diff options
| author | Richard Biener <rguenther@suse.de> | 2021-11-23 10:11:41 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-11-23 11:04:34 +0100 |
| commit | 6cd440670078af89d82cbb67e01a5ecec8eec238 (patch) | |
| tree | f9fdb1da2189db498f22bc8f21bd3bcbe1375bf6 /gcc/gimple-loop-jam.c | |
| parent | 2780484bc376a89edb0c97b6b85209f4c27f34ee (diff) | |
| download | gcc-6cd440670078af89d82cbb67e01a5ecec8eec238.zip gcc-6cd440670078af89d82cbb67e01a5ecec8eec238.tar.gz gcc-6cd440670078af89d82cbb67e01a5ecec8eec238.tar.bz2 | |
tree-optimization/103361 - fix unroll-and-jam direction vector handling
This properly uses lambda_int instead of truncating the direction
vector to int which leads to false unexpected negative values.
2021-11-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/103361
* gimple-loop-jam.c (adjust_unroll_factor): Use lambda_int
for the dependence distance.
* tree-data-ref.c (print_lambda_vector): Properly print a lambda_int.
* g++.dg/torture/pr103361.C: New testcase.
Diffstat (limited to 'gcc/gimple-loop-jam.c')
| -rw-r--r-- | gcc/gimple-loop-jam.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/gimple-loop-jam.c b/gcc/gimple-loop-jam.c index 666f740..933a4e0 100644 --- a/gcc/gimple-loop-jam.c +++ b/gcc/gimple-loop-jam.c @@ -402,10 +402,10 @@ adjust_unroll_factor (class loop *inner, struct data_dependence_relation *ddr, a >= N, or b > 0, or b is zero and a > 0. Otherwise the unroll factor needs to be limited so that the first condition holds. That may limit the factor down to zero in the worst case. */ - int dist = dist_v[0]; + lambda_int dist = dist_v[0]; if (dist < 0) gcc_unreachable (); - else if ((unsigned)dist >= *unroll) + else if (dist >= (lambda_int)*unroll) ; else if (lambda_vector_zerop (dist_v + 1, DDR_NB_LOOPS (ddr) - 1)) { |