Jirui Wu bb0403ae2e [ARM] Remove redundant BTI instructions for table jumps ...

A BTI instruction was previously inserted at the beginning of each block
that has its address stored in a jump table. Jump tables only emit
indirect jumps in ARM or Thumb1 modes. However, PACBTI is not supported
in these modes. As a result, BTI instructions emitted by jump tables are
redundant. Removing redundant BTI instructions improves the code size
and prevents potential gadgets.

Differential Revision: https://reviews.llvm.org/D144470

2023-02-24 10:32:30 +00:00

4.7 KiB

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