diff options
Diffstat (limited to 'gcc/cselib.c')
| -rw-r--r-- | gcc/cselib.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/cselib.c b/gcc/cselib.c index 8e9b3edefb0..626ba47a840 100644 --- a/gcc/cselib.c +++ b/gcc/cselib.c @@ -42,6 +42,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "params.h" #include "alloc-pool.h" +static bool cselib_record_memory; static int entry_and_rtx_equal_p (const void *, const void *); static hashval_t get_value_hash (const void *); static struct elt_list *new_elt_list (struct elt_list *, cselib_val *); @@ -748,6 +749,7 @@ cselib_lookup_mem (rtx x, int create) struct elt_list *l; if (MEM_VOLATILE_P (x) || mode == BLKmode + || !cselib_record_memory || (FLOAT_MODE_P (mode) && flag_float_store)) return 0; @@ -1201,7 +1203,8 @@ cselib_record_set (rtx dest, cselib_val *src_elt, cselib_val *dest_addr_elt) n_useless_values--; src_elt->locs = new_elt_loc_list (src_elt->locs, dest); } - else if (GET_CODE (dest) == MEM && dest_addr_elt != 0) + else if (GET_CODE (dest) == MEM && dest_addr_elt != 0 + && cselib_record_memory) { if (src_elt->locs == 0) n_useless_values--; @@ -1275,7 +1278,8 @@ cselib_record_sets (rtx insn) sets[i].dest = dest = XEXP (dest, 0); /* We don't know how to record anything but REG or MEM. */ - if (GET_CODE (dest) == REG || GET_CODE (dest) == MEM) + if (GET_CODE (dest) == REG + || (GET_CODE (dest) == MEM && cselib_record_memory)) { rtx src = sets[i].src; if (cond) @@ -1320,7 +1324,8 @@ cselib_record_sets (rtx insn) for (i = 0; i < n_sets; i++) { rtx dest = sets[i].dest; - if (GET_CODE (dest) == REG || GET_CODE (dest) == MEM) + if (GET_CODE (dest) == REG + || (GET_CODE (dest) == MEM && cselib_record_memory)) cselib_record_set (dest, sets[i].src_elt, sets[i].dest_addr_elt); } } @@ -1394,12 +1399,16 @@ cselib_process_insn (rtx insn) remove_useless_values (); } +static int initialized; /* Initialize cselib for one pass. The caller must also call init_alias_analysis. */ void -cselib_init (void) +cselib_init (bool record_memory) { + if (initialized) + abort (); + initialized = 1; elt_list_pool = create_alloc_pool ("elt_list", sizeof (struct elt_list), 10); elt_loc_list_pool = create_alloc_pool ("elt_loc_list", @@ -1408,6 +1417,7 @@ cselib_init (void) sizeof (cselib_val), 10); value_pool = create_alloc_pool ("value", RTX_SIZE (VALUE), 100); + cselib_record_memory = record_memory; /* This is only created once. */ if (! callmem) callmem = gen_rtx_MEM (BLKmode, const0_rtx); @@ -1437,13 +1447,15 @@ cselib_init (void) void cselib_finish (void) { + if (!initialized) + abort (); + initialized = 0; free_alloc_pool (elt_list_pool); free_alloc_pool (elt_loc_list_pool); free_alloc_pool (cselib_val_pool); free_alloc_pool (value_pool); clear_table (); htab_delete (hash_table); - reg_values = 0; free (used_regs); used_regs = 0; hash_table = 0; |