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| author | Andrew MacLeod <amacleod@redhat.com> | 2022-01-10 13:33:44 -0500 |
|---|---|---|
| committer | Andrew MacLeod <amacleod@redhat.com> | 2022-01-11 09:21:12 -0500 |
| commit | 71b72132011a47a4b39950d95718f18d1218978c (patch) | |
| tree | 4aba44f3eb45991a4c9a255e32babd12ac8e0cc0 | |
| parent | 4f34f8cc1d064bfaaed723312c71e92f495d429b (diff) | |
| download | gcc-71b72132011a47a4b39950d95718f18d1218978c.zip gcc-71b72132011a47a4b39950d95718f18d1218978c.tar.gz gcc-71b72132011a47a4b39950d95718f18d1218978c.tar.bz2 | |
Prevent exponential range calculations.
Produce a summary result for any operation involving too many subranges.
PR tree-optimization/103821
* range-op.cc (range_operator::fold_range): Only do precise ranges
when there are not too many subranges.
| -rw-r--r-- | gcc/range-op.cc | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/range-op.cc b/gcc/range-op.cc index 1af42eb..a4f6e9e 100644 --- a/gcc/range-op.cc +++ b/gcc/range-op.cc @@ -209,10 +209,12 @@ range_operator::fold_range (irange &r, tree type, unsigned num_rh = rh.num_pairs (); // If both ranges are single pairs, fold directly into the result range. - if (num_lh == 1 && num_rh == 1) + // If the number of subranges grows too high, produce a summary result as the + // loop becomes exponential with little benefit. See PR 103821. + if ((num_lh == 1 && num_rh == 1) || num_lh * num_rh > 12) { - wi_fold_in_parts (r, type, lh.lower_bound (0), lh.upper_bound (0), - rh.lower_bound (0), rh.upper_bound (0)); + wi_fold_in_parts (r, type, lh.lower_bound (), lh.upper_bound (), + rh.lower_bound (), rh.upper_bound ()); op1_op2_relation_effect (r, type, lh, rh, rel); return true; } |