Hi, Preventing decomposition if modes are not tieable is necessary to stop AArch64 partial Neon structure modes being treated as packed in registers.
This is a necessary prerequisite for a future AArch64 PCS change to
maintain good code generation.
Bootstrapped and regression tested on:
* x86_64-pc-linux-gnu - no issues.
* aarch64-none-linux-gnu - two test failures which will be fixed by
the next patch in this series.
Ok for master?
Thanks,
Jonathan
---
gcc/ChangeLog:
2021-10-14 Jonathan Wright <jonathan.wri...@arm.com>
* lower-subreg.c (simple_move): Prevent decomposition if
modes are not tieable.
rb14936.patch
Description: rb14936.patch
