function.c (thread_prologue_and_epilogue_insns): Avoid fallthru flag on edge to exit.

	* function.c (thread_prologue_and_epilogue_insns): Avoid
	fallthru flag on edge to exit.

	* i386.md (trunc?fsi splitter): Conditionionize for non-sse.

	* flow.c (delete_noop_moves, propagate_block_delete_insn): Purge
	dead edges.

From-SVN: r45135

gcc/ChangeLog

+Thu Aug 23 17:21:43 CEST 2001  Jan Hubicka  <jh@suse.cz>
+
+	* function.c (thread_prologue_and_epilogue_insns): Avoid
+	fallthru flag on edge to exit.
+
+	* i386.md (trunc?fsi splitter): Conditionionize for non-sse.
+
+	* flow.c (delete_noop_moves, propagate_block_delete_insn): Purge
+	dead edges.
+
 2001-08-23  Lars Brinkhoff  <lars@nocrew.org>
 
 	* config/mcore/mcore.h (MACHINE_DEPENDENT_SIMPLIFY): Remove.

gcc/config/i386/i386.md

@@ -4818,7 +4818,7 @@
    && !reload_completed && !reload_in_progress
    && !SSE_FLOAT_MODE_P (GET_MODE (operands[1]))"
   "#"
-  ""
+  "&& 1"
   [(const_int 0)]
 {
   operands[2] = assign_386_stack_local (HImode, 1);

gcc/flow.c

@@ -4663,6 +4663,8 @@ delete_noop_moves (f)
 	      PUT_CODE (insn, NOTE);
 	      NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
 	      NOTE_SOURCE_FILE (insn) = 0;
+	      if (insn == bb->end)
+		purge_dead_edges (bb);
 	    }
 	}
     }
@@ -5250,7 +5252,10 @@ propagate_block_delete_insn (bb, insn)
     }
 
   if (bb->end == insn)
-    bb->end = PREV_INSN (insn);
+    {
+      bb->end = PREV_INSN (insn);
+      purge_dead_edges (bb);
+    }
   flow_delete_insn (insn);
 }
 

gcc/function.c

@@ -7336,6 +7336,7 @@ thread_prologue_and_epilogue_insns (f)
 	  emit_barrier_after (last->end);
 	  emit_return_into_block (last, epilogue_line_note);
 	  epilogue_end = last->end;
+	  last->succ->flags &= ~EDGE_FALLTHRU;
 	  goto epilogue_done;
 	}
     }