[PATCH] D99467: [AVR] Fix a bug in prologue of ISR

[Ben Shi via Phabricator via llvm-commits]

benshi001 added a comment.

avr-gcc does

1. use r0 as tmp_reg to save/restore SREG
2. clear r1 and then use it as zero_reg

but llvm clears r0 instead of expected r1.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D99467/new/

https://reviews.llvm.org/D99467