[PATCH 09/50] cfgcleanup.c:mentions_nonequal_regs

[Richard Sandiford <rdsandiford at googlemail dot com>]

gcc/
	* cfgcleanup.c: Include rtl-iter.h.
	(mentions_nonequal_regs): Turn from being a for_each_rtx callback
	to being a function that examines each subrtx itself.
	(thread_jump): Update accordingly.

Index: gcc/cfgcleanup.c
===================================================================
--- gcc/cfgcleanup.c	2014-08-03 11:25:10.407959076 +0100
+++ gcc/cfgcleanup.c	2014-08-03 11:25:22.602079634 +0100
@@ -53,6 +53,7 @@ Software Foundation; either version 3, o
 #include "df.h"
 #include "dce.h"
 #include "dbgcnt.h"
+#include "rtl-iter.h"
 
 #define FORWARDER_BLOCK_P(BB) ((BB)->flags & BB_FORWARDER_BLOCK)
 
@@ -80,7 +81,6 @@ static edge thread_jump (edge, basic_blo
 static bool mark_effect (rtx, bitmap);
 static void notice_new_block (basic_block);
 static void update_forwarder_flag (basic_block);
-static int mentions_nonequal_regs (rtx *, void *);
 static void merge_memattrs (rtx, rtx);
 
 /* Set flags for newly created block.  */
@@ -234,29 +234,31 @@ mark_effect (rtx exp, regset nonequal)
     }
 }
 
-/* Return nonzero if X is a register set in regset DATA.
-   Called via for_each_rtx.  */
-static int
-mentions_nonequal_regs (rtx *x, void *data)
+/* Return true if X contains a register in NONEQUAL.  */
+static bool
+mentions_nonequal_regs (const_rtx x, regset nonequal)
 {
-  regset nonequal = (regset) data;
-  if (REG_P (*x))
+  subrtx_iterator::array_type array;
+  FOR_EACH_SUBRTX (iter, array, x, NONCONST)
     {
-      int regno;
-
-      regno = REGNO (*x);
-      if (REGNO_REG_SET_P (nonequal, regno))
-	return 1;
-      if (regno < FIRST_PSEUDO_REGISTER)
+      const_rtx x = *iter;
+      if (REG_P (x))
 	{
-	  int n = hard_regno_nregs[regno][GET_MODE (*x)];
-	  while (--n > 0)
-	    if (REGNO_REG_SET_P (nonequal, regno + n))
-	      return 1;
+	  unsigned int regno = REGNO (x);
+	  if (REGNO_REG_SET_P (nonequal, regno))
+	    return true;
+	  if (regno < FIRST_PSEUDO_REGISTER)
+	    {
+	      int n = hard_regno_nregs[regno][GET_MODE (x)];
+	      while (--n > 0)
+		if (REGNO_REG_SET_P (nonequal, regno + n))
+		  return true;
+	    }
 	}
     }
-  return 0;
+  return false;
 }
+
 /* Attempt to prove that the basic block B will have no side effects and
    always continues in the same edge if reached via E.  Return the edge
    if exist, NULL otherwise.  */
@@ -379,7 +381,7 @@ thread_jump (edge e, basic_block b)
 
   /* cond2 must not mention any register that is not equal to the
      former block.  */
-  if (for_each_rtx (&cond2, mentions_nonequal_regs, nonequal))
+  if (mentions_nonequal_regs (cond2, nonequal))
     goto failed_exit;
 
   EXECUTE_IF_SET_IN_REG_SET (nonequal, 0, i, rsi)