rs6000.md (allocate_stack): Always use an update form instruction to update the stack back chain word...

	* config/rs6000/rs6000.md (allocate_stack): Always use an update
	form instruction to update the stack back chain word, even if the
	user has disabled the generation of update instructions.
	(movdi_<mode>_update_stack): New.
	(movsi_update_stack): Likewise.
	* config/rs6000/rs6000.c (rs6000_emit_allocate_stack): Likewise,
	always use an update form instruction to update the stack back
	chain word.

From-SVN: r144047

1 files changed, 43 insertions, 26 deletions

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index b6f4181..ffbc8ad 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -10079,6 +10079,20 @@
    stdu %3,%2(%0)"
   [(set_attr "type" "store_ux,store_u")])
 
+;; This pattern is only conditional on TARGET_POWERPC64, as it is
+;; needed for stack allocation, even if the user passes -mno-update.
+(define_insn "movdi_<mode>_update_stack"
+  [(set (mem:DI (plus:P (match_operand:P 1 "gpc_reg_operand" "0,0")
+			 (match_operand:P 2 "reg_or_aligned_short_operand" "r,I")))
+	(match_operand:DI 3 "gpc_reg_operand" "r,r"))
+   (set (match_operand:P 0 "gpc_reg_operand" "=b,b")
+	(plus:P (match_dup 1) (match_dup 2)))]
+  "TARGET_POWERPC64"
+  "@
+   stdux %3,%0,%2
+   stdu %3,%2(%0)"
+  [(set_attr "type" "store_ux,store_u")])
+
 (define_insn "*movsi_update1"
   [(set (match_operand:SI 3 "gpc_reg_operand" "=r,r")
 	(mem:SI (plus:SI (match_operand:SI 1 "gpc_reg_operand" "0,0")
@@ -10121,6 +10135,20 @@
    {stu|stwu} %3,%2(%0)"
   [(set_attr "type" "store_ux,store_u")])
 
+;; This is an unconditional pattern; needed for stack allocation, even
+;; if the user passes -mno-update.
+(define_insn "movsi_update_stack"
+  [(set (mem:SI (plus:SI (match_operand:SI 1 "gpc_reg_operand" "0,0")
+			 (match_operand:SI 2 "reg_or_short_operand" "r,I")))
+	(match_operand:SI 3 "gpc_reg_operand" "r,r"))
+   (set (match_operand:SI 0 "gpc_reg_operand" "=b,b")
+	(plus:SI (match_dup 1) (match_dup 2)))]
+  ""
+  "@
+   {stux|stwux} %3,%0,%2
+   {stu|stwu} %3,%2(%0)"
+  [(set_attr "type" "store_ux,store_u")])
+
 (define_insn "*movhi_update1"
   [(set (match_operand:HI 3 "gpc_reg_operand" "=r,r")
 	(mem:HI (plus:SI (match_operand:SI 1 "gpc_reg_operand" "0,0")
@@ -10543,6 +10571,7 @@
 { rtx chain = gen_reg_rtx (Pmode);
   rtx stack_bot = gen_rtx_MEM (Pmode, stack_pointer_rtx);
   rtx neg_op0;
+  rtx insn, par, set, mem;
 
   emit_move_insn (chain, stack_bot);
 
@@ -10569,34 +10598,22 @@
   else
     neg_op0 = GEN_INT (- INTVAL (operands[1]));
 
-  if (TARGET_UPDATE)
-    {
-      rtx insn, par, set, mem;
-
-      insn = emit_insn ((* ((TARGET_32BIT) ? gen_movsi_update
-					   : gen_movdi_di_update))
+  insn = emit_insn ((* ((TARGET_32BIT) ? gen_movsi_update
+				       : gen_movdi_di_update))
 			(stack_pointer_rtx, stack_pointer_rtx, neg_op0,
 			 chain));
-      /* Since we didn't use gen_frame_mem to generate the MEM, grab
-         it now and set the alias set/attributes. The above gen_*_update
-         calls will generate a PARALLEL with the MEM set being the first
-         operation. */
-      par = PATTERN (insn);
-      gcc_assert (GET_CODE (par) == PARALLEL);
-      set = XVECEXP (par, 0, 0);
-      gcc_assert (GET_CODE (set) == SET);
-      mem = SET_DEST (set);
-      gcc_assert (MEM_P (mem));
-      MEM_NOTRAP_P (mem) = 1;
-      set_mem_alias_set (mem, get_frame_alias_set ());
-    }
-
-  else
-    {
-      emit_insn ((* ((TARGET_32BIT) ? gen_addsi3 : gen_adddi3))
-		 (stack_pointer_rtx, stack_pointer_rtx, neg_op0));
-      emit_move_insn (gen_frame_mem (Pmode, stack_pointer_rtx), chain);
-    }
+  /* Since we didn't use gen_frame_mem to generate the MEM, grab
+     it now and set the alias set/attributes. The above gen_*_update
+     calls will generate a PARALLEL with the MEM set being the first
+     operation. */
+  par = PATTERN (insn);
+  gcc_assert (GET_CODE (par) == PARALLEL);
+  set = XVECEXP (par, 0, 0);
+  gcc_assert (GET_CODE (set) == SET);
+  mem = SET_DEST (set);
+  gcc_assert (MEM_P (mem));
+  MEM_NOTRAP_P (mem) = 1;
+  set_mem_alias_set (mem, get_frame_alias_set ());
 
   emit_move_insn (operands[0], virtual_stack_dynamic_rtx);
   DONE;