* ifcvt.c (seq_contains_jump): New.

        (noce_try_store_flag_constants): Use it to fail conversion.
        (noce_try_store_flag_inc, noce_try_store_flag_mask): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34179 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 37 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 80e638c5918..68a7369efdb 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2000-05-25  Richard Henderson  <rth@cygnus.com>
+
+	* ifcvt.c (seq_contains_jump): New.
+	(noce_try_store_flag_constants): Use it to fail conversion.
+	(noce_try_store_flag_inc, noce_try_store_flag_mask): Likewise.
+
 2000-05-25  Mark Mitchell  <mark@codesourcery.com>
 
 	* except.h (can_throw): Declare it.
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c
index 088efd0943d..9b20b3ae503 100644
--- a/gcc/ifcvt.c
+++ b/gcc/ifcvt.c
@@ -73,6 +73,7 @@ static sbitmap *post_dominators;
 static int count_bb_insns		PARAMS ((basic_block));
 static rtx first_active_insn		PARAMS ((basic_block));
 static int last_active_insn_p		PARAMS ((basic_block, rtx));
+static int seq_contains_jump		PARAMS ((rtx));
 
 static int cond_exec_process_insns	PARAMS ((rtx, rtx, rtx, rtx, int));
 static rtx cond_exec_get_condition	PARAMS ((rtx));
@@ -173,6 +174,24 @@ last_active_insn_p (bb, insn)
 
   return GET_CODE (insn) == JUMP_INSN;
 }
+
+/* It is possible, especially when having dealt with multi-word 
+   arithmetic, for the expanders to have emitted jumps.  Search
+   through the sequence and return TRUE if a jump exists so that
+   we can abort the conversion.  */
+
+static int
+seq_contains_jump (insn)
+     rtx insn;
+{
+  while (insn)
+    {
+      if (GET_CODE (insn) == JUMP_INSN)
+	return 1;
+      insn = NEXT_INSN (insn);
+    }
+  return 0;
+}
 
 /* Go through a bunch of insns, converting them to conditional
    execution format if possible.  Return TRUE if all of the non-note
@@ -637,6 +656,10 @@ noce_try_store_flag_constants (if_info)
 
       seq = get_insns ();
       end_sequence ();
+
+      if (seq_contains_jump (seq))
+	return FALSE;
+
       emit_insns_before (seq, if_info->cond_earliest);
 
       return TRUE;
@@ -691,6 +714,10 @@ noce_try_store_flag_inc (if_info)
 
 	  seq = get_insns ();
 	  end_sequence ();
+
+	  if (seq_contains_jump (seq))
+	    return FALSE;
+
 	  emit_insns_before (seq, if_info->cond_earliest);
 
 	  return TRUE;
@@ -738,6 +765,10 @@ noce_try_store_flag_mask (if_info)
 
 	  seq = get_insns ();
 	  end_sequence ();
+
+	  if (seq_contains_jump (seq))
+	    return FALSE;
+
 	  emit_insns_before (seq, if_info->cond_earliest);
 
 	  return TRUE;