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| author | Jan Hubicka <hubicka@ucw.cz> | 2021-11-05 23:32:55 +0100 |
|---|---|---|
| committer | Jan Hubicka <hubicka@ucw.cz> | 2021-11-05 23:32:55 +0100 |
| commit | 5f37780372212a7245f0528e46dbeb741316bba1 (patch) | |
| tree | 5fb5c7c4dc616ff39d25cf005d0b752b46e854d2 | |
| parent | 9cc8ca8da90426f625481195a2127a5e86689bcd (diff) | |
| download | gcc-5f37780372212a7245f0528e46dbeb741316bba1.zip gcc-5f37780372212a7245f0528e46dbeb741316bba1.tar.gz gcc-5f37780372212a7245f0528e46dbeb741316bba1.tar.bz2 | |
Fix ice in insert_access
gcc/ChangeLog:
PR ipa/103073
* ipa-modref-tree.h (modref_tree::insert): Do nothing for
paradoxical and zero sized accesses.
gcc/testsuite/ChangeLog:
PR ipa/103073
* g++.dg/torture/pr103073.C: New test.
* gcc.dg/tree-ssa/modref-11.c: New test.
| -rw-r--r-- | gcc/ipa-modref-tree.h | 30 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/torture/pr103073.C | 8 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/modref-11.c | 13 |
3 files changed, 51 insertions, 0 deletions
diff --git a/gcc/ipa-modref-tree.h b/gcc/ipa-modref-tree.h index bc428d1..54ae9e1 100644 --- a/gcc/ipa-modref-tree.h +++ b/gcc/ipa-modref-tree.h @@ -818,6 +818,36 @@ struct GTY((user)) modref_tree bool changed = false; + /* We may end up with max_size being less than size for accesses past the + end of array. Those are undefined and safe to ignore. */ + if (a.range_info_useful_p () + && known_size_p (a.size) && known_size_p (a.max_size) + && known_lt (a.max_size, a.size)) + { + if (dump_file) + fprintf (dump_file, + " - Paradoxical range. Ignoring\n"); + return false; + } + if (known_size_p (a.size) + && known_eq (a.size, 0)) + { + if (dump_file) + fprintf (dump_file, + " - Zero size. Ignoring\n"); + return false; + } + if (known_size_p (a.max_size) + && known_eq (a.max_size, 0)) + { + if (dump_file) + fprintf (dump_file, + " - Zero max_size. Ignoring\n"); + return false; + } + gcc_checking_assert (!known_size_p (a.max_size) + || !known_le (a.max_size, 0)); + /* No useful information tracked; collapse everything. */ if (!base && !ref && !a.useful_p ()) { diff --git a/gcc/testsuite/g++.dg/torture/pr103073.C b/gcc/testsuite/g++.dg/torture/pr103073.C new file mode 100644 index 0000000..02b1eee --- /dev/null +++ b/gcc/testsuite/g++.dg/torture/pr103073.C @@ -0,0 +1,8 @@ +// { dg-do compile } +int a; +void b(bool c[], char d[], bool g[][55][21]) { + for (signed e = 0; e < 11; e += 3) + for (unsigned f = c[0] + 1; f < d[0]; f += 3) + a = g[0][e][f + 2]; +} + diff --git a/gcc/testsuite/gcc.dg/tree-ssa/modref-11.c b/gcc/testsuite/gcc.dg/tree-ssa/modref-11.c new file mode 100644 index 0000000..de9ad16 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/modref-11.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-modref1" } */ +struct linkedlist { + struct linkedlist *next; +}; +struct linkedlist * +find_last (struct linkedlist *l) +{ + while (l->next) + l = l->next; + return l; +} +/* { dg-final { scan-tree-dump "noclobber noescape nodirectescape" "modref1"} } */ |