diff options
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index 2436c057e83..c99e4de7337 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -1,5 +1,5 @@ /* Common subexpression elimination for GNU compiler. - Copyright (C) 1987, 88, 89, 92-6, 1997 Free Software Foundation, Inc. + Copyright (C) 1987, 88, 89, 92-7, 1998 Free Software Foundation, Inc. This file is part of GNU CC. @@ -193,6 +193,11 @@ Related expressions: static int max_reg; +/* One plus largest instruction UID used in this function at time of + cse_main call. */ + +static int max_insn_uid; + /* Length of vectors indexed by quantity number. We know in advance we will not need a quantity number this big. */ @@ -7942,10 +7947,16 @@ cse_around_loop (loop_start) The only thing we do with SET_DEST is invalidate entries, so we can safely process each SET in order. It is slightly less efficient - to do so, but we only want to handle the most common cases. */ + to do so, but we only want to handle the most common cases. + + The gen_move_insn call in cse_set_around_loop may create new pseudos. + These pseudos won't have valid entries in any of the tables indexed + by register number, such as reg_qty. We avoid out-of-range array + accesses by not processing any instructions created after cse started. */ for (insn = NEXT_INSN (loop_start); GET_CODE (insn) != CALL_INSN && GET_CODE (insn) != CODE_LABEL + && INSN_UID (insn) < max_insn_uid && ! (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END); insn = NEXT_INSN (insn)) @@ -8402,6 +8413,8 @@ cse_main (f, nregs, after_loop, file) max_reg = nregs; + max_insn_uid = get_max_uid (); + all_minus_one = (int *) alloca (nregs * sizeof (int)); consec_ints = (int *) alloca (nregs * sizeof (int)); |