From c8768dd861538817db8c1955dcce4b6d8ce17c48 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Tue, 12 Sep 2023 16:05:07 +0100
Subject: [PATCH 090/157] [Backport][SME] aarch64: Only calculate chain_offset
 if there is a chain

Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=aa8b57ee0206e8e5ac7078692ee67fb6ead05645

After previous patches, it is no longer necessary to calculate
a chain_offset in cases where there is no chain record.

gcc/
	* config/aarch64/aarch64.cc (aarch64_expand_prologue): Move the
	calculation of chain_offset into the emit_frame_chain block.
---
 gcc/config/aarch64/aarch64.cc | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index a0a4c7ac3..bef6a658b 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -10357,16 +10357,16 @@ aarch64_expand_prologue (void)
   if (callee_adjust != 0)
     aarch64_push_regs (reg1, reg2, callee_adjust);
 
-  /* The offset of the frame chain record (if any) from the current SP.  */
-  poly_int64 chain_offset = (initial_adjust + callee_adjust
-			     - frame.hard_fp_offset);
-  gcc_assert (known_ge (chain_offset, 0));
-
   /* The offset of the current SP from the bottom of the static frame.  */
   poly_int64 bytes_below_sp = frame_size - initial_adjust - callee_adjust;
 
   if (emit_frame_chain)
     {
+      /* The offset of the frame chain record (if any) from the current SP.  */
+      poly_int64 chain_offset = (initial_adjust + callee_adjust
+				 - frame.hard_fp_offset);
+      gcc_assert (known_ge (chain_offset, 0));
+
       if (callee_adjust == 0)
 	{
 	  reg1 = R29_REGNUM;
-- 
2.33.0