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none X-Spam-Score: 1.47 X-Spamd-Result: default: False [1.47 / 50.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-0.98)[-0.981]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; MISSING_MID(2.50)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_SPAM_SHORT(3.00)[0.999]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; BAYES_HAM(-2.95)[99.78%] X-Spam-Status: No, score=-10.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, MISSING_MID, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org Message-Id: <20240222144707.457C7385780D@sourceware.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791610823877560886 X-GMAIL-MSGID: 1791610823877560886 The following adds another omission to the assert verifying we're not running into spurious off == -1. Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed. PR tree-optimization/114048 * tree-ssa-sccvn.cc (copy_reference_ops_from_ref): MEM_REF can also produce -1 off. * gcc.dg/torture/pr114048.c: New testcase. --- gcc/testsuite/gcc.dg/torture/pr114048.c | 25 +++++++++++++++++++++++++ gcc/tree-ssa-sccvn.cc | 2 ++ 2 files changed, 27 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/torture/pr114048.c diff --git a/gcc/testsuite/gcc.dg/torture/pr114048.c b/gcc/testsuite/gcc.dg/torture/pr114048.c new file mode 100644 index 00000000000..338000b3006 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr114048.c @@ -0,0 +1,25 @@ +/* { dg-do compile } */ + +typedef struct { + void *child[2]; + char otherbits; +} critbit0_node; + +int allprefixed_traverse(char *top) +{ + if (top) + { + critbit0_node *q = (void *)top - 1; + int direction = 0; + for (;; ++direction) + switch (allprefixed_traverse(q->child[direction])) + { + case 1: + break; + case 0: + return 0; + default: + return 1; + } + } +} diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc index 3e93685e80a..2587eb1c505 100644 --- a/gcc/tree-ssa-sccvn.cc +++ b/gcc/tree-ssa-sccvn.cc @@ -1185,6 +1185,8 @@ copy_reference_ops_from_ref (tree ref, vec *result) else { gcc_assert (known_ne (op.off, -1) + /* The constant offset can be -1. */ + || op.opcode == MEM_REF /* Out-of-bound indices can compute to a known -1 offset. */ || ((op.opcode == ARRAY_REF