[PATCH] D135078: [AArch64][GlobalISel] Fold away lowered vector sign-extend of vector compares

[Jessica Paquette via Phabricator via llvm-commits]

paquette added a comment.

Why can't this be caught pre-legalize?



================
Comment at: llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerCombiner.cpp:368
+
+static void applySextViaShiftsOfVCmp(MachineInstr &MI, MachineRegisterInfo &MRI,
+                                     MachineIRBuilder &B,
----------------
`replaceSingleDefInstWithReg`?


Repository:
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https://reviews.llvm.org/D135078