LoongArch: Fix bug in loongarch_emit_stack_tie [PR110484].
Which may result in implicit references to $fp when frame_pointer_needed is false,
causing regs_ever_live[$fp] to be true when $fp is not explicitly used,
resulting in $fp being used as the target replacement register in the rnreg pass.
The bug originates from SPEC2017 541.leela_r(-flto).
gcc/ChangeLog:
PR target/110484
* config/loongarch/loongarch.cc (loongarch_emit_stack_tie): Use the
frame_pointer_needed to determine whether to use the $fp register.
Co-authored-by: Guo Jie <guojie@loongson.cn>
(cherry picked from commit
1967f21d000e09d3d3190317af7923b578ce02b1)
git://gcc.gnu.org / gcc.git / commit