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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2018-01-02 18:27:24 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2018-01-02 18:27:24 +0000 |
| commit | d3867483044ae00bac6daaeac6274e95254fb991 (patch) | |
| tree | f88513d11adda2c227b64b6e7453d3b2d8b40afc /gcc/tree-vect-generic.c | |
| parent | 1a1c441dbe5933ebf9180831236aa5be7d70a434 (diff) | |
| download | gcc-d3867483044ae00bac6daaeac6274e95254fb991.zip gcc-d3867483044ae00bac6daaeac6274e95254fb991.tar.gz gcc-d3867483044ae00bac6daaeac6274e95254fb991.tar.bz2 | |
Use vec_perm_builder::series_p in shift_amt_for_vec_perm_mask
This patch makes shift_amt_for_vec_perm_mask use series_p to check
for the simple case of a natural linear series before falling back
to testing each element individually. The series_p test works with
variable-length vectors but testing every individual element doesn't.
2018-01-02 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
* optabs.c (shift_amt_for_vec_perm_mask): Try using series_p
before testing each element individually.
* tree-vect-generic.c (lower_vec_perm): Likewise.
From-SVN: r256099
Diffstat (limited to 'gcc/tree-vect-generic.c')
| -rw-r--r-- | gcc/tree-vect-generic.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/gcc/tree-vect-generic.c b/gcc/tree-vect-generic.c index 767721c..602cea3 100644 --- a/gcc/tree-vect-generic.c +++ b/gcc/tree-vect-generic.c @@ -1320,15 +1320,20 @@ lower_vec_perm (gimple_stmt_iterator *gsi) && indices[0] && indices[0] < elements) { - for (i = 1; i < elements; ++i) + bool ok_p = indices.series_p (0, 1, indices[0], 1); + if (!ok_p) { - unsigned int expected = i + indices[0]; - /* Indices into the second vector are all equivalent. */ - if (MIN (elements, (unsigned) indices[i]) - != MIN (elements, expected)) - break; + for (i = 1; i < elements; ++i) + { + unsigned int expected = i + indices[0]; + /* Indices into the second vector are all equivalent. */ + if (MIN (elements, (unsigned) indices[i]) + != MIN (elements, expected)) + break; + } + ok_p = i == elements; } - if (i == elements) + if (ok_p) { gimple_assign_set_rhs3 (stmt, mask); update_stmt (stmt); |