diff options
Diffstat (limited to 'gcc/tree-vect-loop.c')
| -rw-r--r-- | gcc/tree-vect-loop.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c index 200ed27..f1f16e3 100644 --- a/gcc/tree-vect-loop.c +++ b/gcc/tree-vect-loop.c @@ -7777,8 +7777,12 @@ vectorizable_phi (vec_info *, "incompatible vector types for invariants\n"); return false; } - record_stmt_cost (cost_vec, SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node), - vector_stmt, stmt_info, vectype, 0, vect_body); + /* For single-argument PHIs assume coalescing which means zero cost + for the scalar and the vector PHIs. This avoids artificially + favoring the vector path (but may pessimize it in some cases). */ + if (gimple_phi_num_args (as_a <gphi *> (stmt_info->stmt)) > 1) + record_stmt_cost (cost_vec, SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node), + vector_stmt, stmt_info, vectype, 0, vect_body); STMT_VINFO_TYPE (stmt_info) = phi_info_type; return true; } |