From 8254e1b9cd500e0c278465a3657543477e9d1250 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <[email protected]>
Date: Tue, 12 Sep 2023 16:08:56 +0100
Subject: [PATCH] aarch64: Remove below_hard_fp_saved_regs_size

After previous patches, it's no longer necessary to store
saved_regs_size and below_hard_fp_saved_regs_size in the frame info.
All measurements instead use the top or bottom of the frame as
reference points.

gcc/
	* config/aarch64/aarch64.h (aarch64_frame::saved_regs_size)
	(aarch64_frame::below_hard_fp_saved_regs_size): Delete.
	* config/aarch64/aarch64.cc (aarch64_layout_frame): Update accordingly.
---
 gcc/config/aarch64/aarch64.cc | 45 ++++++++++++++++-------------------
 gcc/config/aarch64/aarch64.h  |  7 ------
 2 files changed, 21 insertions(+), 31 deletions(-)

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index a8d907df8843..ac3d3b336a37 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -8269,9 +8269,8 @@ aarch64_layout_frame (void)
 
   /* OFFSET is now the offset of the hard frame pointer from the bottom
      of the callee save area.  */
-  frame.below_hard_fp_saved_regs_size = offset - frame.bytes_below_saved_regs;
-  bool saves_below_hard_fp_p
-    = maybe_ne (frame.below_hard_fp_saved_regs_size, 0);
+  auto below_hard_fp_saved_regs_size = offset - frame.bytes_below_saved_regs;
+  bool saves_below_hard_fp_p = maybe_ne (below_hard_fp_saved_regs_size, 0);
   gcc_assert (!saves_below_hard_fp_p
 	      || (frame.sve_save_and_probe != INVALID_REGNUM
 		  && known_eq (frame.reg_offset[frame.sve_save_and_probe],
@@ -8341,9 +8340,8 @@ aarch64_layout_frame (void)
 
   offset = aligned_upper_bound (offset, STACK_BOUNDARY / BITS_PER_UNIT);
 
-  frame.saved_regs_size = offset - frame.bytes_below_saved_regs;
-  gcc_assert (known_eq (frame.saved_regs_size,
-			frame.below_hard_fp_saved_regs_size)
+  auto saved_regs_size = offset - frame.bytes_below_saved_regs;
+  gcc_assert (known_eq (saved_regs_size, below_hard_fp_saved_regs_size)
 	      || (frame.hard_fp_save_and_probe != INVALID_REGNUM
 		  && known_eq (frame.reg_offset[frame.hard_fp_save_and_probe],
 			       frame.bytes_below_hard_fp)));
@@ -8352,7 +8350,7 @@ aarch64_layout_frame (void)
      The saving of the bottommost register counts as an implicit probe,
      which allows us to maintain the invariant described in the comment
      at expand_prologue.  */
-  gcc_assert (crtl->is_leaf || maybe_ne (frame.saved_regs_size, 0));
+  gcc_assert (crtl->is_leaf || maybe_ne (saved_regs_size, 0));
 
   offset += get_frame_size ();
   offset = aligned_upper_bound (offset, STACK_BOUNDARY / BITS_PER_UNIT);
@@ -8409,7 +8407,7 @@ aarch64_layout_frame (void)
 
   HOST_WIDE_INT const_size, const_below_saved_regs, const_above_fp;
   HOST_WIDE_INT const_saved_regs_size;
-  if (known_eq (frame.saved_regs_size, 0))
+  if (known_eq (saved_regs_size, 0))
     frame.initial_adjust = frame.frame_size;
   else if (frame.frame_size.is_constant (&const_size)
 	   && const_size < max_push_offset
@@ -8422,7 +8420,7 @@ aarch64_layout_frame (void)
       frame.callee_adjust = const_size;
     }
   else if (frame.bytes_below_saved_regs.is_constant (&const_below_saved_regs)
-	   && frame.saved_regs_size.is_constant (&const_saved_regs_size)
+	   && saved_regs_size.is_constant (&const_saved_regs_size)
 	   && const_below_saved_regs + const_saved_regs_size < 512
 	   /* We could handle this case even with data below the saved
 	      registers, provided that that data left us with valid offsets
@@ -8441,8 +8439,7 @@ aarch64_layout_frame (void)
       frame.initial_adjust = frame.frame_size;
     }
   else if (saves_below_hard_fp_p
-	   && known_eq (frame.saved_regs_size,
-			frame.below_hard_fp_saved_regs_size))
+	   && known_eq (saved_regs_size, below_hard_fp_saved_regs_size))
     {
       /* Frame in which all saves are SVE saves:
 
@@ -8464,7 +8461,7 @@ aarch64_layout_frame (void)
 	 [save SVE registers relative to SP]
 	 sub sp, sp, bytes_below_saved_regs  */
       frame.callee_adjust = const_above_fp;
-      frame.sve_callee_adjust = frame.below_hard_fp_saved_regs_size;
+      frame.sve_callee_adjust = below_hard_fp_saved_regs_size;
       frame.final_adjust = frame.bytes_below_saved_regs;
     }
   else
@@ -8479,7 +8476,7 @@ aarch64_layout_frame (void)
 	 [save SVE registers relative to SP]
 	 sub sp, sp, bytes_below_saved_regs  */
       frame.initial_adjust = frame.bytes_above_hard_fp;
-      frame.sve_callee_adjust = frame.below_hard_fp_saved_regs_size;
+      frame.sve_callee_adjust = below_hard_fp_saved_regs_size;
       frame.final_adjust = frame.bytes_below_saved_regs;
     }
 
@@ -9621,17 +9618,17 @@ aarch64_epilogue_uses (int regno)
 	|  local variables              | <-- frame_pointer_rtx
 	|                               |
 	+-------------------------------+
-	|  padding                      | \
-	+-------------------------------+  |
-	|  callee-saved registers       |  | frame.saved_regs_size
-	+-------------------------------+  |
-	|  LR'                          |  |
-	+-------------------------------+  |
-	|  FP'                          |  |
-	+-------------------------------+  |<- hard_frame_pointer_rtx (aligned)
-	|  SVE vector registers         |  | \
-	+-------------------------------+  |  | below_hard_fp_saved_regs_size
-	|  SVE predicate registers      | /  /
+	|  padding                      |
+	+-------------------------------+
+	|  callee-saved registers       |
+	+-------------------------------+
+	|  LR'                          |
+	+-------------------------------+
+	|  FP'                          |
+	+-------------------------------+ <-- hard_frame_pointer_rtx (aligned)
+	|  SVE vector registers         |
+	+-------------------------------+
+	|  SVE predicate registers      |
 	+-------------------------------+
 	|  dynamic allocation           |
 	+-------------------------------+
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 46d4693e2064..01f7751bc783 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -871,18 +871,11 @@ struct GTY (()) aarch64_frame
      STACK_BOUNDARY.  */
   HOST_WIDE_INT saved_varargs_size;
 
-  /* The size of the callee-save registers with a slot in REG_OFFSET.  */
-  poly_int64 saved_regs_size;
-
   /* The number of bytes between the bottom of the static frame (the bottom
      of the outgoing arguments) and the bottom of the register save area.
      This value is always a multiple of STACK_BOUNDARY.  */
   poly_int64 bytes_below_saved_regs;
 
-  /* The size of the callee-save registers with a slot in REG_OFFSET that
-     are saved below the hard frame pointer.  */
-  poly_int64 below_hard_fp_saved_regs_size;
-
   /* The number of bytes between the bottom of the static frame (the bottom
      of the outgoing arguments) and the hard frame pointer.  This value is
      always a multiple of STACK_BOUNDARY.  */
-- 
2.43.5