modulo-sched: fix branch scheduling issue (PR84032)

	PR rtl-optimization/84032
	* modulo-sched.c (ps_insn_find_column): Change condition so that
	branch will always be the last insn in a row inside partial
	schedule.

testsuite:

	PR rtl-optimization/84032
	* gcc.dg/pr84032.c: New test.

From-SVN: r270511

gcc/ChangeLog

+2019-04-23  Roman Zhuykov  <zhroma@ispras.ru>
+
+	PR rtl-optimization/84032
+	* modulo-sched.c (ps_insn_find_column): Change condition so that
+	branch will always be the last insn in a row inside partial
+	schedule.
+
 2019-04-23  Richard Biener  <rguenther@suse.de>
 
 	PR debug/90131

gcc/modulo-sched.c

@@ -2996,9 +2996,7 @@ ps_insn_find_column (partial_schedule_ptr ps, ps_insn_ptr ps_i,
             last_must_precede = next_ps_i;
         }
       /* The closing branch must be the last in the row.  */
-      if (must_precede 
-	  && bitmap_bit_p (must_precede, next_ps_i->id)
-	  && JUMP_P (ps_rtl_insn (ps, next_ps_i->id)))
+      if (JUMP_P (ps_rtl_insn (ps, next_ps_i->id)))
 	return false;
              
        last_in_row = next_ps_i;

gcc/testsuite/ChangeLog

+2019-04-23  Roman Zhuykov  <zhroma@ispras.ru>
+
+	PR rtl-optimization/84032
+	* gcc.dg/pr84032.c: New test.
+
 2018-04-23  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/90078
-	* gcc/testsuite/g++.dg/tree-ssa/pr90078.C: New test.
+	* g++.dg/tree-ssa/pr90078.C: New test.
 
 2018-04-23  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/90021
-	* gcc/testsuite/gfortran.dg/pr90021.f90: New test.
+	* gfortran.dg/pr90021.f90: New test.
 
 2019-04-22  Steven G. Kargl  <kargl@gcc.gnu.org>
 

gcc/testsuite/gcc.dg/pr84032.c

+/* PR rtl-optimization/84032 */
+/* { dg-do compile } */
+/* { dg-options "-O1 -fmodulo-sched" } */
+/* { dg-additional-options "-mcpu=power6" { target { powerpc-*-* } } } */
+
+void
+yr (int cm)
+{
+  int ka = cm;
+
+  for (;;)
+    {
+      short int m0;
+
+      for (m0 = 0; m0 < 6; ++m0)
+        {
+          ka &= 1;
+          cm *= 2;
+        }
+
+      ka = (ka == 0) ? cm : 0;
+    }
+}