diff options
Diffstat (limited to 'gcc/gimple-ssa-strength-reduction.c')
| -rw-r--r-- | gcc/gimple-ssa-strength-reduction.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/gimple-ssa-strength-reduction.c b/gcc/gimple-ssa-strength-reduction.c index 8471812b8f1..f5148ea858b 100644 --- a/gcc/gimple-ssa-strength-reduction.c +++ b/gcc/gimple-ssa-strength-reduction.c @@ -437,7 +437,10 @@ static struct pointer_map_t *alt_base_map; /* Given BASE, use the tree affine combiniation facilities to find the underlying tree expression for BASE, with any - immediate offset excluded. */ + immediate offset excluded. + + N.B. we should eliminate this backtracking with better forward + analysis in a future release. */ static tree get_alternative_base (tree base) @@ -565,7 +568,7 @@ find_basis_for_candidate (slsr_cand_t c) } } - if (!basis && c->kind == CAND_REF) + if (flag_expensive_optimizations && !basis && c->kind == CAND_REF) { tree alt_base_expr = get_alternative_base (c->base_expr); if (alt_base_expr) @@ -650,7 +653,7 @@ alloc_cand_and_find_basis (enum cand_kind kind, gimple gs, tree base, c->basis = find_basis_for_candidate (c); record_potential_basis (c, base); - if (kind == CAND_REF) + if (flag_expensive_optimizations && kind == CAND_REF) { tree alt_base = get_alternative_base (base); if (alt_base) |