[PATCH, committed] Fortran: fix wrong array bounds check [PR113471]

[PATCH, committed] Fortran: fix wrong array bounds check [PR113471]

[Harald Anlauf]

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Dear all,

I've pushed the attached obvious patch for a regression due to a
wrong array bounds check after regtesting on x86_64-pc-linux-gnu
and verification of the fix by the reporter in the PR.

https://gcc.gnu.org/g:94b2e6cb1cc4feb122bf77f19a657c97bffa9b42

Thanks,
Harald


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From 94b2e6cb1cc4feb122bf77f19a657c97bffa9b42 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Fri, 19 Jan 2024 21:20:44 +0100
Subject: [PATCH] Fortran: fix wrong array bounds check [PR113471]

gcc/fortran/ChangeLog:

	PR fortran/113471
	* trans-array.cc (array_bound_check_elemental): Array bounds check
	shall apply here to elemental dimensions of an array section only.

gcc/testsuite/ChangeLog:

	PR fortran/113471
	* gfortran.dg/bounds_check_24.f90: New test.
---
 gcc/fortran/trans-array.cc                    |  2 +-
 gcc/testsuite/gfortran.dg/bounds_check_24.f90 | 28 +++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gfortran.dg/bounds_check_24.f90

diff --git a/gcc/fortran/trans-array.cc b/gcc/fortran/trans-array.cc
index 26e7adaa03f..878a92aff18 100644
--- a/gcc/fortran/trans-array.cc
+++ b/gcc/fortran/trans-array.cc
@@ -3600,7 +3600,7 @@ array_bound_check_elemental (gfc_se * se, gfc_ss * ss, gfc_expr * expr)
 	      continue;
 	    }

-	  if (ref->type == REF_ARRAY && ref->u.ar.dimen > 0)
+	  if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
 	    {
 	      ar = &ref->u.ar;
 	      for (dim = 0; dim < ar->dimen; dim++)
diff --git a/gcc/testsuite/gfortran.dg/bounds_check_24.f90 b/gcc/testsuite/gfortran.dg/bounds_check_24.f90
new file mode 100644
index 00000000000..d0251e8455b
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/bounds_check_24.f90
@@ -0,0 +1,28 @@
+! { dg-do compile }
+! { dg-additional-options "-fcheck=bounds -fdump-tree-original" }
+!
+! PR fortran/113471 - wrong array bounds check
+
+program pr113471
+  implicit none
+  type t
+     integer, dimension(2) :: c1 = 0
+  end type t
+  type(t) :: cc(7), bb(7)
+  integer :: kk = 1
+
+  ! no bounds check (can be determined at compile time):
+  call foo (cc(7)% c1)
+
+  ! bounds check involving kk, but no "outside of expected range"
+  call foo (bb(kk)% c1)
+
+contains
+  subroutine foo (c)
+    integer, intent(in) :: c(:)
+  end
+end
+
+! { dg-final { scan-tree-dump-times "below lower bound" 2 "original" } }
+! { dg-final { scan-tree-dump-times "above upper bound" 2 "original" } }
+! { dg-final { scan-tree-dump-not "outside of expected range" "original" } }
--
2.35.3