diff options
Diffstat (limited to '0184-Backport-SME-aarch64-Explicitly-handle-frames-with-n.patch')
| -rw-r--r-- | 0184-Backport-SME-aarch64-Explicitly-handle-frames-with-n.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/0184-Backport-SME-aarch64-Explicitly-handle-frames-with-n.patch b/0184-Backport-SME-aarch64-Explicitly-handle-frames-with-n.patch new file mode 100644 index 0000000..3af28ed --- /dev/null +++ b/0184-Backport-SME-aarch64-Explicitly-handle-frames-with-n.patch @@ -0,0 +1,51 @@ +From 82bbe6513987a7656150110164e25f44fe410796 Mon Sep 17 00:00:00 2001 +From: Richard Sandiford <richard.sandiford@arm.com> +Date: Tue, 12 Sep 2023 16:05:05 +0100 +Subject: [PATCH 085/157] [Backport][SME] aarch64: Explicitly handle frames + with no saved registers + +Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=c601c918c9ac01ef8315774a642ff924f77c85e5 + +If a frame has no saved registers, it can be allocated in one go. +There is no need to treat the areas below and above the saved +registers as separate. + +And if we allocate the frame in one go, it should be allocated +as the initial_adjust rather than the final_adjust. This allows the +frame size to grow to guard_size - guard_used_by_caller before a stack +probe is needed. (A frame with no register saves is necessarily a +leaf frame.) + +This is a no-op as thing stand, since a leaf function will have +no outgoing arguments, and so all the frame will be above where +the saved registers normally go. + +gcc/ + * config/aarch64/aarch64.cc (aarch64_layout_frame): Explicitly + allocate the frame in one go if there are no saved registers. +--- + gcc/config/aarch64/aarch64.cc | 8 +++++--- + 1 file changed, 5 insertions(+), 3 deletions(-) + +diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc +index fbd7a079a..c59af6b1c 100644 +--- a/gcc/config/aarch64/aarch64.cc ++++ b/gcc/config/aarch64/aarch64.cc +@@ -8978,9 +8978,11 @@ aarch64_layout_frame (void) + + HOST_WIDE_INT const_size, const_outgoing_args_size, const_fp_offset; + HOST_WIDE_INT const_saved_regs_size; +- if (frame.frame_size.is_constant (&const_size) +- && const_size < max_push_offset +- && known_eq (frame.hard_fp_offset, const_size)) ++ if (known_eq (frame.saved_regs_size, 0)) ++ frame.initial_adjust = frame.frame_size; ++ else if (frame.frame_size.is_constant (&const_size) ++ && const_size < max_push_offset ++ && known_eq (frame.hard_fp_offset, const_size)) + { + /* Simple, small frame with no outgoing arguments: + +-- +2.33.0 + |