diff options
| author | Andrew MacLeod <amacleod@redhat.com> | 2022-10-31 09:53:01 -0400 |
|---|---|---|
| committer | Andrew MacLeod <amacleod@redhat.com> | 2022-11-01 09:05:20 -0400 |
| commit | 7cc2824e39440dd71a9d2832c51ef260bb36d8ca (patch) | |
| tree | 6c1a9b0a734572cd27197b842d85dafc6a883249 /gcc | |
| parent | 81f98afa22815e7397714caf6fa0fc815803ebaa (diff) | |
| download | gcc-7cc2824e39440dd71a9d2832c51ef260bb36d8ca.zip gcc-7cc2824e39440dd71a9d2832c51ef260bb36d8ca.tar.gz gcc-7cc2824e39440dd71a9d2832c51ef260bb36d8ca.tar.bz2 | |
Intersect with nonzero bits can indicate change incorrectly.
* value-range.cc (irange::intersect_nonzero_bits): If new
non-zero mask is the same as original, flag no change.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/value-range.cc | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/value-range.cc b/gcc/value-range.cc index 03b3c4b..3743ec7 100644 --- a/gcc/value-range.cc +++ b/gcc/value-range.cc @@ -3017,6 +3017,10 @@ irange::intersect_nonzero_bits (const irange &r) if (mask_to_wi (m_nonzero_mask, t) != mask_to_wi (r.m_nonzero_mask, t)) { wide_int nz = get_nonzero_bits () & r.get_nonzero_bits (); + // If the nonzero bits did not change, return false. + if (nz == get_nonzero_bits ()) + return false; + m_nonzero_mask = wide_int_to_tree (t, nz); if (set_range_from_nonzero_bits ()) return true; |