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From: David Malcolm <dmalcolm@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r14-1496] analyzer: regions in different memory spaces can't alias Date: Fri, 2 Jun 2023 13:29:12 +0000 (GMT) [thread overview] Message-ID: <20230602132912.87E133858D32@sourceware.org> (raw) https://gcc.gnu.org/g:b8a916726e7f4b8871ac9dd75b66d26d1adf4798 commit r14-1496-gb8a916726e7f4b8871ac9dd75b66d26d1adf4798 Author: David Malcolm <dmalcolm@redhat.com> Date: Fri Jun 2 09:28:30 2023 -0400 analyzer: regions in different memory spaces can't alias gcc/analyzer/ChangeLog: * store.cc (store::eval_alias_1): Regions in different memory spaces can't alias. Signed-off-by: David Malcolm <dmalcolm@redhat.com> Diff: --- gcc/analyzer/store.cc | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/gcc/analyzer/store.cc b/gcc/analyzer/store.cc index e8c927b9fe9..4d1de825e79 100644 --- a/gcc/analyzer/store.cc +++ b/gcc/analyzer/store.cc @@ -2710,6 +2710,18 @@ tristate store::eval_alias_1 (const region *base_reg_a, const region *base_reg_b) const { + /* If they're in different memory spaces, they can't alias. */ + { + enum memory_space memspace_a = base_reg_a->get_memory_space (); + if (memspace_a != MEMSPACE_UNKNOWN) + { + enum memory_space memspace_b = base_reg_b->get_memory_space (); + if (memspace_b != MEMSPACE_UNKNOWN + && memspace_a != memspace_b) + return tristate::TS_FALSE; + } + } + if (const symbolic_region *sym_reg_a = base_reg_a->dyn_cast_symbolic_region ()) {
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