re PR target/91469 (ICE in extract_insn, at recog.c:2310 since r274481)

2019-08-16  Richard Biener  <rguenther@suse.de>

	PR target/91469
	* config/i386/i386-features.c
	(general_scalar_chain::replace_with_subreg): Stop at memory operands.

	* gcc.target/i386/pr91469-1.c: New testcase.
	* gcc.target/i386/pr91469-2.c: Likewise.

From-SVN: r274570

gcc/ChangeLog

+2019-08-16  Richard Biener  <rguenther@suse.de>
+
+	PR target/91469
+	* config/i386/i386-features.c
+	(general_scalar_chain::replace_with_subreg): Stop at memory operands.
+
 2019-08-16  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	PR other/91255

gcc/config/i386/i386-features.c

@@ -613,6 +613,10 @@ general_scalar_chain::replace_with_subreg (rtx x, rtx reg, rtx new_reg)
   if (x == reg)
     return gen_rtx_SUBREG (vmode, new_reg, 0);
 
+  /* But not in memory addresses.  */
+  if (MEM_P (x))
+    return x;
+
   const char *fmt = GET_RTX_FORMAT (GET_CODE (x));
   int i, j;
   for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)

gcc/testsuite/ChangeLog

+2019-08-16  Richard Biener  <rguenther@suse.de>
+
+	PR target/91469
+	* gcc.target/i386/pr91469-1.c: New testcase.
+	* gcc.target/i386/pr91469-2.c: Likewise.
+
 2019-08-16  Mark Eggleston <mark.eggleston@codethink.com>
 
 	* gfortran.dg/auto_in_equiv_1.f90: New test.

gcc/testsuite/gcc.target/i386/pr91469-1.c

+/* { dg-do compile } */
+/* { dg-options "-funroll-loops -O2 -fno-gcse -mavx512vbmi -fno-ivopts -mstv" } */
+
+int a, b, e;
+long long c;
+int d[6];
+
+void fn1() {
+    int i;
+    unsigned f;
+    c = a;
+    f = i;
+    for (; i < b; i++)
+      if (d[i] > f)
+	f = d[i];
+    e = f;
+}

gcc/testsuite/gcc.target/i386/pr91469-2.c

+/* { dg-do compile } */
+/* { dg-options "-Os --param scev-max-expr-size=0 -mavx512vnni -funroll-all-loops" } */
+
+int a, b, c, d;
+int *e;
+void fn1()
+{
+  b = c > 0 ? c : 0;
+  d += e[b];
+  a = d > 0 ? d : 0;
+}