rs6000: Factor out emit_split_stack_prologue

This is a first patch to make the prologue code more manageable.

	* config/rs6000/rs6000.c (emit_split_stack_prologue): New function,
	factored out from ...
	(rs6000_emit_prologue): ... here.

From-SVN: r249095

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9799675e9133ecf7d0eaa0ea0592501237f211f1..0ff3f68f5d4ae06ed0b08798400e3c64df18ab49 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-06-10  Segher Boessenkool  <segher@kernel.crashing.org>
+
+       * config/rs6000/rs6000.c (emit_split_stack_prologue): New function,
+       factored out from ...
+       (rs6000_emit_prologue): ... here.
+
 2017-06-10  Jan Hubicka  <hubicka@ucw.cz>
 
        * predict.c (drop_profile): Also drop individual bb/edge and cgraph

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 63ca2d12be814760f4a730054b1547faccd7a3c2..90d028c6aee1b644f14ee1becc067fde5bacadd8 100644 (file)
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -28106,6 +28106,51 @@ rs6000_set_handled_components (sbitmap components)
     cfun->machine->lr_is_wrapped_separately = true;
 }
 
+/* Set up the arg pointer (r12) for -fsplit-stack code.  If __morestack was
+   called, it left the arg pointer to the old stack in r29.  Otherwise, the
+   arg pointer is the top of the current frame.  */
+static void
+emit_split_stack_prologue (rs6000_stack_t *info, rtx_insn *sp_adjust,
+                          HOST_WIDE_INT frame_off, rtx frame_reg_rtx)
+{
+  cfun->machine->split_stack_argp_used = true;
+
+  if (sp_adjust)
+    {
+      rtx r12 = gen_rtx_REG (Pmode, 12);
+      rtx sp_reg_rtx = gen_rtx_REG (Pmode, STACK_POINTER_REGNUM);
+      rtx set_r12 = gen_rtx_SET (r12, sp_reg_rtx);
+      emit_insn_before (set_r12, sp_adjust);
+    }
+  else if (frame_off != 0 || REGNO (frame_reg_rtx) != 12)
+    {
+      rtx r12 = gen_rtx_REG (Pmode, 12);
+      if (frame_off == 0)
+       emit_move_insn (r12, frame_reg_rtx);
+      else
+       emit_insn (gen_add3_insn (r12, frame_reg_rtx, GEN_INT (frame_off)));
+    }
+
+  if (info->push_p)
+    {
+      rtx r12 = gen_rtx_REG (Pmode, 12);
+      rtx r29 = gen_rtx_REG (Pmode, 29);
+      rtx cr7 = gen_rtx_REG (CCUNSmode, CR7_REGNO);
+      rtx not_more = gen_label_rtx ();
+      rtx jump;
+
+      jump = gen_rtx_IF_THEN_ELSE (VOIDmode,
+                                  gen_rtx_GEU (VOIDmode, cr7, const0_rtx),
+                                  gen_rtx_LABEL_REF (VOIDmode, not_more),
+                                  pc_rtx);
+      jump = emit_jump_insn (gen_rtx_SET (pc_rtx, jump));
+      JUMP_LABEL (jump) = not_more;
+      LABEL_NUSES (not_more) += 1;
+      emit_move_insn (r12, r29);
+      emit_label (not_more);
+    }
+}
+
 /* Emit function prologue as insns.  */
 
 void
@@ -29006,46 +29051,9 @@ rs6000_emit_prologue (void)
       emit_insn (gen_frame_store (reg, sp_reg_rtx, RS6000_TOC_SAVE_SLOT));
     }
 
+  /* Set up the arg pointer (r12) for -fsplit-stack code.  */
   if (using_split_stack && split_stack_arg_pointer_used_p ())
-    {
-      /* Set up the arg pointer (r12) for -fsplit-stack code.  If
-        __morestack was called, it left the arg pointer to the old
-        stack in r29.  Otherwise, the arg pointer is the top of the
-        current frame.  */
-      cfun->machine->split_stack_argp_used = true;
-      if (sp_adjust)
-       {
-         rtx r12 = gen_rtx_REG (Pmode, 12);
-         rtx set_r12 = gen_rtx_SET (r12, sp_reg_rtx);
-         emit_insn_before (set_r12, sp_adjust);
-       }
-      else if (frame_off != 0 || REGNO (frame_reg_rtx) != 12)
-       {
-         rtx r12 = gen_rtx_REG (Pmode, 12);
-         if (frame_off == 0)
-           emit_move_insn (r12, frame_reg_rtx);
-         else
-           emit_insn (gen_add3_insn (r12, frame_reg_rtx, GEN_INT (frame_off)));
-       }
-      if (info->push_p)
-       {
-         rtx r12 = gen_rtx_REG (Pmode, 12);
-         rtx r29 = gen_rtx_REG (Pmode, 29);
-         rtx cr7 = gen_rtx_REG (CCUNSmode, CR7_REGNO);
-         rtx not_more = gen_label_rtx ();
-         rtx jump;
-
-         jump = gen_rtx_IF_THEN_ELSE (VOIDmode,
-                                      gen_rtx_GEU (VOIDmode, cr7, const0_rtx),
-                                      gen_rtx_LABEL_REF (VOIDmode, not_more),
-                                      pc_rtx);
-         jump = emit_jump_insn (gen_rtx_SET (pc_rtx, jump));
-         JUMP_LABEL (jump) = not_more;
-         LABEL_NUSES (not_more) += 1;
-         emit_move_insn (r12, r29);
-         emit_label (not_more);
-       }
-    }
+    emit_split_stack_prologue (info, sp_adjust, frame_off, frame_reg_rtx);
 }
 
 /* Output .extern statements for the save/restore routines we use.  */