re PR rtl-optimization/84989 (_mm512_broadcast_f32x4 triggers ICE in…

re PR rtl-optimization/84989 (_mm512_broadcast_f32x4 triggers ICE in simplify_const_unary_operation, at simplify-rtx.c:1731)

	PR rtl-optimization/84989
	* simplify-rtx.c (simplify_unary_operation_1): Don't try to simplify
	VEC_DUPLICATE with scalar result mode.

	* gcc.target/i386/pr84989.c: New test.

From-SVN: r258709

gcc/ChangeLog

+2018-03-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/84989
+	* simplify-rtx.c (simplify_unary_operation_1): Don't try to simplify
+	VEC_DUPLICATE with scalar result mode.
+
 2018-03-21  Martin Liska  <mliska@suse.cz>
 
 	PR ipa/84963

gcc/simplify-rtx.c

@@ -1692,7 +1692,9 @@ simplify_unary_operation_1 (enum rtx_code code, machine_mode mode, rtx op)
       break;
     }
 
-  if (VECTOR_MODE_P (mode) && vec_duplicate_p (op, &elt))
+  if (VECTOR_MODE_P (mode)
+      && vec_duplicate_p (op, &elt)
+      && code != VEC_DUPLICATE)
     {
       /* Try applying the operator to ELT and see if that simplifies.
 	 We can duplicate the result if so.

gcc/testsuite/ChangeLog

+2018-03-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/84989
+	* gcc.target/i386/pr84989.c: New test.
+
 2018-03-21  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* gcc.target/arm/pr82518.c: Require arm_neon_hw.

gcc/testsuite/gcc.target/i386/pr84989.c

+/* PR rtl-optimization/84989 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512f" } */
+
+#include <x86intrin.h>
+
+__m512
+foo (float a, float *b)
+{
+  return _mm512_sub_ps (_mm512_broadcast_f32x4 (_mm_load_ps (b)),
+			_mm512_broadcast_f32x4 (_mm_set1_ps (a)));
+}