[PATCH] Ignore debug insns with CONCAT and CONCATN for insn scheduling

["H.J. Lu" <hjl.tools@gmail.com>]

CONCAT and CONCATN never appear in the insn chain.  They are only used
in debug insn.  Ignore debug insns with CONCAT and CONCATN for insn
scheduling to avoid different insn orders with and without debug insn.

gcc/

	PR rtl-optimization/106746
	* sched-deps.cc (sched_analyze_2): Ignore debug insns with CONCAT
	and CONCATN.

gcc/testsuite/

	PR rtl-optimization/106746
	* gcc.dg/pr106746.c: New test.
---
 gcc/sched-deps.cc               | 14 ++++++++++++++
 gcc/testsuite/gcc.dg/pr106746.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/pr106746.c

diff --git a/gcc/sched-deps.cc b/gcc/sched-deps.cc
index 948aa0c3b60..b472e4fbb09 100644
--- a/gcc/sched-deps.cc
+++ b/gcc/sched-deps.cc
@@ -2794,6 +2794,20 @@ sched_analyze_2 (class deps_desc *deps, rtx x, rtx_insn *insn)
 
       return;
 
+    case VAR_LOCATION:
+      if (GET_CODE (PAT_VAR_LOCATION_LOC (x)) == CONCAT
+	  || GET_CODE (PAT_VAR_LOCATION_LOC (x)) == CONCATN)
+	{
+	  /* CONCAT and CONCATN never appear in the insn chain.  They
+	     are only used in debug insn.  Ignore insns with CONCAT and
+	     CONCATN for insn scheduling to avoid different insn orders
+	     with and without debug insn.  */
+	  if (cslr_p && sched_deps_info->finish_rhs)
+	    sched_deps_info->finish_rhs ();
+	  return;
+	}
+      break;
+
     default:
       break;
     }
diff --git a/gcc/testsuite/gcc.dg/pr106746.c b/gcc/testsuite/gcc.dg/pr106746.c
new file mode 100644
index 00000000000..1fc29de28c3
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr106746.c
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+/* { dg-options "-Wno-psabi -O2 -fsched2-use-superblocks -fcompare-debug" } */
+typedef char __attribute__((__vector_size__ (64))) U;
+typedef short __attribute__((__vector_size__ (64))) V;
+typedef int __attribute__((__vector_size__ (64))) W;
+
+char c;
+U a;
+U *r;
+W foo0_v512u32_0;
+
+void
+foo (W)
+{
+  U u;
+  V v;
+  W w = __builtin_shuffle (foo0_v512u32_0, foo0_v512u32_0);
+  u = __builtin_shufflevector (a, u, 3, 0, 4, 9, 9, 6,
+			       7, 8, 5, 0, 6, 1, 8, 1,
+			       2, 8, 6, 1, 8, 4, 9, 3,
+			       8, 4, 6, 0, 9, 0, 1, 8,
+			       2, 3, 3, 0, 4, 9, 9, 6,
+			       7, 8, 5, 0, 6, 1, 8, 1,
+			       2, 8, 6, 1, 8, 4, 9, 3,
+			       8, 4, 6, 0, 9, 0, 1, 8,
+			       2, 3);
+  v *= c;
+  w &= c;
+  *r = (U) v + (U) w;
+}
-- 
2.37.2