Ryan Cowan ad1a45b903 [AArch64] Use GISel for optnone functions (#174746) ...

Currently, when SDAG is run on AArch64 and an `optnone` function is
encountered, the selector is chosen as FastISel. AArch64 makes use of
GlobalISel at O0 and this patch aims to align `optnone` with this
functionality.

A flag is exposed to enable this functionality for a given backend but,
as AArch64 is currently the only backend I could find using GlobalISel
at O0 this is the only one with it implemented. This flag is set when
the target supports GlobalISel & GlobalISel hasn't been forced by the
user, the target machine or by being at an optimisation level lower than
`EnableGlobalISelAtO`.

If this happens, the GlobalISel passes are included as shown in
`llvm/test/CodeGen/AArch64/O3-pipeline.ll` and skipped by IRTranslator
for functions not marked as `optnone`.

In updating the tests based on this functionality, I found some unused
check lines or run lines that mixed SDAG with GlobalISel pass names
which have been fixed.

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Co-authored-by: Matt Arsenault <arsenm2@gmail.com>

2026-01-29 16:30:22 +00:00

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