[CI-NOTIFY]: TCWG Bisect tcwg_gnu/gnu-master-arm-bootstrap_debug - Build # 13 - Successful!

11 Jul 2021

Successfully identified regression in *gcc* in CI configuration tcwg_gnu/gnu-master-arm-bootstrap_debug.  So far, this commit has regressed CI configurations:
 - tcwg_gnu/gnu-master-arm-bootstrap_debug
Culprit:
<cut>
commit a110855667782dac7b674d3e328b253b3b3c919b
Author: Martin Sebor msebor@redhat.com
Date:   Wed Jul 7 14:05:25 2021 -0600
Correct handling of variable offset minus constant in -Warray-bounds [PR100137]
Resolves:
    PR tree-optimization/100137 - -Warray-bounds false positive on varying offset plus negative
    PR tree-optimization/99121 - ICE in -Warray-bounds on a multidimensional
    PR tree-optimization/97027 - missing warning on buffer overflow storing a larger scalar into a smaller array
gcc/ChangeLog:
PR tree-optimization/100137
            PR tree-optimization/99121
            PR tree-optimization/97027
            * builtins.c (access_ref::access_ref): Also set offmax.
            (access_ref::offset_in_range): Define new function.
            (access_ref::add_offset): Set offmax.
            (access_ref::inform_access): Handle access_none.
            (handle_mem_ref): Clear ostype.
            (compute_objsize_r): Handle ASSERT_EXPR.
            * builtins.h (struct access_ref): Add offmax member.
            * gimple-array-bounds.cc (array_bounds_checker::check_mem_ref): Use
            compute_objsize() and simplify.
gcc/testsuite/ChangeLog:
PR tree-optimization/100137
            PR tree-optimization/99121
            PR tree-optimization/97027
            * c-c++-common/Warray-bounds-3.c: Remove xfail
            * c-c++-common/Warray-bounds-4.c: Add an expected warning.
            * c-c++-common/Warray-bounds-9.c: New test.
            * c-c++-common/Warray-bounds-10.c: New test.
            * g++.dg/asan/asan_test.C: Suppress expected warnings.
            * g++.dg/pr95768.C: Same.
            * g++.dg/warn/Warray-bounds-10.C: Adjust text of expected messages.
            * g++.dg/warn/Warray-bounds-11.C: Same.
            * g++.dg/warn/Warray-bounds-12.C: Same.
            * g++.dg/warn/Warray-bounds-13.C: Same.
            * g++.dg/warn/Warray-bounds-17.C: Same.
            * g++.dg/warn/Warray-bounds-20.C: Same.
            * gcc.dg/Warray-bounds-29.c: Same.
            * gcc.dg/Warray-bounds-30.c: Add xfail.
            * gcc.dg/Warray-bounds-31.c: Adjust text of expected messages.
            * gcc.dg/Warray-bounds-32.c: Same.
            * gcc.dg/Warray-bounds-52.c: Same.
            * gcc.dg/Warray-bounds-53.c: Same.
            * gcc.dg/Warray-bounds-58.c: Remove xfail.
            * gcc.dg/Warray-bounds-63.c: Adjust text of expected messages.
            * gcc.dg/Warray-bounds-66.c: Same.
            * gcc.dg/Warray-bounds-69.c: Same.
            * gcc.dg/Wstringop-overflow-34.c: Same.
            * gcc.dg/Wstringop-overflow-47.c: Same.
            * gcc.dg/Wstringop-overflow-61.c: Same.
            * gcc.dg/Warray-bounds-77.c: New test.
            * gcc.dg/Warray-bounds-78.c: New test.
            * gcc.dg/Warray-bounds-79.c: New test.
</cut>
Results regressed to (for first_bad == a110855667782dac7b674d3e328b253b3b3c919b)
# reset_artifacts:
-10
# true:
0
# First few build errors in logs:
# 00:05:59 make[3]: [armv8l-unknown-linux-gnueabihf/bits/largefile-config.h] Error 1 (ignored)
# 00:11:36 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/tree.h:1089:58: error: array subscript -1 is outside array bounds of ‘cpp_hashnode [89478485]’ [-Werror=array-bounds]
# 00:11:37 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/tree.h:1089:58: error: array subscript -1 is outside array bounds of ‘cpp_hashnode [89478485]’ [-Werror=array-bounds]
# 00:11:37 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/tree.h:1089:58: error: array subscript -1 is outside array bounds of ‘cpp_hashnode [89478485]’ [-Werror=array-bounds]
# 00:12:06 make[3]: *** [cp/module.o] Error 1
# 00:17:43 make[2]: *** [all-stage2-gcc] Error 2
# 00:17:43 make[1]: *** [stage2-bubble] Error 2
# 00:17:43 make: *** [all] Error 2
from (for last_good == 6278065af07634278ba30029d92a82b089969baa)
# reset_artifacts:
-10
# true:
0
# build_abe bootstrap_debug:
1
Artifacts of last_good build: https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/...
Artifacts of first_bad build: https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/...
Build top page/logs: https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/
Configuration details:
Reproduce builds:
<cut>
mkdir investigate-gcc-a110855667782dac7b674d3e328b253b3b3c919b
cd investigate-gcc-a110855667782dac7b674d3e328b253b3b3c919b
git clone https://git.linaro.org/toolchain/jenkins-scripts
mkdir -p artifacts/manifests
curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/... --fail
curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/... --fail
curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/... --fail
chmod +x artifacts/test.sh
# Reproduce the baseline build (build all pre-requisites)
./jenkins-scripts/tcwg_gnu-build.sh @@ artifacts/manifests/build-baseline.sh
cd gcc
# Reproduce first_bad build
git checkout --detach a110855667782dac7b674d3e328b253b3b3c919b
../artifacts/test.sh
# Reproduce last_good build
git checkout --detach 6278065af07634278ba30029d92a82b089969baa
../artifacts/test.sh
cd ..
</cut>
History of pending regressions and results: https://git.linaro.org/toolchain/ci/base-artifacts.git/log/?h=linaro-local/c...
Artifacts: https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/...
Build log: https://ci.linaro.org/job/tcwg_gcc-bisect-gnu-master-arm-bootstrap_debug/13/...
Full commit (up to 1000 lines):
<cut>
commit a110855667782dac7b674d3e328b253b3b3c919b
Author: Martin Sebor msebor@redhat.com
Date:   Wed Jul 7 14:05:25 2021 -0600
Correct handling of variable offset minus constant in -Warray-bounds [PR100137]
Resolves:
    PR tree-optimization/100137 - -Warray-bounds false positive on varying offset plus negative
    PR tree-optimization/99121 - ICE in -Warray-bounds on a multidimensional
    PR tree-optimization/97027 - missing warning on buffer overflow storing a larger scalar into a smaller array
gcc/ChangeLog:
PR tree-optimization/100137
            PR tree-optimization/99121
            PR tree-optimization/97027
            * builtins.c (access_ref::access_ref): Also set offmax.
            (access_ref::offset_in_range): Define new function.
            (access_ref::add_offset): Set offmax.
            (access_ref::inform_access): Handle access_none.
            (handle_mem_ref): Clear ostype.
            (compute_objsize_r): Handle ASSERT_EXPR.
            * builtins.h (struct access_ref): Add offmax member.
            * gimple-array-bounds.cc (array_bounds_checker::check_mem_ref): Use
            compute_objsize() and simplify.
gcc/testsuite/ChangeLog:
PR tree-optimization/100137
            PR tree-optimization/99121
            PR tree-optimization/97027
            * c-c++-common/Warray-bounds-3.c: Remove xfail
            * c-c++-common/Warray-bounds-4.c: Add an expected warning.
            * c-c++-common/Warray-bounds-9.c: New test.
            * c-c++-common/Warray-bounds-10.c: New test.
            * g++.dg/asan/asan_test.C: Suppress expected warnings.
            * g++.dg/pr95768.C: Same.
            * g++.dg/warn/Warray-bounds-10.C: Adjust text of expected messages.
            * g++.dg/warn/Warray-bounds-11.C: Same.
            * g++.dg/warn/Warray-bounds-12.C: Same.
            * g++.dg/warn/Warray-bounds-13.C: Same.
            * g++.dg/warn/Warray-bounds-17.C: Same.
            * g++.dg/warn/Warray-bounds-20.C: Same.
            * gcc.dg/Warray-bounds-29.c: Same.
            * gcc.dg/Warray-bounds-30.c: Add xfail.
            * gcc.dg/Warray-bounds-31.c: Adjust text of expected messages.
            * gcc.dg/Warray-bounds-32.c: Same.
            * gcc.dg/Warray-bounds-52.c: Same.
            * gcc.dg/Warray-bounds-53.c: Same.
            * gcc.dg/Warray-bounds-58.c: Remove xfail.
            * gcc.dg/Warray-bounds-63.c: Adjust text of expected messages.
            * gcc.dg/Warray-bounds-66.c: Same.
            * gcc.dg/Warray-bounds-69.c: Same.
            * gcc.dg/Wstringop-overflow-34.c: Same.
            * gcc.dg/Wstringop-overflow-47.c: Same.
            * gcc.dg/Wstringop-overflow-61.c: Same.
            * gcc.dg/Warray-bounds-77.c: New test.
            * gcc.dg/Warray-bounds-78.c: New test.
            * gcc.dg/Warray-bounds-79.c: New test.
---
 gcc/builtins.c                                |  69 +++++-
 gcc/builtins.h                                |   5 +
 gcc/gimple-array-bounds.cc                    | 336 ++++----------------------
 gcc/testsuite/c-c++-common/Warray-bounds-10.c | 114 +++++++++
 gcc/testsuite/c-c++-common/Warray-bounds-3.c  |   4 +-
 gcc/testsuite/c-c++-common/Warray-bounds-4.c  |  12 +-
 gcc/testsuite/c-c++-common/Warray-bounds-9.c  | 144 +++++++++++
 gcc/testsuite/g++.dg/asan/asan_test.C         |   2 +-
 gcc/testsuite/g++.dg/pr95768.C                |   2 +-
 gcc/testsuite/g++.dg/warn/Warray-bounds-10.C  |   4 +-
 gcc/testsuite/g++.dg/warn/Warray-bounds-11.C  |   4 +-
 gcc/testsuite/g++.dg/warn/Warray-bounds-12.C  |   4 +-
 gcc/testsuite/g++.dg/warn/Warray-bounds-13.C  |   4 +-
 gcc/testsuite/g++.dg/warn/Warray-bounds-17.C  |   2 +-
 gcc/testsuite/g++.dg/warn/Warray-bounds-20.C  |   8 +-
 gcc/testsuite/gcc.dg/Warray-bounds-29.c       |  22 +-
 gcc/testsuite/gcc.dg/Warray-bounds-30.c       |   2 +-
 gcc/testsuite/gcc.dg/Warray-bounds-31.c       |   8 +-
 gcc/testsuite/gcc.dg/Warray-bounds-32.c       |  26 +-
 gcc/testsuite/gcc.dg/Warray-bounds-52.c       |   6 +-
 gcc/testsuite/gcc.dg/Warray-bounds-53.c       |   6 +-
 gcc/testsuite/gcc.dg/Warray-bounds-58.c       |   2 +-
 gcc/testsuite/gcc.dg/Warray-bounds-63.c       |   6 +-
 gcc/testsuite/gcc.dg/Warray-bounds-66.c       |  12 +-
 gcc/testsuite/gcc.dg/Warray-bounds-69.c       |   2 +-
 gcc/testsuite/gcc.dg/Warray-bounds-77.c       | 135 +++++++++++
 gcc/testsuite/gcc.dg/Warray-bounds-78.c       | 109 +++++++++
 gcc/testsuite/gcc.dg/Warray-bounds-79.c       | 112 +++++++++
 gcc/testsuite/gcc.dg/Wstringop-overflow-34.c  |   8 +-
 gcc/testsuite/gcc.dg/Wstringop-overflow-47.c  |  14 +-
 gcc/testsuite/gcc.dg/Wstringop-overflow-61.c  |   4 +-
 31 files changed, 817 insertions(+), 371 deletions(-)

diff --git a/gcc/builtins.c b/gcc/builtins.c
index e52fe4291c8..39ab139b7e1 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -206,6 +206,7 @@ access_ref::access_ref (tree bound /* = NULL_TREE */,
 {
   /* Set to valid.  */
   offrng[0] = offrng[1] = 0;
+  offmax[0] = offmax[1] = 0;
   /* Invalidate.   */
   sizrng[0] = sizrng[1] = -1;
@@ -457,6 +458,21 @@ access_ref::size_remaining (offset_int *pmin /* = NULL */) const
   return sizrng[1] - or0;
 }
+/* Return true if the offset and object size are in range for SIZE.  */
+
+bool
+access_ref::offset_in_range (const offset_int &size) const
+{
+  if (size_remaining () < size)
+    return false;
+
+  if (base0)
+    return offmax[0] >= 0 && offmax[1] <= sizrng[1];
+
+  offset_int maxoff = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
+  return offmax[0] > -maxoff && offmax[1] < maxoff;
+}
+
 /* Add the range [MIN, MAX] to the offset range.  For known objects (with
    zero-based offsets) at least one of whose offset's bounds is in range,
    constrain the other (or both) to the bounds of the object (i.e., zero
@@ -493,6 +509,8 @@ void access_ref::add_offset (const offset_int &min, const offset_int &max)
       if (max >= 0)
    {
      offrng[0] = 0;
+	  if (offmax[0] > 0)
+	    offmax[0] = 0;
      return;
    }
@@ -509,6 +527,12 @@ void access_ref::add_offset (const offset_int &min, const offset_int &max)
    offrng[0] = 0;
     }
+  /* Set the minimum and maximmum computed so far. */
+  if (offrng[1] < 0 && offrng[1] < offmax[0])
+    offmax[0] = offrng[1];
+  if (offrng[0] > 0 && offrng[0] > offmax[1])
+    offmax[1] = offrng[0];
+
   if (!base0)
     return;
@@ -4571,23 +4595,46 @@ access_ref::inform_access (access_mode mode) const
       return;
     }
+  if (mode == access_read_only)
+    {
+      if (allocfn == NULL_TREE)
+	{
+	  if (*offstr)
+	    inform (loc, "at offset %s into source object %qE of size %s",
+		    offstr, ref, sizestr);
+	  else
+	    inform (loc, "source object %qE of size %s", ref, sizestr);
+
+	  return;
+	}
+
+      if (*offstr)
+	inform (loc,
+		"at offset %s into source object of size %s allocated by %qE",
+		offstr, sizestr, allocfn);
+      else
+	inform (loc, "source object of size %s allocated by %qE",
+		sizestr, allocfn);
+      return;
+    }
+
   if (allocfn == NULL_TREE)
     {
       if (*offstr)
-	inform (loc, "at offset %s into source object %qE of size %s",
+	inform (loc, "at offset %s into object %qE of size %s",
    	offstr, ref, sizestr);
       else
-	inform (loc, "source object %qE of size %s", ref, sizestr);
+	inform (loc, "object %qE of size %s", ref, sizestr);
return;
     }
if (*offstr)
     inform (loc,
-	    "at offset %s into source object of size %s allocated by %qE",
+	    "at offset %s into object of size %s allocated by %qE",
        offstr, sizestr, allocfn);
   else
-    inform (loc, "source object of size %s allocated by %qE",
+    inform (loc, "object of size %s allocated by %qE",
        sizestr, allocfn);
 }
@@ -5433,16 +5480,16 @@ handle_mem_ref (tree mref, int ostype, access_ref *pref,
if (VECTOR_TYPE_P (TREE_TYPE (mref)))
     {
-      /* Hack: Give up for MEM_REFs of vector types; those may be
-	 synthesized from multiple assignments to consecutive data
-	 members (see PR 93200 and 96963).
+      /* Hack: Handle MEM_REFs of vector types as those to complete
+	 objects; those may be synthesized from multiple assignments
+	 to consecutive data members (see PR 93200 and 96963).
     FIXME: Vectorized assignments should only be present after
     vectorization so this hack is only necessary after it has
     run and could be avoided in calls from prior passes (e.g.,
     tree-ssa-strlen.c).
     FIXME: Deal with this more generally, e.g., by marking up
     such MEM_REFs at the time they're created.  */
-      return false;
+      ostype = 0;
     }
tree mrefop = TREE_OPERAND (mref, 0);
@@ -5796,6 +5843,12 @@ compute_objsize_r (tree ptr, int ostype, access_ref *pref,
tree rhs = gimple_assign_rhs1 (stmt);
+      if (code == ASSERT_EXPR)
+	{
+	  rhs = TREE_OPERAND (rhs, 0);
+	  return compute_objsize_r (rhs, ostype, pref, snlim, qry);
+	}
+
       if (code == POINTER_PLUS_EXPR
      && TREE_CODE (TREE_TYPE (rhs)) == POINTER_TYPE)
    {
diff --git a/gcc/builtins.h b/gcc/builtins.h
index e71f40c300a..a64ece3f1cd 100644
--- a/gcc/builtins.h
+++ b/gcc/builtins.h
@@ -222,6 +222,9 @@ struct access_ref
      argument to the minimum.  */
   offset_int size_remaining (offset_int * = NULL) const;
+/* Return true if the offset and object size are in range for SIZE.  */
+  bool offset_in_range (const offset_int &) const;
+
   /* Return true if *THIS is an access to a declared object.  */
   bool ref_declared () const
   {
@@ -261,6 +264,8 @@ struct access_ref
   /* Range of byte offsets into and sizes of the object(s).  */
   offset_int offrng[2];
   offset_int sizrng[2];
+  /* The minimum and maximum offset computed.  */
+  offset_int offmax[2];
   /* Range of the bound of the access: denotes that the access
      is at least BNDRNG[0] bytes but no more than BNDRNG[1].
      For string functions the size of the actual access is
diff --git a/gcc/gimple-array-bounds.cc b/gcc/gimple-array-bounds.cc
index 13f08685f8f..83b8db9755e 100644
--- a/gcc/gimple-array-bounds.cc
+++ b/gcc/gimple-array-bounds.cc
@@ -414,269 +414,72 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref,
   if (warning_suppressed_p (ref, OPT_Warray_bounds))
     return false;
-  tree arg = TREE_OPERAND (ref, 0);
-  /* The constant and variable offset of the reference.  */
-  tree cstoff = TREE_OPERAND (ref, 1);
-  tree varoff = NULL_TREE;
-
-  const offset_int maxobjsize = tree_to_shwi (max_object_size ());
-
-  /* The zero-based array or string constant bounds in bytes.  Initially
-     set to [-MAXOBJSIZE - 1, MAXOBJSIZE]  until a tighter bound is
-     determined.  */
-  offset_int arrbounds[2] = { -maxobjsize - 1, maxobjsize };
-
-  /* The minimum and maximum intermediate offset.  For a reference
-     to be valid, not only does the final offset/subscript must be
-     in bounds but all intermediate offsets should be as well.
-     GCC may be able to deal gracefully with such out-of-bounds
-     offsets so the checking is only enabled at -Warray-bounds=2
-     where it may help detect bugs in uses of the intermediate
-     offsets that could otherwise not be detectable.  */
-  offset_int ioff = wi::to_offset (fold_convert (ptrdiff_type_node, cstoff));
-  offset_int extrema[2] = { 0, wi::abs (ioff) };
-
-  /* The range of the byte offset into the reference.  */
-  offset_int offrange[2] = { 0, 0 };
-
   /* The statement used to allocate the array or null.  */
   gimple *alloc_stmt = NULL;
   /* For an allocation statement, the low bound of the size range.  */
   offset_int minbound = 0;
+  /* The type and size of the access.  */
+  tree axstype = TREE_TYPE (ref);
+  offset_int axssize = 0;
+  if (TREE_CODE (axstype) != UNION_TYPE)
+    if (tree access_size = TYPE_SIZE_UNIT (axstype))
+      if (TREE_CODE (access_size) == INTEGER_CST)
+	axssize = wi::to_offset (access_size);
-  /* Determine the offsets and increment OFFRANGE for the bounds of each.
-     The loop computes the range of the final offset for expressions such
-     as (A + i0 + ... + iN)[CSTOFF] where i0 through iN are SSA_NAMEs in
-     some range.  */
-  const unsigned limit = param_ssa_name_def_chain_limit;
-  for (unsigned n = 0; TREE_CODE (arg) == SSA_NAME && n < limit; ++n)
-    {
-      gimple *def = SSA_NAME_DEF_STMT (arg);
-      if (is_gimple_call (def))
-	{
-	  /* Determine the byte size of the array from an allocation call.  */
-	  wide_int sizrng[2];
-	  if (gimple_call_alloc_size (def, sizrng))
-	    {
-	      arrbounds[0] = 0;
-	      arrbounds[1] = offset_int::from (sizrng[1], UNSIGNED);
-	      minbound = offset_int::from (sizrng[0], UNSIGNED);
-	      alloc_stmt = def;
-	    }
-	  break;
-	}
-
-      if (gimple_nop_p (def))
-	{
-	  /* For a function argument try to determine the byte size
-	     of the array from the current function declaratation
-	     (e.g., attribute access or related).  */
-	  wide_int wr[2];
-	  tree ref = gimple_parm_array_size (arg, wr);
-	  if (!ref)
-	    break;
-	  arrbounds[0] = offset_int::from (wr[0], UNSIGNED);
-	  arrbounds[1] = offset_int::from (wr[1], UNSIGNED);
-	  arg = ref;
-	  break;
-	}
-
-      if (!is_gimple_assign (def))
-	break;
-
-      tree_code code = gimple_assign_rhs_code (def);
-      if (code == POINTER_PLUS_EXPR)
-	{
-	  arg = gimple_assign_rhs1 (def);
-	  varoff = gimple_assign_rhs2 (def);
-	}
-      else if (code == ASSERT_EXPR)
-	{
-	  arg = TREE_OPERAND (gimple_assign_rhs1 (def), 0);
-	  continue;
-	}
-      else
-	return false;
-
-      /* VAROFF should always be a SSA_NAME here (and not even
-	 INTEGER_CST) but there's no point in taking chances.  */
-      if (TREE_CODE (varoff) != SSA_NAME)
-	break;
-
-      const value_range* const vr = get_value_range (varoff);
-      if (!vr || vr->undefined_p () || vr->varying_p ())
-	break;
-
-      if (!vr->constant_p ())
-	break;
-
-      if (vr->kind () == VR_RANGE)
-	{
-	  offset_int min
-	    = wi::to_offset (fold_convert (ptrdiff_type_node, vr->min ()));
-	  offset_int max
-	    = wi::to_offset (fold_convert (ptrdiff_type_node, vr->max ()));
-	  if (min < max)
-	    {
-	      offrange[0] += min;
-	      offrange[1] += max;
-	    }
-	  else
-	    {
-	      /* When MIN >= MAX, the offset is effectively in a union
-		 of two ranges: [-MAXOBJSIZE -1, MAX] and [MIN, MAXOBJSIZE].
-		 Since there is no way to represent such a range across
-		 additions, conservatively add [-MAXOBJSIZE -1, MAXOBJSIZE]
-		 to OFFRANGE.  */
-	      offrange[0] += arrbounds[0];
-	      offrange[1] += arrbounds[1];
-	    }
-	}
-      else
-	{
-	  /* For an anti-range, analogously to the above, conservatively
-	     add [-MAXOBJSIZE -1, MAXOBJSIZE] to OFFRANGE.  */
-	  offrange[0] += arrbounds[0];
-	  offrange[1] += arrbounds[1];
-	}
-
-      /* Keep track of the minimum and maximum offset.  */
-      if (offrange[1] < 0 && offrange[1] < extrema[0])
-	extrema[0] = offrange[1];
-      if (offrange[0] > 0 && offrange[0] > extrema[1])
-	extrema[1] = offrange[0];
-
-      if (offrange[0] < arrbounds[0])
-	offrange[0] = arrbounds[0];
-
-      if (offrange[1] > arrbounds[1])
-	offrange[1] = arrbounds[1];
-    }
+  access_ref aref;
+  if (!compute_objsize (ref, 1, &aref, ranges))
+    return false;
-  tree reftype = NULL_TREE;
-  offset_int eltsize = -1;
-  if (arrbounds[0] >= 0)
-    {
-      /* The byte size of the array has already been determined above
-	 based on a pointer ARG.  Set ELTSIZE to the size of the type
-	 it points to and REFTYPE to the array with the size, rounded
-	 down as necessary.  */
-      reftype = TREE_TYPE (TREE_TYPE (arg));
-      if (TREE_CODE (reftype) == ARRAY_TYPE)
-	reftype = TREE_TYPE (reftype);
-      if (tree refsize = TYPE_SIZE_UNIT (reftype))
-	if (TREE_CODE (refsize) == INTEGER_CST)
-	  eltsize = wi::to_offset (refsize);
-
-      if (eltsize < 0)
-	return false;
+  if (aref.offset_in_range (axssize))
+    return false;
-      offset_int nelts = arrbounds[1] / eltsize;
-      reftype = build_printable_array_type (reftype, nelts.to_uhwi ());
-    }
-  else if (TREE_CODE (arg) == ADDR_EXPR)
+  if (TREE_CODE (aref.ref) == SSA_NAME)
     {
-      arg = TREE_OPERAND (arg, 0);
-      if (TREE_CODE (arg) != STRING_CST
-	  && TREE_CODE (arg) != PARM_DECL
-	  && TREE_CODE (arg) != VAR_DECL)
-	return false;
-
-      /* The type of the object being referred to.  It can be an array,
-	 string literal, or a non-array type when the MEM_REF represents
-	 a reference/subscript via a pointer to an object that is not
-	 an element of an array.  Incomplete types are excluded as well
-	 because their size is not known.  */
-      reftype = TREE_TYPE (arg);
-      if (POINTER_TYPE_P (reftype)
-	  || !COMPLETE_TYPE_P (reftype)
-	  || TREE_CODE (TYPE_SIZE_UNIT (reftype)) != INTEGER_CST)
-	return false;
-
-      /* Except in declared objects, references to trailing array members
-	 of structs and union objects are excluded because MEM_REF doesn't
-	 make it possible to identify the member where the reference
-	 originated.  */
-      if (RECORD_OR_UNION_TYPE_P (reftype)
-	  && (!VAR_P (arg)
-	      || (DECL_EXTERNAL (arg) && array_at_struct_end_p (ref))))
-	return false;
-
-      /* FIXME: Should this be 1 for Fortran?  */
-      arrbounds[0] = 0;
-
-      if (TREE_CODE (reftype) == ARRAY_TYPE)
-	{
-	  /* Set to the size of the array element (and adjust below).  */
-	  eltsize = wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (reftype)));
-	  /* Use log2 of size to convert the array byte size in to its
-	     upper bound in elements.  */
-	  const offset_int eltsizelog2 = wi::floor_log2 (eltsize);
-	  if (tree dom = TYPE_DOMAIN (reftype))
-	    {
-	      tree bnds[] = { TYPE_MIN_VALUE (dom), TYPE_MAX_VALUE (dom) };
-	      if (TREE_CODE (arg) == COMPONENT_REF)
-		{
-		  offset_int size = maxobjsize;
-		  if (tree fldsize = component_ref_size (arg))
-		    size = wi::to_offset (fldsize);
-		  arrbounds[1] = wi::lrshift (size, eltsizelog2);
-		}
-	      else if (array_at_struct_end_p (arg) || !bnds[0] || !bnds[1])
-		arrbounds[1] = wi::lrshift (maxobjsize, eltsizelog2);
-	      else
-		arrbounds[1] = (wi::to_offset (bnds[1]) - wi::to_offset (bnds[0])
-				+ 1) * eltsize;
-	    }
-	  else
-	    arrbounds[1] = wi::lrshift (maxobjsize, eltsizelog2);
-
-	  /* Determine a tighter bound of the non-array element type.  */
-	  tree eltype = TREE_TYPE (reftype);
-	  while (TREE_CODE (eltype) == ARRAY_TYPE)
-	    eltype = TREE_TYPE (eltype);
-	  eltsize = wi::to_offset (TYPE_SIZE_UNIT (eltype));
-	}
-      else
+      gimple *def = SSA_NAME_DEF_STMT (aref.ref);
+      if (is_gimple_call (def))
    {
-	  eltsize = 1;
-	  tree size = TYPE_SIZE_UNIT (reftype);
-	  if (VAR_P (arg))
-	    if (tree initsize = DECL_SIZE_UNIT (arg))
-	      if (tree_int_cst_lt (size, initsize))
-		size = initsize;
-
-	  arrbounds[1] = wi::to_offset (size);
+	  /* Save the allocation call and the low bound on the size.  */
+	  alloc_stmt = def;
+	  minbound = aref.sizrng[0];
    }
     }
-  else
-    return false;
-
-  offrange[0] += ioff;
-  offrange[1] += ioff;
+			
+  /* The range of the byte offset into the reference.  Adjusted below.  */
+  offset_int offrange[2] = { aref.offrng[0], aref.offrng[1] };
+
+  /* The type of the referenced object.  */
+  tree reftype = TREE_TYPE (aref.ref);
+  /* The size of the referenced array element.  */
+  offset_int eltsize = 1;
+  /* The byte size of the array has already been determined above
+     based on a pointer ARG.  Set ELTSIZE to the size of the type
+     it points to and REFTYPE to the array with the size, rounded
+     down as necessary.  */
+  if (POINTER_TYPE_P (reftype))
+    reftype = TREE_TYPE (reftype);
+  if (TREE_CODE (reftype) == ARRAY_TYPE)
+    reftype = TREE_TYPE (reftype);
+  if (tree refsize = TYPE_SIZE_UNIT (reftype))
+    if (TREE_CODE (refsize) == INTEGER_CST)
+      eltsize = wi::to_offset (refsize);
+
+  const offset_int nelts = aref.sizrng[1] / eltsize;
+  reftype = build_printable_array_type (reftype, nelts.to_uhwi ());
/* Compute the more permissive upper bound when IGNORE_OFF_BY_ONE
      is set (when taking the address of the one-past-last element
      of an array) but always use the stricter bound in diagnostics. */
-  offset_int ubound = arrbounds[1];
+  offset_int ubound = aref.sizrng[1];
   if (ignore_off_by_one)
     ubound += eltsize;
-  bool warned = false;
   /* Set if the lower bound of the subscript is out of bounds.  */
-  const bool lboob = (arrbounds[0] == arrbounds[1]
+  const bool lboob = (aref.sizrng[1] == 0
    	      || offrange[0] >= ubound
-		      || offrange[1] < arrbounds[0]);
+		      || offrange[1] < 0);
   /* Set if only the upper bound of the subscript is out of bounds.
      This can happen when using a bigger type to index into an array
      of a smaller type, as is common with unsigned char.  */
-  tree axstype = TREE_TYPE (ref);
-  offset_int axssize = 0;
-  if (TREE_CODE (axstype) != UNION_TYPE)
-    if (tree access_size = TYPE_SIZE_UNIT (axstype))
-      if (TREE_CODE (access_size) == INTEGER_CST)
-	axssize = wi::to_offset (access_size);
-
   const bool uboob = !lboob && offrange[0] + axssize > ubound;
   if (lboob || uboob)
     {
@@ -689,9 +492,7 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref,
     to compute the index to print in the diagnostic; arrays
     in MEM_REF don't mean anything.  A type with no size like
     void is as good as having a size of 1.  */
-      tree type = TREE_TYPE (ref);
-      while (TREE_CODE (type) == ARRAY_TYPE)
-	type = TREE_TYPE (type);
+      tree type = strip_array_types (TREE_TYPE (ref));
       if (tree size = TYPE_SIZE_UNIT (type))
    {
      offrange[0] = offrange[0] / wi::to_offset (size);
@@ -699,6 +500,7 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref,
    }
     }
+  bool warned = false;
   if (lboob)
     {
       if (offrange[0] == offrange[1])
@@ -720,7 +522,7 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref,
    /* If the memory was dynamically allocated refer to it as if
       it were an untyped array of bytes.  */
    backtype = build_array_type_nelts (unsigned_char_type_node,
-					   arrbounds[1].to_uhwi ());
+					   aref.sizrng[1].to_uhwi ());
warned = warning_at (location, OPT_Warray_bounds,
    		   "array subscript %<%T[%wi]%> is partly "
@@ -730,46 +532,8 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref,
if (warned)
     {
-      if (DECL_P (arg))
-	inform (DECL_SOURCE_LOCATION (arg), "while referencing %qD", arg);
-      else if (alloc_stmt)
-	{
-	  location_t loc = gimple_location (alloc_stmt);
-	  if (gimple_call_builtin_p (alloc_stmt, BUILT_IN_ALLOCA_WITH_ALIGN))
-	    {
-	      if (minbound == arrbounds[1])
-		inform (loc, "referencing a variable length array "
-			"of size %wu", minbound.to_uhwi ());
-	      else
-		inform (loc, "referencing a variable length array "
-			"of size between %wu and %wu",
-			minbound.to_uhwi (), arrbounds[1].to_uhwi ());
-	    }
-	  else if (tree fndecl = gimple_call_fndecl (alloc_stmt))
-	    {
-	      if (minbound == arrbounds[1])
-		inform (loc, "referencing an object of size %wu "
-			"allocated by %qD",
-			minbound.to_uhwi (), fndecl);
-	      else
-		inform (loc, "referencing an object of size between "
-			"%wu and %wu allocated by %qD",
-			minbound.to_uhwi (), arrbounds[1].to_uhwi (), fndecl);
-	    }
-	  else
-	    {
-	      tree fntype = gimple_call_fntype (alloc_stmt);
-	      if (minbound == arrbounds[1])
-		inform (loc, "referencing an object of size %wu "
-			"allocated by %qT",
-			minbound.to_uhwi (), fntype);
-	      else
-		inform (loc, "referencing an object of size between "
-			"%wu and %wu allocated by %qT",
-			minbound.to_uhwi (), arrbounds[1].to_uhwi (), fntype);
-	    }
-	}
-
+      /* TODO: Determine the access from the statement and use it.  */
+      aref.inform_access (access_none);
       suppress_warning (ref, OPT_Warray_bounds);
       return true;
     }
@@ -779,9 +543,9 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref,
/* At level 2 check also intermediate offsets.  */
   int i = 0;
-  if (extrema[i] < -arrbounds[1] || extrema[i = 1] > ubound)
+  if (aref.offmax[i] < -aref.sizrng[1] || aref.offmax[i = 1] > ubound)
     {
-      HOST_WIDE_INT tmpidx = extrema[i].to_shwi () / eltsize.to_shwi ();
+      HOST_WIDE_INT tmpidx = aref.offmax[i].to_shwi () / eltsize.to_shwi ();
if (warning_at (location, OPT_Warray_bounds,
    	      "intermediate array offset %wi is outside array bounds "
diff --git a/gcc/testsuite/c-c++-common/Warray-bounds-10.c b/gcc/testsuite/c-c++-common/Warray-bounds-10.c
new file mode 100644
index 00000000000..cfe9a383410
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/Warray-bounds-10.c
@@ -0,0 +1,114 @@
+/* PR tree-optimization/99475 - bogus -Warray-bounds accessing an array
+   element of empty structs
+   { dg-do compile }
+   { dg-options "-O2 -Wall" } */
+
+struct S
+{
+#if SOME_CONFIG_MACRO
+  /* Suppose the contents are empty in the development configuration
+     but non-empty in others.  Out of bounds accesses to elements of
+     the arrays below should be diagnosed in all configurations,
+     including when S is empty, even if they are folded away.  */
+  int member;
+#endif
+};
+
+extern struct S sa3[3];
+extern struct S sa2_3[2][3];
+extern struct S sa3_4_5[3][4][5];
+
+void sink (void*);
+
+
+void access_sa3 (struct S s)
+{
+  sa3[0] = s;
+  sa3[1] = s;
+  sa3[2] = s;
+  sa3[3] = s;       // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+}
+
+void access_sa3_ptr (struct S s)
+{
+  struct S *p = &sa3[0];
+
+  p[0] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[1] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[2] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[3] = s;         // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+}
+
+void access_sa2_3_ptr (struct S s)
+{
+  struct S *p = &sa2_3[0][0];
+
+  p[0] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[1] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[2] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[6] = s;         // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+}
+
+void access_sa3_4_5_ptr (struct S s, int i)
+{
+  struct S *p = &sa3_4_5[0][0][0];
+
+  p[0] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[1] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[2] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[60] = s;        // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+}
+
+
+void access_vla3 (struct S s, unsigned n)
+{
+  struct S vla3[3 < n ? 3 : n];
+
+  vla3[0] = s;
+  vla3[1] = s;
+  vla3[2] = s;
+  vla3[3] = s;       // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+
+  sink (vla3);
+}
+
+void access_vla3_ptr (struct S s, unsigned n)
+{
+  struct S vla3[3 < n ? 3 : n];
+  struct S *p = &vla3[0];
+
+  p[0] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[1] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[2] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[3] = s;         // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+
+  sink (vla3);
+}
+
+void access_vla2_3_ptr (struct S s, unsigned n)
+{
+  struct S vla2_3[2 < n ? 2 : n][3 < n ? 3 : n];
+  struct S *p = &vla2_3[0][0];
+
+  p[0] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[1] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[2] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[6] = s;         // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+
+  sink (vla2_3);
+}
+
+void access_vla3_4_5_ptr (struct S s, unsigned n)
+{
+  struct S vla3_4_5[3 < n ? 3 : n][4 < n ? 4 : n][5 < n ? 5 : n];
+  struct S *p = &vla3_4_5[0][0][0];
+
+  p[0] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[1] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[2] = s;         // { dg-bogus "\[-Warray-bounds" }
+  p[60] = s;        // { dg-warning "\[-Warray-bounds" "pr?????" { xfail *-*-* } }
+
+  sink (vla3_4_5);
+}
+
+// { dg-prune-output "empty struct has size 0 in C" }
diff --git a/gcc/testsuite/c-c++-common/Warray-bounds-3.c b/gcc/testsuite/c-c++-common/Warray-bounds-3.c
index aae4999ea13..3d7c7687374 100644
--- a/gcc/testsuite/c-c++-common/Warray-bounds-3.c
+++ b/gcc/testsuite/c-c++-common/Warray-bounds-3.c
@@ -158,7 +158,7 @@ void test_memcpy_overflow (char *d, const char *s, size_t n)
      but known access size is detected.  This works except with small
      sizes that are powers of 2 due to bug .  */
   T (char, 1, arr + SR (DIFF_MAX - 1, DIFF_MAX), s, 1);
-  T (char, 1, arr + SR (DIFF_MAX - 1, DIFF_MAX), s, 2);  /* { dg-warning "pointer overflow between offset \[[0-9]+, [0-9]+] and size 2 accessing array " "bug " { xfail non_strict_align } } */
+  T (char, 1, arr + SR (DIFF_MAX - 1, DIFF_MAX), s, 2);  /* { dg-warning "\[-Warray-bounds" } */
   T (char, 1, arr + SR (DIFF_MAX - 2, DIFF_MAX), s, 3);  /* { dg-warning "pointer overflow between offset \[[0-9]+, [0-9]+] and size 3 accessing array " "memcpy" } */
   T (char, 1, arr + SR (DIFF_MAX - 4, DIFF_MAX), s, 5);  /* { dg-warning "pointer overflow between offset \[[0-9]+, [0-9]+] and size 5 accessing array " "memcpy" } */
 }
@@ -178,7 +178,7 @@ void test_memcpy_bounds_memarray_range (void)
TM (ma.a5, ma.a5 + i, ma.a5, 1);
   TM (ma.a5, ma.a5 + i, ma.a5, 3);
-  TM (ma.a5, ma.a5 + i, ma.a5, 5);
+  TM (ma.a5, ma.a5 + i, ma.a5, 5);     /* { dg-warning "\[-Warray-bounds" } */
   TM (ma.a5, ma.a5 + i, ma.a5, 7);     /* diagnosed with -Warray-bounds=2 */
 }
diff --git a/gcc/testsuite/c-c++-common/Warray-bounds-4.c b/gcc/testsuite/c-c++-common/Warray-bounds-4.c
index 22a23a12651..1f73f11943f 100644
--- a/gcc/testsuite/c-c++-common/Warray-bounds-4.c
+++ b/gcc/testsuite/c-c++-common/Warray-bounds-4.c
@@ -43,7 +43,17 @@ void test_memcpy_bounds_memarray_range (void)
TM (ma.a5, ma.a5 + j, ma.a5, 1);
   TM (ma.a5, ma.a5 + j, ma.a5, 3);
-  TM (ma.a5, ma.a5 + j, ma.a5, 5);
+
+  /* The copy below is invalid for two reasons: 1) it overlaps and 2) it
+     writes past the end of ma.a5.  The warning is a little cryptic here
+     because the GIMPLE is:
+       _4 = &ma.a5 + prephitmp_14;
+       MEM <unsigned char[5]> [(char * {ref-all})_4]
+         = MEM <unsigned char[5]> [(char * {ref-all})&ma];
+     and could be improved.  Just verify that one is issued but not its
+     full text.  */
+  TM (ma.a5, ma.a5 + j, ma.a5, 5);        /* { dg-warning "\[-Warray-bounds" } */
+
   TM (ma.a5, ma.a5 + j, ma.a5, 7);        /* { dg-warning "offset \[5, 7] from the object at .ma. is out of the bounds of referenced subobject .(MA::)?a5. with type .char ?\[5]. at offset 0" } */
   TM (ma.a5, ma.a5 + j, ma.a5, 9);        /* { dg-warning "offset \[5, 9] from the object at .ma. is out of the bounds of referenced subobject .(MA::)?a5. with type .char ?\[5]. at offset 0" } */
 }
diff --git a/gcc/testsuite/c-c++-common/Warray-bounds-9.c b/gcc/testsuite/c-c++-common/Warray-bounds-9.c
new file mode 100644
index 00000000000..be05775fa91
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/Warray-bounds-9.c
@@ -0,0 +1,144 @@
+/* PR tree-optimization/99121 - ICE in -Warray-bounds on a multidimensional
+   VLA
+   { dg-do compile }
+   { dg-options "-O2 -Wall -ftrack-macro-expansion=0" } */
+
+#define NOIPA __attribute__ ((noipa))
+
+void sink (void*, ...);
+#define T(a, x) sink (a, x)
+
+
+NOIPA void a_0_n (int n)
+{
+  int a[0][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_n_0 (int n)
+{
+  int a[n][0];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+
+NOIPA void a_1_n_0 (int n)
+{
+  int a[1][n][0];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_1_0_n (int n)
+{
+  int a[1][0][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_0_1_n (int n)
+{
+  int a[0][1][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_0_n_1 (int n)
+{
+  int a[0][n][1];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_n_0_n (int n)
+{
+  int a[n][0][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_n_n_0 (int n)
+{
+  int a[n][n][0];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_0_n_n (int n)
+{
+  int a[0][n][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_0_0_n (int n)
+{
+  int a[0][0][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_n_0_0 (int n)
+{
+  int a[n][0][0];
+
+  sink (a);
+
+  T (a, ((int *) a)[0]);      // { dg-warning "\[-Warray-bounds" }
+  T (a, ((char *) a)[1]);     // { dg-warning "\[-Warray-bounds" }
+  T (a, ((float *) a)[n]);    // { dg-warning "\[-Warray-bounds" }
+}
+
+NOIPA void a_n_n_n (int n)
+{
+  int a[n][n][n];
+
+  sink (a);
+
+  T (a, ((int *) a)[-1]);     // { dg-warning "\[-Warray-bounds" "pr99140" }
+  T (a, ((int *) a)[0]);
+  T (a, ((char *) a)[1]);
+  T (a, ((float *) a)[n]);
+}
diff --git a/gcc/testsuite/g++.dg/asan/asan_test.C b/gcc/testsuite/g++.dg/asan/asan_test.C
index c62568f48ec..49933ab8e4d 100644
--- a/gcc/testsuite/g++.dg/asan/asan_test.C
+++ b/gcc/testsuite/g++.dg/asan/asan_test.C
@@ -2,7 +2,7 @@
 // { dg-skip-if "" { *-*-* } { "*" } { "-O2" } }
 // { dg-skip-if "" { *-*-* } { "-flto" } { "" } }
 // { dg-additional-sources "asan_globals_test-wrapper.cc" }
-// { dg-options "-std=c++11 -fsanitize=address -fno-builtin -Wall -Werror -Wno-alloc-size-larger-than -Wno-stringop-overflow -g -DASAN_UAR=0 -DASAN_HAS_EXCEPTIONS=1 -DASAN_HAS_BLACKLIST=0 -DSANITIZER_USE_DEJAGNU_GTEST=1 -lasan -lpthread" }
+// { dg-options "-std=c++11 -fsanitize=address -fno-builtin -Wall -Werror -Wno-alloc-size-larger-than -Wno-array-bounds -Wno-stringop-overflow -g -DASAN_UAR=0 -DASAN_HAS_EXCEPTIONS=1 -DASAN_HAS_BLACKLIST=0 -DSANITIZER_USE_DEJAGNU_GTEST=1 -lasan -lpthread" }
 // { dg-additional-options "-ldl" { target { ! *-*-freebsd* } } }
 // { dg-additional-options "-DASAN_NEEDS_SEGV=1" { target { ! arm*-*-* } } }
 // { dg-additional-options "-DASAN_LOW_MEMORY=1 -DASAN_NEEDS_SEGV=0" { target arm*-*-* } }
diff --git a/gcc/testsuite/g++.dg/pr95768.C b/gcc/testsuite/g++.dg/pr95768.C
index 5e2c8c44ad0..d34d5133134 100644
--- a/gcc/testsuite/g++.dg/pr95768.C
+++ b/gcc/testsuite/g++.dg/pr95768.C
@@ -1,6 +1,6 @@
 /* PR c++/95768 - pretty-printer ICE on -Wuninitialized with allocated storage
    { dg-do compile }
-   { dg-options "-O2 -Wall" } */
+   { dg-options "-O2 -Wall -Wno-array-bounds" } */
</cut>

    

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[CI-NOTIFY]: TCWG Bisect tcwg_gnu/gnu-master-arm-bootstrap_debug - Build # 13 - Successful!