[gcc r11-10992] aarch64: Only calculate chain_offset if there is a chain

[gcc r11-10992] aarch64: Only calculate chain_offset if there is a chain

[Richard Sandiford]

https://gcc.gnu.org/g:7356df0319aefe4c68ef57ec4c6bd18c72188a34

commit r11-10992-g7356df0319aefe4c68ef57ec4c6bd18c72188a34
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Tue Sep 12 16:19:46 2023 +0100

    aarch64: Only calculate chain_offset if there is a chain
    
    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.c (aarch64_expand_prologue): Move the
            calculation of chain_offset into the emit_frame_chain block.

Diff:
---
 gcc/config/aarch64/aarch64.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 96e99f6c17ae..cf5244b7ec08 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -8974,16 +8974,16 @@ 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;