diff options
| author | Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp> | 2022-10-22 07:46:13 +0900 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-10-22 00:23:02 -0700 |
| commit | e0927d7ddca154b1a5151da698e205593cb8912e (patch) | |
| tree | 3d3ed9ce0c0c552d6c5899acc81d698840f7ecdd /gcc/value-range.cc | |
| parent | 1043971957af092e265cc4553b2382398d7308ae (diff) | |
| download | gcc-e0927d7ddca154b1a5151da698e205593cb8912e.zip gcc-e0927d7ddca154b1a5151da698e205593cb8912e.tar.gz gcc-e0927d7ddca154b1a5151da698e205593cb8912e.tar.bz2 | |
xtensa: Make register A0 allocable for the CALL0 ABI
This patch offers an additional allocable register by RA for the CALL0
ABI.
> Register a0 holds the return address upon entry to a function, but
> unlike the windowed register ABI, it is not reserved for this purpose
> and may hold other values after the return address has been saved.
- Xtensa ISA Reference Manual,
8.1.2 "CALL0 Register Usage and Stack Layout" [p.589]
gcc/ChangeLog:
* config/xtensa/xtensa.cc (xtensa_conditional_register_usage):
Remove register A0 from FIXED_REGS if the CALL0 ABI.
(xtensa_expand_epilogue): Change to emit '(use (reg:SI A0_REG))'
unconditionally after restoring callee-saved registers for
sibling-call functions, in order to prevent misleading that
register A0 is free to use.
Diffstat (limited to 'gcc/value-range.cc')
0 files changed, 0 insertions, 0 deletions