[PATCH] D99675: RFC [llvm][clang] Create new intrinsic llvm.arith.fence to control FP optimization at expression level

[Melanie Blower via Phabricator via llvm-commits]

mibintc added a comment.

In D99675#2695424 <https://reviews.llvm.org/D99675#2695424>, @kpn wrote:

> What changes are needed for a backend, and what happens if they aren't done?

In the clang patch, I'm planning to add into TargetInfo a function like "does the target support __arithmetic_fence"?
In the llvm patch, the fallback implementation could be to merely ignore the call, and pass through the operand value. Is that adequate?


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