diff options
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 20 |
1 files changed, 18 insertions, 2 deletions
@@ -213,6 +213,9 @@ static int num_mem_sets; A pseudo has valid regscan info if its number is < max_reg_before_loop. */ int max_reg_before_loop; +/* The value to pass to the next call of reg_scan_update. */ +static int loop_max_reg; + /* This obstack is used in product_cheap_p to allocate its rtl. It may call gen_reg_rtx which, in turn, may reallocate regno_reg_rtx. If we used the same obstack that it did, we would be deallocating @@ -467,6 +470,7 @@ loop_optimize (f, dumpfile, unroll_p, bct_p) init_recog_no_volatile (); max_reg_before_loop = max_reg_num (); + loop_max_reg = max_reg_before_loop; regs_may_share = 0; @@ -516,7 +520,7 @@ loop_optimize (f, dumpfile, unroll_p, bct_p) /* Now find all register lifetimes. This must be done after find_and_verify_loops, because it might reorder the insns in the function. */ - reg_scan (f, max_reg_num (), 1); + reg_scan (f, max_reg_before_loop, 1); /* This must occur after reg_scan so that registers created by gcse will have entries in the register tables. @@ -660,7 +664,7 @@ scan_loop (loop_start, end, loop_cont, unroll_p, bct_p) int insn_count; int in_libcall = 0; int tem; - rtx temp; + rtx temp, update_start, update_end; /* The SET from an insn, if it is the only SET in the insn. */ rtx set, set1; /* Chain describing insns movable in current loop. */ @@ -1178,12 +1182,24 @@ scan_loop (loop_start, end, loop_cont, unroll_p, bct_p) load_mems_and_recount_loop_regs_set (scan_start, end, loop_top, loop_start, &insn_count); + for (update_start = loop_start; + PREV_INSN (update_start) && GET_CODE (PREV_INSN (update_start)) != CODE_LABEL; + update_start = PREV_INSN (update_start)) + ; + update_end = NEXT_INSN (end); + + reg_scan_update (update_start, update_end, loop_max_reg); + loop_max_reg = max_reg_num (); + if (flag_strength_reduce) { the_movables = movables; strength_reduce (scan_start, end, loop_top, insn_count, loop_start, end, loop_info, loop_cont, unroll_p, bct_p); + + reg_scan_update (update_start, update_end, loop_max_reg); + loop_max_reg = max_reg_num (); } VARRAY_FREE (reg_single_usage); |