From 03d5e89e7f3be53fd7142556e8e0a2774c653dca Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Tue, 12 Sep 2023 16:08:49 +0100
Subject: [PATCH] aarch64: Explicitly handle frames with no saved registers

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 79253322fd7c..e1f21230c15e 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -8378,9 +8378,11 @@ 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:
 
-- 
2.43.5