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