Sander de Smalen be15fd5085 [InitUndef] handleSubReg should skip artificial subregs. (#116248) ...

When enabling subreg liveness tracking for AArch64, this pass fails
because it tries to get the register class for the artificial subreg
`sub_32_hi` of a 64-bit GPR. It tries to create an INIT_UNDEF
instruction for the top 32-bits of the 64-bit GPR, which are not
directly addressable, so getSubRegisterClass() returns a nullptr,
crashing this pass.

It should instead just avoid trying to create the INIT_UNDEF
instruction.

2024-11-14 17:06:40 +00:00

9.5 KiB

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