Properly store 128-bit constant in large model

When converting TI store with CONST_INT to V1TI store with CONST_VECTOR
in large model, an extra instruction may be needed to load CONST_VECTOR
into a register.  Insert the extra instruction to the right place.

gcc/

	PR target/79498
	* config/i386/i386.c (timode_scalar_chain::convert_insn): Insert
	the extra instruction to the right place to store 128-bit constant
	when needed.

gcc/testsuite/

	PR target/79498
	* gcc.target/i386/pr79498.c: New test.

From-SVN: r245438

gcc/ChangeLog

+2017-02-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/79498
+	* config/i386/i386.c (timode_scalar_chain::convert_insn): Insert
+	the extra instruction to the right place to store 128-bit constant
+	when needed.
+
 2017-02-14  Martin Sebor  <msebor@redhat.com>
 
 	PR middle-end/79448

gcc/config/i386/i386.c

@@ -3956,8 +3956,13 @@ timode_scalar_chain::convert_insn (rtx_insn *insn)
 	  /* Since there are no instructions to store 128-bit constant,
 	     temporary register usage is required.  */
 	  rtx tmp = gen_reg_rtx (V1TImode);
+	  start_sequence ();
 	  src = gen_rtx_CONST_VECTOR (V1TImode, gen_rtvec (1, src));
 	  src = validize_mem (force_const_mem (V1TImode, src));
+	  rtx_insn *seq = get_insns ();
+	  end_sequence ();
+	  if (seq)
+	    emit_insn_before (seq, insn);
 	  emit_conversion_insns (gen_rtx_SET (dst, tmp), insn);
 	  dst = tmp;
 	}

gcc/testsuite/ChangeLog

+2017-02-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/79498
+	* gcc.target/i386/pr79498.c: New test.
+
 2017-02-14  Martin Sebor  <msebor@redhat.com>
 
 	PR middle-end/79448

gcc/testsuite/gcc.target/i386/pr79498.c

+/* PR target/79498 */
+/* { dg-do compile { target lp64 } } */
+/* { dg-options "-O2 -mno-avx512f -mcmodel=large -Wno-psabi" } */
+
+typedef unsigned U __attribute__ ((vector_size (64)));
+typedef unsigned __int128 V __attribute__ ((vector_size (64)));
+
+static inline V
+bar (U u, U x, V v)
+{
+  v = (V)(U) { 0, ~0 };
+  v[x[0]] <<= u[-63];
+  return v;
+}
+
+V
+foo (U u)
+{
+  return bar (u, (U) {}, (V) {});
+}