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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2018-03-02 09:45:51 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2018-03-02 09:45:51 +0000 |
| commit | 962e91fcf043edab3684dd0564efd3df219d3cb1 (patch) | |
| tree | 97607f1a40e2c04231fbc034f22260989fd38c8f | |
| parent | ec2d71214f90e21675a5abbe5b532273f7b11ded (diff) | |
| download | gcc-962e91fcf043edab3684dd0564efd3df219d3cb1.zip gcc-962e91fcf043edab3684dd0564efd3df219d3cb1.tar.gz gcc-962e91fcf043edab3684dd0564efd3df219d3cb1.tar.bz2 | |
Use loop->safelen rather than loop->force_vectorize
...since the latter doesn't guarantee independence by itself.
2018-03-02 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
* tree-vect-data-refs.c (vect_analyze_data_ref_dependence)
(vect_analyze_data_ref_access): Use loop->safe_len rather than
loop->force_vectorize to check whether there is no alias.
gcc/testsuite/
* gcc.dg/vect/vect-alias-check-13.c: New test.
From-SVN: r258130
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/vect/vect-alias-check-13.c | 21 | ||||
| -rw-r--r-- | gcc/tree-vect-data-refs.c | 4 |
4 files changed, 33 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 09cae39..affd19a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2018-03-02 Richard Sandiford <richard.sandiford@linaro.org> + + * tree-vect-data-refs.c (vect_analyze_data_ref_dependence) + (vect_analyze_data_ref_access): Use loop->safe_len rather than + loop->force_vectorize to check whether there is no alias. + 2018-03-02 Jakub Jelinek <jakub@redhat.com> PR target/84614 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index cb19be5..e15927c 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2018-03-02 Richard Sandiford <richard.sandiford@linaro.org> + + * gcc.dg/vect/vect-alias-check-13.c: New test. + 2018-03-02 Jakub Jelinek <jakub@redhat.com> PR target/84614 diff --git a/gcc/testsuite/gcc.dg/vect/vect-alias-check-13.c b/gcc/testsuite/gcc.dg/vect/vect-alias-check-13.c new file mode 100644 index 0000000..60bc473 --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/vect-alias-check-13.c @@ -0,0 +1,21 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target vect_int } */ + +void +f1 (int *x, long step1, int n) +{ + for (int i = 0; i < n; ++i) + x[i * step1] += 1; +} + +void +f2 (int *x, long step2, int n) +{ +#pragma GCC ivdep + for (int i = 0; i < n; ++i) + x[i * step2] += 2; +} + +/* { dg-final { scan-tree-dump {need run-time check that [^\n]*step1[^\n]* is nonzero} "vect" } } */ +/* { dg-final { scan-tree-dump-not {need run-time check that [^\n]*step2[^\n]* is nonzero} "vect" } } */ +/* { dg-final { scan-tree-dump-times {LOOP VECTORIZED} 2 "vect" } } */ diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c index 01f7138..c009498 100644 --- a/gcc/tree-vect-data-refs.c +++ b/gcc/tree-vect-data-refs.c @@ -466,7 +466,7 @@ vect_analyze_data_ref_dependence (struct data_dependence_relation *ddr, return true; } - if (!loop->force_vectorize) + if (loop->safelen < 2) { tree indicator = dr_zero_step_indicator (dra); if (TREE_CODE (indicator) != INTEGER_CST) @@ -2720,7 +2720,7 @@ vect_analyze_data_ref_access (struct data_reference *dr) /* Allow references with zero step for outer loops marked with pragma omp simd only - it guarantees absence of loop-carried dependencies between inner loop iterations. */ - if (!loop->force_vectorize) + if (loop->safelen < 2) { if (dump_enabled_p ()) dump_printf_loc (MSG_NOTE, vect_location, |