[committed] Use target-insns.def for save/restore stack

[committed] Use target-insns.def for save/restore stack

[Richard Sandiford]

Bootstrapped & regression-tested on x86_64-linux-gnu and aarch64-linux-gnu.
Also tested via config-list.mk.  Committed as preapproved.

Thanks,
Richard


gcc/
	* target-insns.def (restore_stack_block, restore_stack_function)
	(restore_stack_nonlocal, save_stack_block, save_stack_function)
	(save_stack_nonlocal): New targetm instruction patterns.
	* builtins.c (expand_builtin_apply): Use them instead of
	HAVE_*/gen_* interface.
	* explow.c (emit_stack_save, emit_stack_restore): Likewise.

Index: gcc/target-insns.def
===================================================================
--- gcc/target-insns.def	2015-07-05 08:51:23.963477604 +0100
+++ gcc/target-insns.def	2015-07-05 08:51:23.955477687 +0100
@@ -46,7 +46,13 @@ DEF_TARGET_INSN (nonlocal_goto, (rtx x0,
 DEF_TARGET_INSN (nonlocal_goto_receiver, (void))
 DEF_TARGET_INSN (prefetch, (rtx x0, rtx x1, rtx x2))
 DEF_TARGET_INSN (prologue, (void))
+DEF_TARGET_INSN (restore_stack_block, (rtx x0, rtx x1))
+DEF_TARGET_INSN (restore_stack_function, (rtx x0, rtx x1))
+DEF_TARGET_INSN (restore_stack_nonlocal, (rtx x0, rtx x1))
 DEF_TARGET_INSN (return, (void))
+DEF_TARGET_INSN (save_stack_block, (rtx x0, rtx x1))
+DEF_TARGET_INSN (save_stack_function, (rtx x0, rtx x1))
+DEF_TARGET_INSN (save_stack_nonlocal, (rtx x0, rtx x1))
 DEF_TARGET_INSN (sibcall_epilogue, (void))
 DEF_TARGET_INSN (simple_return, (void))
 DEF_TARGET_INSN (store_multiple, (rtx x0, rtx x1, rtx x2))
Index: gcc/builtins.c
===================================================================
--- gcc/builtins.c	2015-07-05 08:51:23.963477604 +0100
+++ gcc/builtins.c	2015-07-05 08:51:23.955477687 +0100
@@ -1611,11 +1611,9 @@ expand_builtin_apply (rtx function, rtx
   NO_DEFER_POP;
 
   /* Save the stack with nonlocal if available.  */
-#ifdef HAVE_save_stack_nonlocal
-  if (HAVE_save_stack_nonlocal)
+  if (targetm.have_save_stack_nonlocal ())
     emit_stack_save (SAVE_NONLOCAL, &old_stack_level);
   else
-#endif
     emit_stack_save (SAVE_BLOCK, &old_stack_level);
 
   /* Allocate a block of memory onto the stack and copy the memory
@@ -1732,11 +1730,9 @@ expand_builtin_apply (rtx function, rtx
   add_function_usage_to (call_insn, call_fusage);
 
   /* Restore the stack.  */
-#ifdef HAVE_save_stack_nonlocal
-  if (HAVE_save_stack_nonlocal)
+  if (targetm.have_save_stack_nonlocal ())
     emit_stack_restore (SAVE_NONLOCAL, old_stack_level);
   else
-#endif
     emit_stack_restore (SAVE_BLOCK, old_stack_level);
   fixup_args_size_notes (call_insn, get_last_insn (), 0);
 
Index: gcc/explow.c
===================================================================
--- gcc/explow.c	2015-07-05 08:51:23.963477604 +0100
+++ gcc/explow.c	2015-07-05 08:51:23.955477687 +0100
@@ -973,30 +973,24 @@ emit_stack_save (enum save_level save_le
 {
   rtx sa = *psave;
   /* The default is that we use a move insn and save in a Pmode object.  */
-  rtx (*fcn) (rtx, rtx) = gen_move_insn_uncast;
+  rtx_insn *(*fcn) (rtx, rtx) = gen_move_insn;
   machine_mode mode = STACK_SAVEAREA_MODE (save_level);
 
   /* See if this machine has anything special to do for this kind of save.  */
   switch (save_level)
     {
-#ifdef HAVE_save_stack_block
     case SAVE_BLOCK:
-      if (HAVE_save_stack_block)
-	fcn = gen_save_stack_block;
+      if (targetm.have_save_stack_block ())
+	fcn = targetm.gen_save_stack_block;
       break;
-#endif
-#ifdef HAVE_save_stack_function
     case SAVE_FUNCTION:
-      if (HAVE_save_stack_function)
-	fcn = gen_save_stack_function;
+      if (targetm.have_save_stack_function ())
+	fcn = targetm.gen_save_stack_function;
       break;
-#endif
-#ifdef HAVE_save_stack_nonlocal
     case SAVE_NONLOCAL:
-      if (HAVE_save_stack_nonlocal)
-	fcn = gen_save_stack_nonlocal;
+      if (targetm.have_save_stack_nonlocal ())
+	fcn = targetm.gen_save_stack_nonlocal;
       break;
-#endif
     default:
       break;
     }
@@ -1028,7 +1022,7 @@ emit_stack_save (enum save_level save_le
 emit_stack_restore (enum save_level save_level, rtx sa)
 {
   /* The default is that we use a move insn.  */
-  rtx (*fcn) (rtx, rtx) = gen_move_insn_uncast;
+  rtx_insn *(*fcn) (rtx, rtx) = gen_move_insn;
 
   /* If stack_realign_drap, the x86 backend emits a prologue that aligns both
      STACK_POINTER and HARD_FRAME_POINTER.
@@ -1047,24 +1041,18 @@ emit_stack_restore (enum save_level save
   /* See if this machine has anything special to do for this kind of save.  */
   switch (save_level)
     {
-#ifdef HAVE_restore_stack_block
     case SAVE_BLOCK:
-      if (HAVE_restore_stack_block)
-	fcn = gen_restore_stack_block;
+      if (targetm.have_restore_stack_block ())
+	fcn = targetm.gen_restore_stack_block;
       break;
-#endif
-#ifdef HAVE_restore_stack_function
     case SAVE_FUNCTION:
-      if (HAVE_restore_stack_function)
-	fcn = gen_restore_stack_function;
+      if (targetm.have_restore_stack_function ())
+	fcn = targetm.gen_restore_stack_function;
       break;
-#endif
-#ifdef HAVE_restore_stack_nonlocal
     case SAVE_NONLOCAL:
-      if (HAVE_restore_stack_nonlocal)
-	fcn = gen_restore_stack_nonlocal;
+      if (targetm.have_restore_stack_nonlocal ())
+	fcn = targetm.gen_restore_stack_nonlocal;
       break;
-#endif
     default:
       break;
     }