diff options
Diffstat (limited to 'gcc/config/riscv/riscv-vsetvl.cc')
| -rw-r--r-- | gcc/config/riscv/riscv-vsetvl.cc | 48 |
1 files changed, 45 insertions, 3 deletions
diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc index 971c3f9..2d576e8 100644 --- a/gcc/config/riscv/riscv-vsetvl.cc +++ b/gcc/config/riscv/riscv-vsetvl.cc @@ -2003,9 +2003,51 @@ vector_insn_info::parse_insn (insn_info *insn) new_info.parse_insn (def_insn); if (!same_vlmax_p (new_info) && !scalar_move_insn_p (insn->rtl ())) return; - /* TODO: Currently, we don't forward AVL for non-VLMAX vsetvl. */ - if (vlmax_avl_p (new_info.get_avl ())) - set_avl_info (avl_info (new_info.get_avl (), get_avl_source ())); + + if (new_info.has_avl ()) + { + if (new_info.has_avl_imm ()) + set_avl_info (avl_info (new_info.get_avl (), nullptr)); + else + { + if (vlmax_avl_p (new_info.get_avl ())) + set_avl_info (avl_info (new_info.get_avl (), get_avl_source ())); + else + { + /* Conservatively propagate non-VLMAX AVL of user vsetvl: + 1. The user vsetvl should be same block with the rvv insn. + 2. The user vsetvl is the only def insn of rvv insn. + 3. The AVL is not modified between def-use chain. + 4. The VL is only used by insn within EBB. + */ + bool modified_p = false; + for (insn_info *i = def_insn->next_nondebug_insn (); + real_insn_and_same_bb_p (i, get_insn ()->bb ()); + i = i->next_nondebug_insn ()) + { + if (find_access (i->defs (), REGNO (new_info.get_avl ()))) + { + modified_p = true; + break; + } + } + + bool has_live_out_use = false; + for (use_info *use : m_avl.get_source ()->all_uses ()) + { + if (use->is_live_out_use ()) + { + has_live_out_use = true; + break; + } + } + if (!modified_p && !has_live_out_use + && def_insn == m_avl.get_source ()->insn () + && m_insn->bb () == def_insn->bb ()) + set_avl_info (new_info.get_avl_info ()); + } + } + } if (scalar_move_insn_p (insn->rtl ()) && m_avl.has_non_zero_avl ()) m_demands[DEMAND_NONZERO_AVL] = true; |