[PATCH] D88624: [GlobalISel][AArch64] Don't emit cset for G_FCMPs feeding into G_BRCONDs

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
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Similar to the FP case in `AArch64TargetLowering::LowerBR_CC`.

Instead of emitting the csets + a tbnz, just emit a compare + bcc (or two bccs, depending on the condition code)

This improves cases like this: https://godbolt.org/z/v8hebx

This is a 0.1% geomean code size improvement for CTMark at -O3.


https://reviews.llvm.org/D88624

Files:
  llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/fold-brcond-fcmp.mir

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