John Brawn 8211cfb7c8 [ARM] Don't shrink STM if it would cause an unknown base register store ...

If a 16-bit thumb STM with writeback stores the base register but it isn't the
first register in the list, then an unknown value is stored. The load/store
optimizer knows this and generates a 32-bit STM without writeback instead, but
thumb2 size reduction converts it into a 16-bit STM. Fix this by having thumb2
size reduction notice such STMs and leave them as they are.

Differential Revision: https://reviews.llvm.org/D78493

2020-04-22 14:50:42 +01:00

40 KiB

Raw Blame History

View Raw