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From f9e1c86b3397faa8dee4bbaeaf8b56492e3a63df Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Fri, 16 Jun 2023 17:00:51 +0100
Subject: [PATCH 26/32] 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.
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.c (aarch64_layout_frame): Explicitly
allocate the frame in one go if there are no saved registers.
---
gcc/config/aarch64/aarch64.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 4ad73220337f..ed9e2a28f914 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -4215,9 +4215,11 @@ aarch64_layout_frame (void)
max_push_offset = 256;
HOST_WIDE_INT const_size, const_fp_offset;
- if (cfun->machine->frame.frame_size.is_constant (&const_size)
- && const_size < max_push_offset
- && known_eq (crtl->outgoing_args_size, 0))
+ if (cfun->machine->frame.saved_regs_size == 0)
+ cfun->machine->frame.initial_adjust = cfun->machine->frame.frame_size;
+ else if (cfun->machine->frame.frame_size.is_constant (&const_size)
+ && const_size < max_push_offset
+ && known_eq (crtl->outgoing_args_size, 0))
{
/* Simple, small frame with no outgoing arguments:
stp reg1, reg2, [sp, -frame_size]!
--
2.42.0
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