PR rtl-optimization/27735

	* cfgloopmanip.c (fix_loop_placements, fix_bb_placements, unloop):
	Add new argument to keep track of whether an irreducible region
	was affected.  All callers changed.
	(fix_irreducible_loops): Removed.
	(remove_path): Call mark_irreducible_loops if EDGE_IRREDUCIBLE_LOOP
	flags were invalidated.

	* gcc.dg/loop-unswitch-1.c: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116582 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 34 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/loop-unswitch-1.c b/gcc/testsuite/gcc.dg/loop-unswitch-1.c
new file mode 100644
index 00000000000..930364c8175
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/loop-unswitch-1.c
@@ -0,0 +1,34 @@
+/* For PR rtl-optimization/27735  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -funswitch-loops" } */
+
+void set_color(void);
+void xml_colorize_line(unsigned int *p, int state)
+{
+  int c;
+  switch(state) 
+    {
+    case 1:
+      goto parse_tag;
+    case 2:
+      goto parse_comment;
+    }
+
+  for(;;) 
+    {
+      c = *p;  
+      if (c == '<' && state == 0) 
+	{
+parse_comment: ;
+	  while (*p != '\n') 
+	    state = 3;
+parse_tag: ;
+	  while (*p != '\n') 
+	    state = 0;
+	  set_color();
+	}
+      else
+	p++;
+    }
+}
+