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 --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 96e99f6c17aeac468890b599936b32a54e67cb94..cf5244b7ec08d90864e3188424e12118478a8f37 100644 (file)
--- 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;