PR target/79080

	* loop-doloop.c (doloop_modify): Call unshare_all_rtl_in_chain on
	sequence.  Formatting fixes.
	(doloop_optimize): Formatting fixes.

	* gcc.dg/pr79080.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@244506 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 36 insertions, 6 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a69094cb506..cc2e1d0c9f0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2017-01-16  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/79080
+	* loop-doloop.c (doloop_modify): Call unshare_all_rtl_in_chain on
+	sequence.  Formatting fixes.
+	(doloop_optimize): Formatting fixes.
+
 	PR driver/49726
 	* gcc.c (debug_level_greater_than_spec_func): New function.
 	(static_spec_functions): Add debug-level-gt spec function.
diff --git a/gcc/loop-doloop.c b/gcc/loop-doloop.c
index 5616709776e..3b9a96034ab 100644
--- a/gcc/loop-doloop.c
+++ b/gcc/loop-doloop.c
@@ -479,9 +479,13 @@ doloop_modify (struct loop *loop, struct niter_desc *desc,
 
   /* Insert initialization of the count register into the loop header.  */
   start_sequence ();
+  /* count has been already copied through copy_rtx.  */
+  reset_used_flags (count);
+  set_used_flags (condition);
   tmp = force_operand (count, counter_reg);
   convert_move (counter_reg, tmp, 1);
   sequence = get_insns ();
+  unshare_all_rtl_in_chain (sequence);
   end_sequence ();
   emit_insn_after (sequence, BB_END (loop_preheader_edge (loop)->src));
 
@@ -489,10 +493,8 @@ doloop_modify (struct loop *loop, struct niter_desc *desc,
     {
       rtx ass = copy_rtx (desc->noloop_assumptions);
       basic_block preheader = loop_preheader_edge (loop)->src;
-      basic_block set_zero
-	      = split_edge (loop_preheader_edge (loop));
-      basic_block new_preheader
-	      = split_edge (loop_preheader_edge (loop));
+      basic_block set_zero = split_edge (loop_preheader_edge (loop));
+      basic_block new_preheader = split_edge (loop_preheader_edge (loop));
       edge te;
 
       /* Expand the condition testing the assumptions and if it does not pass,
@@ -688,8 +690,7 @@ doloop_optimize (struct loop *loop)
   rtx_insn *doloop_seq = targetm.gen_doloop_end (doloop_reg, start_label);
 
   word_mode_size = GET_MODE_PRECISION (word_mode);
-  word_mode_max
-	  = (HOST_WIDE_INT_1U << (word_mode_size - 1) << 1) - 1;
+  word_mode_max = (HOST_WIDE_INT_1U << (word_mode_size - 1) << 1) - 1;
   if (! doloop_seq
       && mode != word_mode
       /* Before trying mode different from the one in that # of iterations is
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index e8f00c195a7..2ac159733c4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/79080
+	* gcc.dg/pr79080.c: New test.
+
 2017-01-16  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c/78304
diff --git a/gcc/testsuite/gcc.dg/pr79080.c b/gcc/testsuite/gcc.dg/pr79080.c
new file mode 100644
index 00000000000..de0969d4647
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr79080.c
@@ -0,0 +1,19 @@
+/* PR target/79080 */
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+/* { dg-additional-options "-mcpu=8548" { target { powerpc*-*-* && ilp32 } } } */
+
+int
+foo (char x)
+{
+  int a;
+
+  for (;;)
+    {
+      x += 59;
+      if (x != 0)
+        a = 0;
+      else
+        return 0;
+    }
+}