From: Richard Sandiford <richard.sandiford@arm.com>
Date: Tue, 12 Sep 2023 15:05:07 +0000 (+0100)
Subject: aarch64: Only calculate chain_offset if there is a chain
X-Git-Tag: basepoints/gcc-15~6251
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa8b57ee0206e8e5ac7078692ee67fb6ead05645;p=thirdparty%2Fgcc.git

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.cc (aarch64_expand_prologue): Move the
	calculation of chain_offset into the emit_frame_chain block.
---

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 2c218c909061..25b5fb243a6f 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -10111,16 +10111,16 @@ 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;