add ``.ad`` if derivative computation is needed).

Note that LLVM >= 11.0 must be installed on your machine for this backend to
be available. LLVM can be installed as follows:
be available. ```x86_64``` support is limited to CPUs with the ```FMA```
instruction set, like Intel Haswell (2013) and AMD Piledriver (2012) and newer. A
patch to emulate ```FMA``` instructions can be found in drjit-core pull request
`59 <https://github.com/mitsuba-renderer/drjit-core/pull/59>`__, but is not
officially supported.

LLVM can be installed as follows:

- **macOS**: Install `Homebrew <https://brew.sh>`__ and then enter the following
command:
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