* config/mn10300/mn10300.c (expand_epilogue): If SP is to be

adjusted by less than 256 bytes, use ret regardless of having any
callee-saved register to restore.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33573 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bee0427..77fdec3 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2000-05-01  Alexandre Oliva  <aoliva@cygnus.com>
+
+       * config/mn10300/mn10300.c (expand_epilogue): If SP is to be
+       adjusted by less than 256 bytes, use ret regardless of having any
+       callee-saved register to restore.
+
 2000-05-01 Laurynas Biveinis <lauras@softhome.net>
 
        * tm.texi (TARGET_HAS_F_SETFLKW): Fix typo.

diff --git a/gcc/config/mn10300/mn10300.c b/gcc/config/mn10300/mn10300.c
index 70577ff..e643505 100644 (file)
--- a/gcc/config/mn10300/mn10300.c
+++ b/gcc/config/mn10300/mn10300.c
@@ -452,11 +452,7 @@ expand_epilogue ()
       emit_move_insn (stack_pointer_rtx, frame_pointer_rtx);
       size = 0;
     }
-  else if ((regs_ever_live[2] || regs_ever_live[3]
-           || regs_ever_live[14] || regs_ever_live[15]
-           || regs_ever_live[16] || regs_ever_live[17]
-           || regs_ever_live[6] || regs_ever_live[7])
-          && size + REG_SAVE_BYTES > 255)
+  else if (size + REG_SAVE_BYTES > 255)
     {
       emit_insn (gen_addsi3 (stack_pointer_rtx,
                             stack_pointer_rtx,
@@ -464,31 +460,16 @@ expand_epilogue ()
       size = 0;
     }
 
-  /* For simplicity, we just movm all the callee saved registers to
-     the stack with one instruction.
-
-     ?!? Only save registers which are actually used.  Reduces
-     stack requirements and is faster.  */
-  if (regs_ever_live[2] || regs_ever_live[3]
+  /* Adjust the stack and restore callee-saved registers, if any.  */
+  if (size || regs_ever_live[2] || regs_ever_live[3]
       || regs_ever_live[6] || regs_ever_live[7]
       || regs_ever_live[14] || regs_ever_live[15]
       || regs_ever_live[16] || regs_ever_live[17]
       || frame_pointer_needed)
-    emit_jump_insn (gen_return_internal_regs (GEN_INT (size + REG_SAVE_BYTES)));
+    emit_jump_insn (gen_return_internal_regs
+                   (GEN_INT (size + REG_SAVE_BYTES)));
   else
-    {
-      if (size)
-       {
-         emit_insn (gen_addsi3 (stack_pointer_rtx,
-                                stack_pointer_rtx,
-                                GEN_INT (size)));
-         emit_jump_insn (gen_return_internal ());
-       }
-      else
-       {
-         emit_jump_insn (gen_return ());
-       }
-    }
+    emit_jump_insn (gen_return_internal ());
 }
 
 /* Update the condition code from the insn.  */