PR middle-end/15825

	* ifcvt.c (unshare_ifcvt_sequence): Rename to end_ifcvt_sequence.
	Use get_isns and end_sequence instead of accepting a seq argument.
	Scan the instruction sequence for unrecognizable or jump insns.
	(noce_try_move, noce_try_store_flag, noce_try_store_flag_constants,
	noce_try_addcc, noce_try_store_flag_mask, noce_try_cmove,
	noce_try_cmove_arith, noce_try_minmax, noce_try_abs,
	noce_try_sign_mask): Use end_ifcvt_sequence to factor common code.

	* gcc.dg/pr15825-1.c: New test case.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@83671 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 64 insertions, 66 deletions

diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c
index 79774adc90a..9de5961a29e 100644
--- a/gcc/ifcvt.c
+++ b/gcc/ifcvt.c
@@ -699,14 +699,32 @@ noce_emit_move_insn (rtx x, rtx y)
 		   GET_MODE_BITSIZE (inmode));
 }
 
-/* Unshare sequence SEQ produced by if conversion.  We care to mark
-   all arguments that may be shared with outer instruction stream.  */
-static void
-unshare_ifcvt_sequence (struct noce_if_info *if_info, rtx seq)
+/* Return sequence of instructions generated by if conversion.  This
+   function calls end_sequence() to end the current stream, ensures
+   that are instructions are unshared, recognizable non-jump insns.
+   On failure, this function returns a NULL_RTX.  */
+
+static rtx
+end_ifcvt_sequence (struct noce_if_info *if_info)
 {
+  rtx y;
+  rtx seq = get_insns ();
+
   set_used_flags (if_info->x);
   set_used_flags (if_info->cond);
   unshare_all_rtl_in_chain (seq);
+  end_sequence ();
+
+  if (seq_contains_jump (seq))
+    return NULL_RTX;
+
+  /* Make sure that all of the instructions emitted are recognizable.
+     As an excersise for the reader, build a general mechanism that
+     allows proper placement of required clobbers.  */
+  for (y = seq; y ; y = NEXT_INSN (y))
+    if (recog_memoized (y) == -1)
+      return NULL_RTX;
+  return seq;
 }
 
 /* Convert "if (a != b) x = a; else x = b" into "x = a" and
@@ -742,17 +760,9 @@ noce_try_move (struct noce_if_info *if_info)
 	{
 	  start_sequence ();
 	  noce_emit_move_insn (if_info->x, y);
-	  seq = get_insns ();
-	  unshare_ifcvt_sequence (if_info, seq);
-	  end_sequence ();
-
-	  /* Make sure that all of the instructions emitted are
-	     recognizable.  As an excersise for the reader, build
-	     a general mechanism that allows proper placement of
-	     required clobbers.  */
-	  for (y = seq; y ; y = NEXT_INSN (y))
-	    if (recog_memoized (y) == -1)
-	      return FALSE;
+	  seq = end_ifcvt_sequence (if_info);
+	  if (!seq)
+	    return FALSE;
 
 	  emit_insn_before_setloc (seq, if_info->jump,
 				   INSN_LOCATOR (if_info->insn_a));
@@ -795,11 +805,12 @@ noce_try_store_flag (struct noce_if_info *if_info)
       if (target != if_info->x)
 	noce_emit_move_insn (if_info->x, target);
 
-      seq = get_insns ();
-      unshare_ifcvt_sequence (if_info, seq);
-      end_sequence ();
-      emit_insn_before_setloc (seq, if_info->jump, INSN_LOCATOR (if_info->insn_a));
+      seq = end_ifcvt_sequence (if_info);
+      if (! seq)
+	return FALSE;
 
+      emit_insn_before_setloc (seq, if_info->jump,
+			       INSN_LOCATOR (if_info->insn_a));
       return TRUE;
     }
   else
@@ -926,15 +937,12 @@ noce_try_store_flag_constants (struct noce_if_info *if_info)
       if (target != if_info->x)
 	noce_emit_move_insn (if_info->x, target);
 
-      seq = get_insns ();
-      unshare_ifcvt_sequence (if_info, seq);
-      end_sequence ();
-
-      if (seq_contains_jump (seq))
+      seq = end_ifcvt_sequence (if_info);
+      if (!seq)
 	return FALSE;
 
-      emit_insn_before_setloc (seq, if_info->jump, INSN_LOCATOR (if_info->insn_a));
-
+      emit_insn_before_setloc (seq, if_info->jump,
+			       INSN_LOCATOR (if_info->insn_a));
       return TRUE;
     }
 
@@ -978,11 +986,12 @@ noce_try_addcc (struct noce_if_info *if_info)
 	      if (target != if_info->x)
 		noce_emit_move_insn (if_info->x, target);
 
-	      seq = get_insns ();
-	      unshare_ifcvt_sequence (if_info, seq);
-	      end_sequence ();
+	      seq = end_ifcvt_sequence (if_info);
+	      if (!seq)
+		return FALSE;
+
 	      emit_insn_before_setloc (seq, if_info->jump,
-				      INSN_LOCATOR (if_info->insn_a));
+				       INSN_LOCATOR (if_info->insn_a));
 	      return TRUE;
 	    }
 	  end_sequence ();
@@ -1017,16 +1026,12 @@ noce_try_addcc (struct noce_if_info *if_info)
 	      if (target != if_info->x)
 		noce_emit_move_insn (if_info->x, target);
 
-	      seq = get_insns ();
-	      unshare_ifcvt_sequence (if_info, seq);
-	      end_sequence ();
-
-	      if (seq_contains_jump (seq))
+	      seq = end_ifcvt_sequence (if_info);
+	      if (!seq)
 		return FALSE;
 
 	      emit_insn_before_setloc (seq, if_info->jump,
-				      INSN_LOCATOR (if_info->insn_a));
-
+				       INSN_LOCATOR (if_info->insn_a));
 	      return TRUE;
 	    }
 	  end_sequence ();
@@ -1071,16 +1076,12 @@ noce_try_store_flag_mask (struct noce_if_info *if_info)
 	  if (target != if_info->x)
 	    noce_emit_move_insn (if_info->x, target);
 
-	  seq = get_insns ();
-	  unshare_ifcvt_sequence (if_info, seq);
-	  end_sequence ();
-
-	  if (seq_contains_jump (seq))
+	  seq = end_ifcvt_sequence (if_info);
+	  if (!seq)
 	    return FALSE;
 
 	  emit_insn_before_setloc (seq, if_info->jump,
-				  INSN_LOCATOR (if_info->insn_a));
-
+				   INSN_LOCATOR (if_info->insn_a));
 	  return TRUE;
 	}
 
@@ -1169,11 +1170,12 @@ noce_try_cmove (struct noce_if_info *if_info)
 	  if (target != if_info->x)
 	    noce_emit_move_insn (if_info->x, target);
 
-	  seq = get_insns ();
-	  unshare_ifcvt_sequence (if_info, seq);
-	  end_sequence ();
+	  seq = end_ifcvt_sequence (if_info);
+	  if (!seq)
+	    return FALSE;
+
 	  emit_insn_before_setloc (seq, if_info->jump,
-				  INSN_LOCATOR (if_info->insn_a));
+				   INSN_LOCATOR (if_info->insn_a));
 	  return TRUE;
 	}
       else
@@ -1334,9 +1336,10 @@ noce_try_cmove_arith (struct noce_if_info *if_info)
   else if (target != x)
     noce_emit_move_insn (x, target);
 
-  tmp = get_insns ();
-  unshare_ifcvt_sequence (if_info, tmp);
-  end_sequence ();
+  tmp = end_ifcvt_sequence (if_info);
+  if (!tmp)
+    return FALSE;
+
   emit_insn_before_setloc (tmp, if_info->jump, INSN_LOCATOR (if_info->insn_a));
   return TRUE;
 
@@ -1580,11 +1583,8 @@ noce_try_minmax (struct noce_if_info *if_info)
   if (target != if_info->x)
     noce_emit_move_insn (if_info->x, target);
 
-  seq = get_insns ();
-  unshare_ifcvt_sequence (if_info, seq);
-  end_sequence ();
-
-  if (seq_contains_jump (seq))
+  seq = end_ifcvt_sequence (if_info);
+  if (!seq)
     return FALSE;
 
   emit_insn_before_setloc (seq, if_info->jump, INSN_LOCATOR (if_info->insn_a));
@@ -1698,11 +1698,8 @@ noce_try_abs (struct noce_if_info *if_info)
   if (target != if_info->x)
     noce_emit_move_insn (if_info->x, target);
 
-  seq = get_insns ();
-  unshare_ifcvt_sequence (if_info, seq);
-  end_sequence ();
-
-  if (seq_contains_jump (seq))
+  seq = end_ifcvt_sequence (if_info);
+  if (!seq)
     return FALSE;
 
   emit_insn_before_setloc (seq, if_info->jump, INSN_LOCATOR (if_info->insn_a));
@@ -1768,11 +1765,12 @@ noce_try_sign_mask (struct noce_if_info *if_info)
     }
 
   noce_emit_move_insn (if_info->x, t);
-  seq = get_insns ();
-  unshare_ifcvt_sequence (if_info, seq);
-  end_sequence ();
-  emit_insn_before_setloc (seq, if_info->jump,
-			   INSN_LOCATOR (if_info->insn_a));
+
+  seq = end_ifcvt_sequence (if_info);
+  if (!seq)
+    return FALSE;
+
+  emit_insn_before_setloc (seq, if_info->jump, INSN_LOCATOR (if_info->insn_a));
   return TRUE;
 }