re PR tree-optimization/92324 (ICE in expand_direct_optab_fn, at internal-fn.c:2890)

2019-11-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92324
	* tree-vect-loop.c (vect_create_epilog_for_reduction): Use
	STMT_VINFO_REDUC_VECTYPE for all computations, inserting
	sign-conversions as necessary.
	(vectorizable_reduction): Reject conversions in the chain
	that are not sign-conversions, base analysis on a non-converting
	stmt and its operation sign.  Set STMT_VINFO_REDUC_VECTYPE.
	* tree-vect-stmts.c (vect_stmt_relevant_p): Don't dump anything
	for debug stmts.
	* tree-vectorizer.h (_stmt_vec_info::reduc_vectype): New.
	(STMT_VINFO_REDUC_VECTYPE): Likewise.

	* gcc.dg/vect/pr92205.c: XFAIL.
	* gcc.dg/vect/pr92324-1.c: New testcase.
	* gcc.dg/vect/pr92324-2.c: Likewise.

From-SVN: r277958

gcc/testsuite/gcc.dg/vect/pr92324-1.c

+/* { dg-do compile } */
+
+unsigned a, b;
+int c, d;
+unsigned e(int f) {
+  if (a > f)
+    return a;
+  return f;
+}
+void g() {
+  for (; c; c++)
+    d = e(d);
+  b = d;
+}

gcc/testsuite/gcc.dg/vect/pr92324-2.c

+#include "tree-vect.h"
+
+unsigned b[1024];
+
+int __attribute__((noipa))
+foo (int n)
+{
+  int res = 0;
+  for (int i = 0; i < n; ++i)
+    res = res > b[i] ? res : b[i];
+  return res;
+}
+
+int main ()
+{
+  check_vect ();
+  b[15] = (unsigned)__INT_MAX__ + 1;
+  if (foo (16) != -__INT_MAX__ - 1)
+    __builtin_abort ();
+  return 0;
+}