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tree-optimization/106189 - avoid division by zero exception

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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.
This commit is contained in:
Richard Biener 2022-07-25 17:24:57 +02:00
parent 16fc26d4e7
commit bb04f9f23a
2 changed files with 6 additions and 1 deletions
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2
gcc/gimple-array-bounds.cc
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@ -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 "

5
gcc/testsuite/gcc.dg/pr106189.c Normal file
View File

@ -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]); }