17df585a3a
Restrict negative offset computation only to dynamic object sizes, where size expressions are accurate and not a maximum/minimum estimate and in cases where negative offsets definitely mean an underflow, e.g. in MEM_REF of the whole object with negative ofset in addr_object_size. This ends up missing some cases where __builtin_object_size could have come up with more precise results, so tests have been adjusted to reflect that. gcc/ChangeLog: PR tree-optimization/104009 * tree-object-size.c (compute_builtin_object_size): Bail out on negative offset. (plus_stmt_object_size): Return maximum of wholesize and minimum of 0 for negative offset. gcc/testsuite/ChangeLog: PR tree-optimization/104009 * gcc.dg/builtin-object-size-1.c (test10): New test. * gcc.dg/builtin-object-size-3.c (test10): Likewise. (test9): Expect zero size for negative offsets. * gcc.dg/builtin-object-size-4.c (test8): Likewise. * gcc.dg/builtin-object-size-5.c (test7): Drop test for __builtin_object_size. Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org> |
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| c++tools | ||
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
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| libgfortran | ||
| libgo | ||
| libgomp | ||
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| libphobos | ||
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