diff options
Diffstat (limited to 'gcc/tree-ssa-phiopt.c')
| -rw-r--r-- | gcc/tree-ssa-phiopt.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c index d197bdd..e5ff683 100644 --- a/gcc/tree-ssa-phiopt.c +++ b/gcc/tree-ssa-phiopt.c @@ -311,14 +311,26 @@ tree_ssa_phiopt_worker (bool do_store_elim) else { gimple_seq phis = phi_nodes (bb2); + gimple_stmt_iterator gsi; - /* Check to make sure that there is only one PHI node. + /* Check to make sure that there is only one non-virtual PHI node. TODO: we could do it with more than one iff the other PHI nodes have the same elements for these two edges. */ - if (! gimple_seq_singleton_p (phis)) + phi = NULL; + for (gsi = gsi_start (phis); !gsi_end_p (gsi); gsi_next (&gsi)) + { + if (!is_gimple_reg (gimple_phi_result (gsi_stmt (gsi)))) + continue; + if (phi) + { + phi = NULL; + break; + } + phi = gsi_stmt (gsi); + } + if (!phi) continue; - phi = gsi_stmt (gsi_start (phis)); arg0 = gimple_phi_arg_def (phi, e1->dest_idx); arg1 = gimple_phi_arg_def (phi, e2->dest_idx); |