pa.c (compute_frame_size): Use STARTINg_FRAME_OFFSET instead of depending on a magic constant value.

        * pa.c (compute_frame_size): Use STARTINg_FRAME_OFFSET instead
        of depending on a magic constant value.  Update comments.
        (hppa_expand_prologue): Similarly.

From-SVN: r28356

2 files changed, 29 insertions, 4 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b3c5395..4e51826 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 Sat Jul 31 04:10:01 1999  Jeffrey A Law  (law@cygnus.com)
 
+	* pa.c (compute_frame_size): Use STARTINg_FRAME_OFFSET instead
+	of depending on a magic constant value.  Update comments.
+	(hppa_expand_prologue): Similarly.
+
 	* pa.md (reload_indi, reload_outdi): Allow any register for the
 	original reload register.
 
diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index be9f65e..209976d 100644
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -2593,10 +2593,14 @@ compute_frame_size (size, fregs_live)
   extern int current_function_outgoing_args_size;
   int i, fsize;
 
-  /* 8 is space for frame pointer + filler. If any frame is allocated
-     we need to add this in because of STARTING_FRAME_OFFSET. */
-  fsize = size + (size || frame_pointer_needed ? 8 : 0);
+  /* Space for frame pointer + filler. If any frame is allocated
+     we need to add this in because of STARTING_FRAME_OFFSET.
 
+     Similar code also appears in hppa_expand_prologue.  Change both
+     of them at the same time.  */
+  fsize = size + (size || frame_pointer_needed ? STARTING_FRAME_OFFSET : 0);
+
+  /* Account for space used by the callee general register saves.  */
   for (i = 18; i >= 3; i--)
     if (regs_ever_live[i])
       fsize += UNITS_PER_WORD;
@@ -2604,16 +2608,25 @@ compute_frame_size (size, fregs_live)
   /* Round the stack.  */
   fsize = (fsize + 7) & ~7;
 
+  /* Account for space used by the callee floating point register saves.  */
   for (i = 66; i >= 48; i -= 2)
     if (regs_ever_live[i] || regs_ever_live[i + 1])
       {
 	if (fregs_live)
 	  *fregs_live = 1;
 
+	/* We always save both halves of the FP register, so always
+	   increment the frame size by 8 bytes.  */
 	fsize += 8;
       }
 
+  /* The various ABIs include space for the outgoing parameters in the
+     size of the current function's stack frame.  */
   fsize += current_function_outgoing_args_size;
+
+  /* Allocate space for the fixed frame marker.  This space must be
+     allocated for any function that makes calls or otherwise allocates
+     stack space.  */
   if (! leaf_function_p () || fsize)
     fsize += 32;
   return (fsize + STACK_BOUNDARY - 1) & ~(STACK_BOUNDARY - 1);
@@ -2703,7 +2716,15 @@ hppa_expand_prologue()
   gr_saved = 0;
   fr_saved = 0;
   save_fregs = 0;
-  local_fsize =  size + (size || frame_pointer_needed ? 8 : 0);
+
+  /* Allocate space for frame pointer + filler. If any frame is allocated
+     we need to add this in because of STARTING_FRAME_OFFSET.
+
+     Similar code also appears in compute_frame_size.  Change both
+     of them at the same time.  */
+  local_fsize = size + (size || frame_pointer_needed
+			? STARTING_FRAME_OFFSET : 0);
+
   actual_fsize = compute_frame_size (size, &save_fregs);
 
   /* Compute a few things we will use often.  */