PR fortran/95979 - ICE in get_kind, at fortran/simplify.c:129

Simplification of the elemental intrinsic INDEX with constant array-valued
arguments failed with an ICE or did not reduce to a constant array, depending
also on the presence of the optional KIND argument.  Add a further attempt of
simplification in the case of elemental intrinsics, and make sure the KIND
argument is not removed prematurely during simplification of INDEX.

gcc/fortran/ChangeLog:

	PR fortran/95979
	* expr.c (gfc_check_init_expr): Fix check of return code from
	gfc_intrinsic_func_interface.
	* intrinsic.c (gfc_intrinsic_func_interface): Add further attempt
	of simplification of elemental intrinsics with array arguments.
	* iresolve.c (gfc_resolve_index_func): Keep optional KIND argument
	for simplification of elemental use of INDEX.

gcc/testsuite/ChangeLog:

	PR fortran/95979
	* gfortran.dg/index_4.f90: New test.

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/fortran/intrinsic.c b/gcc/fortran/intrinsic.c
index ef33587..f4dfcf7 100644
--- a/gcc/fortran/intrinsic.c
+++ b/gcc/fortran/intrinsic.c
@@ -5038,6 +5038,11 @@ got_specific:
   if (!sym->module)
     gfc_intrinsic_symbol (sym);
 
+  /* Have another stab at simplification since elemental intrinsics with array
+     actual arguments would be missed by the calls above to do_simplify.  */
+  if (isym->elemental)
+    gfc_simplify_expr (expr, 1);
+
   return MATCH_YES;
 }