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* [gcc(refs/vendors/ARM/heads/CVE-2023-4039/gcc-8)] aarch64: Explicitly handle frames with no saved registers
@ 2023-09-12 15:23 Richard Sandiford
0 siblings, 0 replies; only message in thread
From: Richard Sandiford @ 2023-09-12 15:23 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:f9e1c86b3397faa8dee4bbaeaf8b56492e3a63df
commit f9e1c86b3397faa8dee4bbaeaf8b56492e3a63df
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Fri Jun 16 17:00:51 2023 +0100
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.
Diff:
---
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]!
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