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PR tree-optimization/83781 - Bootstrap failed on x86 with --with-arch=corei7 

PR tree-optimization/83781 - Bootstrap failed on x86 with --with-arch=corei7
  --with-cpu=corei7

gcc/ChangeLog:
	* gimple-fold.c (get_range_strlen): Avoid treating arrays of pointers
	as string arrays.

gcc/testsuite/ChangeLog:
	* gcc.dg/strlenopt-42.c: New test.

From-SVN: r256477
This commit is contained in:
Martin Sebor 2018-01-11 05:13:57 +00:00 committed by Martin Sebor
parent 05ef31736c
commit 1bfd6a0038
4 changed files with 40 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-01-10 Martin Sebor <msebor@redhat.com>
PR tree-optimization/83781
* gimple-fold.c (get_range_strlen): Avoid treating arrays of pointers
as string arrays.
2018-01-11 Martin Sebor <msebor@gmail.com>
Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>

7
gcc/gimple-fold.c
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@ -1360,10 +1360,17 @@ get_range_strlen (tree arg, tree length[2], bitmap *visited, int type,
{
tree type = TREE_TYPE (TREE_OPERAND (arg, 0));
/* Determine the "innermost" array type. */
while (TREE_CODE (type) == ARRAY_TYPE
&& TREE_CODE (TREE_TYPE (type)) == ARRAY_TYPE)
type = TREE_TYPE (type);
/* Avoid arrays of pointers. */
tree eltype = TREE_TYPE (type);
if (TREE_CODE (type) != ARRAY_TYPE
|| !INTEGRAL_TYPE_P (eltype))
return false;
val = TYPE_SIZE_UNIT (type);
if (!val || integer_zerop (val))
return false;

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2018-01-10 Martin Sebor <msebor@redhat.com>
PR tree-optimization/83781
* gcc.dg/strlenopt-42.c: New test.
2018-01-11 Martin Sebor <msebor@gmail.com>
Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>

22
gcc/testsuite/gcc.dg/strlenopt-42.c Normal file
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@ -0,0 +1,22 @@
/* PR tree-optimization/83781 - Bootstrap failed on x86 with --with-arch=corei7
--with-cpu=corei7
Verify that the upper bound of the size of an array of pointers
to strings isn't considered to be the upper bound of the lengths
of the pointed-to strings.
{ dg-do compile }
{ dg-options "-O2 -Wall" } */
const char* const ap[32] = { "1", "12", "123" };
char d4[4];
char d7[7];
void nowarn_range_ptr_var_1 (int i)
{
__builtin_sprintf (d4, "%s", ap[i]);
}
void nowarn_range_ptr_var_2 (int i, int j)
{
__builtin_sprintf (d7, "%s%s", ap[i], ap[j]);
}