re PR middle-end/87138 (wrong code with TI multiplication with -O -march=k8…

re PR middle-end/87138 (wrong code with TI multiplication with -O -march=k8 -fno-tree-fre -mavx512bw)

	PR middle-end/87138
	* expmed.c (expand_mult_const): Use immed_wide_int_const instead of
	gen_int_mode.  Formatting fixes.

	* gcc.target/i386/avx512bw-pr87138.c: New test.

From-SVN: r264009

gcc/ChangeLog

+2018-08-31  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/87138
+	* expmed.c (expand_mult_const): Use immed_wide_int_const instead of
+	gen_int_mode.  Formatting fixes.
+
 2018-08-30  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* target.def (custom_function_descriptors): Improve documentation.

gcc/expmed.c

@@ -3347,19 +3347,21 @@ expand_mult_const (machine_mode mode, rtx op0, HOST_WIDE_INT val,
 	  /* Write a REG_EQUAL note on the last insn so that we can cse
 	     multiplication sequences.  Note that if ACCUM is a SUBREG,
 	     we've set the inner register and must properly indicate that.  */
-          tem = op0, nmode = mode;
-          accum_inner = accum;
-          if (GET_CODE (accum) == SUBREG)
+	  tem = op0, nmode = mode;
+	  accum_inner = accum;
+	  if (GET_CODE (accum) == SUBREG)
 	    {
 	      accum_inner = SUBREG_REG (accum);
 	      nmode = GET_MODE (accum_inner);
 	      tem = gen_lowpart (nmode, op0);
 	    }
 
-          insn = get_last_insn ();
-          set_dst_reg_note (insn, REG_EQUAL,
-			    gen_rtx_MULT (nmode, tem,
-					  gen_int_mode (val_so_far, nmode)),
+	  insn = get_last_insn ();
+	  wide_int wval_so_far
+	    = wi::uhwi (val_so_far,
+			GET_MODE_PRECISION (as_a <scalar_mode> (nmode)));
+	  rtx c = immed_wide_int_const (wval_so_far, nmode);
+	  set_dst_reg_note (insn, REG_EQUAL, gen_rtx_MULT (nmode, tem, c),
 			    accum_inner);
 	}
     }

gcc/testsuite/ChangeLog

+2018-08-31  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/87138
+	* gcc.target/i386/avx512bw-pr87138.c: New test.
+
 2018-08-31  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/86328

gcc/testsuite/gcc.target/i386/avx512bw-pr87138.c

+/* PR middle-end/87138 */
+/* { dg-do run { target int128 } } */
+/* { dg-options "-O -fno-tree-fre -mavx512bw -mtune=k8" } */
+/* { dg-require-effective-target avx512bw } */
+
+#include "avx512bw-check.h"
+
+typedef int U __attribute__ ((vector_size (64)));
+typedef __int128 V __attribute__ ((vector_size (64)));
+V g, i;
+
+static inline void
+foo (unsigned h, V j, U k, V n)
+{
+  k /= h;
+  __builtin_memmove (&h, &n, 1);
+  n[j[1]] *= 0x7FFFFFFFFFFFFFFF;
+  j[k[5]] = 0;
+  g = n;
+  i = h + j + n;
+}
+
+void
+avx512bw_test ()
+{
+  foo (~0, (V) { }, (U) { 5 }, (V) { 3 });
+  if (g[0] != (__int128) 3 * 0x7FFFFFFFFFFFFFFF)
+    abort ();
+}