[flang-commits] [flang] [flang] IEEE underflow control for Arm (PR #124170)

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https://github.com/jeanPerier commented:

Not the expert here, but code looks good to me.
One question looking at [ARM doc](https://developer.arm.com/documentation/ddi0601/2024-12/AArch64-Registers/FPCR--Floating-point-Control-Register) for FPCR.FZ, does FPCR.AH also needs to be set to 0 or 1 to get the expected IEEE behavior (it looks like it impacts the flushing of fp operation inputs in the FZ doc)?

FPCR.AH seems to also impacts the rounding (RMode), so maybe modifying it here is a bad idea.

https://github.com/llvm/llvm-project/pull/124170