diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/gcc.target/i386/pr95866-1.c | 2 | ||||
| -rw-r--r-- | gcc/tree-vect-slp.c | 22 |
2 files changed, 23 insertions, 1 deletions
diff --git a/gcc/testsuite/gcc.target/i386/pr95866-1.c b/gcc/testsuite/gcc.target/i386/pr95866-1.c index 991370c..553d415 100644 --- a/gcc/testsuite/gcc.target/i386/pr95866-1.c +++ b/gcc/testsuite/gcc.target/i386/pr95866-1.c @@ -13,6 +13,6 @@ void foo(int i) /* We should not use vector operations for i + 1 and (i + 1) & 31 but instead use { j, j, j, j }. */ -/* { dg-final { scan-tree-dump-times "Building parent vector operands from scalars" 2 "slp2" } } */ +/* { dg-final { scan-tree-dump-times "Using a splat of the uniform operand" 2 "slp2" } } */ /* { dg-final { scan-tree-dump-not " = \{i_" "slp2" } } */ /* { dg-final { scan-tree-dump-times " = \{j_" 1 "slp2" } } */ diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c index 894f045..85865da 100644 --- a/gcc/tree-vect-slp.c +++ b/gcc/tree-vect-slp.c @@ -1486,6 +1486,28 @@ vect_build_slp_tree_2 (vec_info *vinfo, continue; } + if (is_a <bb_vec_info> (vinfo) + && oprnd_info->first_dt == vect_internal_def) + { + /* For BB vectorization, if all defs are the same do not + bother to continue the build along the single-lane + graph but use a splat of the scalar value. */ + stmt_vec_info first_def = oprnd_info->def_stmts[0]; + for (j = 1; j < group_size; ++j) + if (oprnd_info->def_stmts[j] != first_def) + break; + if (j == group_size + /* But avoid doing this for loads where we may be + able to CSE things. */ + && !gimple_vuse (first_def->stmt)) + { + if (dump_enabled_p ()) + dump_printf_loc (MSG_NOTE, vect_location, + "Using a splat of the uniform operand\n"); + oprnd_info->first_dt = vect_external_def; + } + } + if (oprnd_info->first_dt != vect_internal_def && oprnd_info->first_dt != vect_reduction_def && oprnd_info->first_dt != vect_induction_def) |