diff options
| author | Richard Biener <rguenther@suse.de> | 2022-07-25 17:24:57 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2022-07-27 11:23:45 +0200 |
| commit | 5b8458bc35b5df34c1b4b8735975f2686444f6c8 (patch) | |
| tree | 09faa5d7652bb7187be1f7067cdbe541a3c73097 | |
| parent | d2892faac6d760ebc47f8f6ebee51e5cf6255cc8 (diff) | |
tree-optimization/106189 - avoid division by zero exception
The diagnostic code can end up with zero sized array elements
with T[][0] and the wide-int code nicely avoids exceptions when
dividing by zero in one codepath but not in another. The following
fixes the exception by using wide-int in both paths.
PR tree-optimization/106189
* gimple-array-bounds.cc (array_bounds_checker::check_mem_ref):
Divide using offset_ints.
* gcc.dg/pr106189.c: New testcase.
(cherry picked from commit bb04f9f23ac0dee2c003118c85372ece50a52220)
| -rw-r--r-- | gcc/gimple-array-bounds.cc | 2 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr106189.c | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/gcc/gimple-array-bounds.cc b/gcc/gimple-array-bounds.cc index 7ec8b08c8d2..9e46811a675 100644 --- a/gcc/gimple-array-bounds.cc +++ b/gcc/gimple-array-bounds.cc @@ -534,7 +534,7 @@ array_bounds_checker::check_mem_ref (location_t location, tree ref, int i = 0; if (aref.offmax[i] < -aref.sizrng[1] || aref.offmax[i = 1] > ubound) { - HOST_WIDE_INT tmpidx = aref.offmax[i].to_shwi () / eltsize.to_shwi (); + HOST_WIDE_INT tmpidx = (aref.offmax[i] / eltsize).to_shwi (); if (warning_at (location, OPT_Warray_bounds, "intermediate array offset %wi is outside array bounds " diff --git a/gcc/testsuite/gcc.dg/pr106189.c b/gcc/testsuite/gcc.dg/pr106189.c new file mode 100644 index 00000000000..0eca8343c56 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr106189.c @@ -0,0 +1,5 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -Warray-bounds=2 -w" } */ + +int a_n_0_0_a[][0]; +void a_n_0_0() { T(((char *)a_n_0_0_a)[1]); } |