diff options
Diffstat (limited to 'gcc/toplev.c')
| -rw-r--r-- | gcc/toplev.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gcc/toplev.c b/gcc/toplev.c index 7b49110d925..840632a0315 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -239,6 +239,7 @@ enum dump_file_index DFI_bp, DFI_ce1, DFI_tracer, + DFI_loop2, DFI_cse2, DFI_life, DFI_combine, @@ -289,6 +290,7 @@ static struct dump_file_info dump_file[DFI_MAX] = { "bp", 'b', 1, 0, 0 }, { "ce1", 'C', 1, 0, 0 }, { "tracer", 'T', 1, 0, 0 }, + { "loop2", 'L', 1, 0, 0 }, { "cse2", 't', 1, 0, 0 }, { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */ { "combine", 'c', 1, 0, 0 }, @@ -519,6 +521,9 @@ int flag_unroll_loops; int flag_unroll_all_loops; +/* Nonzero enables loop unswitching. */ +int flag_unswitch_loops; + /* Nonzero enables prefetch optimizations for arrays in loops. */ int flag_prefetch_loop_arrays; @@ -997,6 +1002,8 @@ static const lang_independent_options f_options[] = N_("Perform loop unrolling when iteration count is known") }, {"unroll-all-loops", &flag_unroll_all_loops, 1, N_("Perform loop unrolling for all loops") }, + {"unswitch-loops", &flag_unswitch_loops, 1, + N_("Perform loop unswitching") }, {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1, N_("Generate prefetch instructions, if available, for arrays in loops") }, {"move-all-movables", &flag_move_all_movables, 1, @@ -3057,6 +3064,38 @@ rest_of_compilation (decl) timevar_pop (TV_TRACER); } + /* Perform loop optimalizations. It might be better to do them a bit + sooner, but we want the profile feedback to work more efficiently. */ + if (optimize > 0 + && flag_unswitch_loops) + { + struct loops *loops; + timevar_push (TV_LOOP); + open_dump_file (DFI_loop2, decl); + if (rtl_dump_file) + dump_flow_info (rtl_dump_file); + + loops = loop_optimizer_init (rtl_dump_file); + + if (loops) + { + /* The optimalizations: */ + if (flag_unswitch_loops) + unswitch_loops (loops); + + loop_optimizer_finalize (loops, rtl_dump_file); + } + + cleanup_cfg (CLEANUP_EXPENSIVE); + delete_trivially_dead_insns (insns, max_reg_num ()); + reg_scan (insns, max_reg_num (), 0); + if (rtl_dump_file) + dump_flow_info (rtl_dump_file); + close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ()); + timevar_pop (TV_LOOP); + ggc_collect (); + } + if (flag_rerun_cse_after_loop) { timevar_push (TV_CSE2); @@ -4884,6 +4923,7 @@ parse_options_and_default_flags (argc, argv) { flag_inline_functions = 1; flag_rename_registers = 1; + flag_unswitch_loops = 1; } if (optimize < 2 || optimize_size) |