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| author | Martin Liska <mliska@suse.cz> | 2022-10-08 10:19:23 +0200 |
|---|---|---|
| committer | Martin Liska <mliska@suse.cz> | 2022-10-08 10:19:23 +0200 |
| commit | d9e7934d25da4a78ffef1f738206aa1d897911df (patch) | |
| tree | 1bd1697c14259e095f4b4790946eae7df0c5a2e3 /gcc/gimple-loop-jam.cc | |
| parent | da0970e441345f8349522ff1abac5c223044ebb1 (diff) | |
| parent | 6ffbf87ca66f4ed9cd79cff675fabe2109e46e85 (diff) | |
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Merge branch 'master' into devel/sphinx
Diffstat (limited to 'gcc/gimple-loop-jam.cc')
| -rw-r--r-- | gcc/gimple-loop-jam.cc | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/gcc/gimple-loop-jam.cc b/gcc/gimple-loop-jam.cc index a8a57d3..4f7a6e5 100644 --- a/gcc/gimple-loop-jam.cc +++ b/gcc/gimple-loop-jam.cc @@ -545,11 +545,25 @@ tree_loop_unroll_and_jam (void) /* If the refs are independend there's nothing to do. */ if (DDR_ARE_DEPENDENT (ddr) == chrec_known) continue; + dra = DDR_A (ddr); drb = DDR_B (ddr); - /* Nothing interesting for the self dependencies. */ + + /* Nothing interesting for the self dependencies, except for WAW if + the access function is not affine or constant because we may end + up reordering writes to the same location. */ if (dra == drb) - continue; + { + if (DR_IS_WRITE (dra) + && !DR_ACCESS_FNS (dra).is_empty () + && DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) + { + unroll_factor = 0; + break; + } + else + continue; + } /* Now check the distance vector, for determining a sensible outer unroll factor, and for validity of merging the inner |