Hello world, the attached patch fixes a bug, partly an 8 regression, for simplifying an expression containing minloc or maxloc.
The underlying problem was that integer, dimension(0), parameter :: z=0 ended up as EXPR_CONSTANT even though the rank was one, which was then passed to the simplification routines, which either ICEd or gave wrong results. In doing this, I had to change the logic of the is_size_zero_array function. Trying to call it from within the simplification rountines led to the simplification routines to be called, and so on... until the stack ran out. As soon as this is committed, I'll also look if there is anything left in PR66128, and close that bug if appropriate Regression-tested. OK for trunk? 2017-03-06 Thomas Koenig <tkoe...@gcc.gnu.org> PR fortran/84697 PR fortran/66128 * expr.c (simplify_parameter_variable): If p is a size zero array and not an ARRAY_EXPR insert an empty array constructor and return. * gfortran.h: Add prototype for gfc_is_size_zero_array. * simplify.c (is_size_zero_array): Make non-static and rename into (gfc_is_size_zero_array): Check for parameter arrays of zero size by comparing shape and absence of constructor. (gfc_simplify_all): Use gfc_is_size_zero_array instead of is_size_zero_array. (gfc_simplify_count): Likewise. (gfc_simplify_iall): Likewise. (gfc_simplify_iany): Likewise. (gfc_simplify_iparity): Likewise. (gfc_simplify_minval): Likewise. (gfc_simplify_maxval): Likewise. (gfc_simplify_product): Likewise. (gfc_simplify_sum): Likewise. 2017-03-06 Thomas Koenig <tkoe...@gcc.gnu.org> PR fortran/84697 PR fortran/66128 * gfortran.dg/minmaxloc_zerosize_1.f90: New test.
Index: expr.c =================================================================== --- expr.c (Revision 258264) +++ expr.c (Arbeitskopie) @@ -1857,6 +1857,22 @@ simplify_parameter_variable (gfc_expr *p, int type gfc_expr *e; bool t; + if (gfc_is_size_zero_array (p)) + { + if (p->expr_type == EXPR_ARRAY) + return true; + + e = gfc_get_expr (); + e->expr_type = EXPR_ARRAY; + e->ts = p->ts; + e->rank = p->rank; + e->value.constructor = NULL; + e->shape = gfc_copy_shape (p->shape, p->rank); + e->where = p->where; + gfc_replace_expr (p, e); + return true; + } + e = gfc_copy_expr (p->symtree->n.sym->value); if (e == NULL) return false; Index: gfortran.h =================================================================== --- gfortran.h (Revision 258264) +++ gfortran.h (Arbeitskopie) @@ -3464,6 +3464,7 @@ int gfc_code_walker (gfc_code **, walk_code_fn_t, void gfc_convert_mpz_to_signed (mpz_t, int); gfc_expr *gfc_simplify_ieee_functions (gfc_expr *); +bool gfc_is_size_zero_array (gfc_expr *); /* trans-array.c */ Index: simplify.c =================================================================== --- simplify.c (Revision 258264) +++ simplify.c (Arbeitskopie) @@ -259,26 +259,28 @@ is_constant_array_expr (gfc_expr *e) } /* Test for a size zero array. */ -static bool -is_size_zero_array (gfc_expr *array) +bool +gfc_is_size_zero_array (gfc_expr *array) { - gfc_expr *e; - bool t; - e = gfc_copy_expr (array); - gfc_simplify_expr (e, 1); + if (array->rank == 0) + return false; - if (e->expr_type == EXPR_CONSTANT && e->rank > 0 && !e->shape) - t = true; - else if (e->expr_type == EXPR_ARRAY && e->rank > 0 - && !e->shape && !e->value.constructor) - t = true; - else - t = false; + if (array->expr_type == EXPR_VARIABLE && array->rank > 0 + && array->symtree->n.sym->attr.flavor == FL_PARAMETER + && array->shape != NULL) + { + for (int i = 0; i < array->rank; i++) + if (mpz_cmp_si (array->shape[i], 0) <= 0) + return true; - gfc_free_expr (e); + return false; + } - return t; + if (array->expr_type == EXPR_ARRAY) + return array->value.constructor == NULL; + + return false; } @@ -974,7 +976,7 @@ gfc_simplify_aint (gfc_expr *e, gfc_expr *k) gfc_expr * gfc_simplify_all (gfc_expr *mask, gfc_expr *dim) { - if (is_size_zero_array (mask)) + if (gfc_is_size_zero_array (mask)) return gfc_get_logical_expr (mask->ts.kind, &mask->where, true); return simplify_transformation (mask, dim, NULL, true, gfc_and); @@ -1066,7 +1068,7 @@ gfc_simplify_and (gfc_expr *x, gfc_expr *y) gfc_expr * gfc_simplify_any (gfc_expr *mask, gfc_expr *dim) { - if (is_size_zero_array (mask)) + if (gfc_is_size_zero_array (mask)) return gfc_get_logical_expr (mask->ts.kind, &mask->where, false); return simplify_transformation (mask, dim, NULL, false, gfc_or); @@ -1965,7 +1967,7 @@ gfc_simplify_count (gfc_expr *mask, gfc_expr *dim, { gfc_expr *result; - if (is_size_zero_array (mask)) + if (gfc_is_size_zero_array (mask)) { int k; k = kind ? mpz_get_si (kind->value.integer) : gfc_default_integer_kind; @@ -3263,7 +3265,7 @@ do_bit_and (gfc_expr *result, gfc_expr *e) gfc_expr * gfc_simplify_iall (gfc_expr *array, gfc_expr *dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) return gfc_get_int_expr (array->ts.kind, NULL, -1); return simplify_transformation (array, dim, mask, -1, do_bit_and); @@ -3285,7 +3287,7 @@ do_bit_ior (gfc_expr *result, gfc_expr *e) gfc_expr * gfc_simplify_iany (gfc_expr *array, gfc_expr *dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) return gfc_get_int_expr (array->ts.kind, NULL, 0); return simplify_transformation (array, dim, mask, 0, do_bit_ior); @@ -3728,7 +3730,7 @@ do_bit_xor (gfc_expr *result, gfc_expr *e) gfc_expr * gfc_simplify_iparity (gfc_expr *array, gfc_expr *dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) return gfc_get_int_expr (array->ts.kind, NULL, 0); return simplify_transformation (array, dim, mask, 0, do_bit_xor); @@ -5038,7 +5040,7 @@ gfc_min (gfc_expr *op1, gfc_expr *op2) gfc_expr * gfc_simplify_minval (gfc_expr *array, gfc_expr* dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) { gfc_expr *result; int i; @@ -5094,7 +5096,7 @@ gfc_max (gfc_expr *op1, gfc_expr *op2) gfc_expr * gfc_simplify_maxval (gfc_expr *array, gfc_expr* dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) { gfc_expr *result; int i; @@ -5776,7 +5778,7 @@ gfc_simplify_norm2 (gfc_expr *e, gfc_expr *dim) { gfc_expr *result; - if (is_size_zero_array (e)) + if (gfc_is_size_zero_array (e)) { gfc_expr *result; result = gfc_get_constant_expr (e->ts.type, e->ts.kind, &e->where); @@ -6040,7 +6042,7 @@ gfc_simplify_precision (gfc_expr *e) gfc_expr * gfc_simplify_product (gfc_expr *array, gfc_expr *dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) { gfc_expr *result; @@ -7384,7 +7386,7 @@ gfc_simplify_sqrt (gfc_expr *e) gfc_expr * gfc_simplify_sum (gfc_expr *array, gfc_expr *dim, gfc_expr *mask) { - if (is_size_zero_array (array)) + if (gfc_is_size_zero_array (array)) { gfc_expr *result;
! { dg-do run } ! { dg-additional-options "-fdump-tree-original" } program main implicit none integer, parameter :: z(0) = 0 integer, parameter, dimension(1) :: a = minloc(z) integer, parameter, dimension(1) :: b = minloc(z,mask=z>0) integer, parameter :: c = minloc(z,dim=1) integer, parameter, dimension(1) :: d = maxloc(z) integer, parameter, dimension(1) :: e = maxloc(z,mask=z>0) integer, parameter :: f = maxloc(z,dim=1) character(len=12) line if (a(1) /= 0) stop 1 if (b(1) /= 0) stop 2 if (c /= 0) stop 3 if (d(1) /= 0) stop 4 if (e(1) /= 0) stop 5 if (f /= 0) stop 6 write (unit=line,fmt='(6I2)') minloc(z), minloc(z,mask=z>0), minloc(z,dim=1), & maxloc(z), maxloc(z,mask=z<0), maxloc(z,dim=1) if (line /= ' 0 0 0 0 0 0') stop 7 end program main ! { dg-final { scan-tree-dump-times "_gfortran_stop" 1 "original" } }