/* Common subexpression elimination library for GNU compiler.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
#include "insn-config.h"
#include "recog.h"
#include "function.h"
-#include "expr.h"
+#include "emit-rtl.h"
#include "toplev.h"
#include "output.h"
#include "ggc.h"
#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 *);
static void unchain_one_value (cselib_val *);
static void unchain_one_elt_list (struct elt_list **);
static void unchain_one_elt_loc_list (struct elt_loc_list **);
-static void clear_table (void);
static int discard_useless_locs (void **, void *);
static int discard_useless_values (void **, void *);
static void remove_useless_values (void);
static rtx wrap_constant (enum machine_mode, rtx);
-static unsigned int hash_rtx (rtx, enum machine_mode, int);
+static unsigned int cselib_hash_rtx (rtx, enum machine_mode, int);
static cselib_val *new_cselib_val (unsigned int, enum machine_mode);
static void add_mem_for_addr (cselib_val *, cselib_val *, rtx);
static cselib_val *cselib_lookup_mem (rtx, int);
static void cselib_invalidate_regno (unsigned int, enum machine_mode);
static void cselib_invalidate_mem (rtx);
-static void cselib_invalidate_rtx (rtx, rtx, void *);
static void cselib_record_set (rtx, cselib_val *, cselib_val *);
static void cselib_record_sets (rtx);
which the register was set; if the mode is unknown or the value is
no longer valid in that mode, ELT will be NULL for the first
element. */
-struct elt_list **reg_values;
-unsigned int reg_values_size;
+static struct elt_list **reg_values;
+static unsigned int reg_values_size;
#define REG_VALUES(i) reg_values[i]
/* The largest number of hard regs used by any entry added to the
- REG_VALUES table. Cleared on each clear_table() invocation. */
+ REG_VALUES table. Cleared on each cselib_clear_table() invocation. */
static unsigned int max_value_regs;
/* Here the set of indices I with REG_VALUES(I) != 0 is saved. This is used
- in clear_table() for fast emptying. */
+ in cselib_clear_table() for fast emptying. */
static unsigned int *used_regs;
static unsigned int n_used_regs;
el = pool_alloc (elt_loc_list_pool);
el->next = next;
el->loc = loc;
- el->canon_loc = NULL;
el->setting_insn = cselib_current_insn;
el->in_libcall = cselib_current_insn_in_libcall;
return el;
initialization. If CLEAR_ALL isn't set, then only clear the entries
which are known to have been used. */
-static void
-clear_table (void)
+void
+cselib_clear_table (void)
{
unsigned int i;
rtx x = (rtx) x_arg;
enum machine_mode mode = GET_MODE (x);
- if (GET_CODE (x) == CONST_INT
- || (mode == VOIDmode && GET_CODE (x) == CONST_DOUBLE))
- abort ();
+ gcc_assert (GET_CODE (x) != CONST_INT
+ && (mode != VOIDmode || GET_CODE (x) != CONST_DOUBLE));
+
if (mode != GET_MODE (v->u.val_rtx))
return 0;
}
/* The hash function for our hash table. The value is always computed with
- hash_rtx when adding an element; this function just extracts the hash
- value from a cselib_val structure. */
+ cselib_hash_rtx when adding an element; this function just extracts the
+ hash value from a cselib_val structure. */
static hashval_t
get_value_hash (const void *entry)
htab_traverse (hash_table, discard_useless_values, 0);
- if (n_useless_values != 0)
- abort ();
+ gcc_assert (!n_useless_values);
}
/* Return the mode in which a register was last set. If X is not a
enum machine_mode
cselib_reg_set_mode (rtx x)
{
- if (GET_CODE (x) != REG)
+ if (!REG_P (x))
return GET_MODE (x);
if (REG_VALUES (REGNO (x)) == NULL
const char *fmt;
int i;
- if (GET_CODE (x) == REG || GET_CODE (x) == MEM)
+ if (REG_P (x) || MEM_P (x))
{
cselib_val *e = cselib_lookup (x, GET_MODE (x), 0);
x = e->u.val_rtx;
}
- if (GET_CODE (y) == REG || GET_CODE (y) == MEM)
+ if (REG_P (y) || MEM_P (y))
{
cselib_val *e = cselib_lookup (y, GET_MODE (y), 0);
rtx t = l->loc;
/* Avoid infinite recursion. */
- if (GET_CODE (t) == REG || GET_CODE (t) == MEM)
+ if (REG_P (t) || MEM_P (t))
continue;
else if (rtx_equal_for_cselib_p (t, y))
return 1;
{
rtx t = l->loc;
- if (GET_CODE (t) == REG || GET_CODE (t) == MEM)
+ if (REG_P (t) || MEM_P (t))
continue;
else if (rtx_equal_for_cselib_p (x, t))
return 1;
contain anything but integers and other rtx's,
except for within LABEL_REFs and SYMBOL_REFs. */
default:
- abort ();
+ gcc_unreachable ();
}
}
return 1;
if (GET_CODE (x) != CONST_INT
&& (GET_CODE (x) != CONST_DOUBLE || GET_MODE (x) != VOIDmode))
return x;
- if (mode == VOIDmode)
- abort ();
+ gcc_assert (mode != VOIDmode);
return gen_rtx_CONST (mode, x);
}
otherwise the mode of X is used. */
static unsigned int
-hash_rtx (rtx x, enum machine_mode mode, int create)
+cselib_hash_rtx (rtx x, enum machine_mode mode, int create)
{
cselib_val *e;
int i, j;
for (i = 0; i < units; ++i)
{
elt = CONST_VECTOR_ELT (x, i);
- hash += hash_rtx (elt, GET_MODE (elt), 0);
+ hash += cselib_hash_rtx (elt, GET_MODE (elt), 0);
}
return hash;
fmt = GET_RTX_FORMAT (code);
for (; i >= 0; i--)
{
- if (fmt[i] == 'e')
+ switch (fmt[i])
{
- rtx tem = XEXP (x, i);
- unsigned int tem_hash = hash_rtx (tem, 0, create);
-
- if (tem_hash == 0)
- return 0;
-
- hash += tem_hash;
- }
- else if (fmt[i] == 'E')
- for (j = 0; j < XVECLEN (x, i); j++)
+ case 'e':
{
- unsigned int tem_hash = hash_rtx (XVECEXP (x, i, j), 0, create);
-
+ rtx tem = XEXP (x, i);
+ unsigned int tem_hash = cselib_hash_rtx (tem, 0, create);
+
if (tem_hash == 0)
return 0;
-
+
hash += tem_hash;
}
- else if (fmt[i] == 's')
- {
- const unsigned char *p = (const unsigned char *) XSTR (x, i);
+ break;
+ case 'E':
+ for (j = 0; j < XVECLEN (x, i); j++)
+ {
+ unsigned int tem_hash
+ = cselib_hash_rtx (XVECEXP (x, i, j), 0, create);
+
+ if (tem_hash == 0)
+ return 0;
+
+ hash += tem_hash;
+ }
+ break;
+
+ case 's':
+ {
+ const unsigned char *p = (const unsigned char *) XSTR (x, i);
+
+ if (p)
+ while (*p)
+ hash += *p++;
+ break;
+ }
+
+ case 'i':
+ hash += XINT (x, i);
+ break;
- if (p)
- while (*p)
- hash += *p++;
+ case '0':
+ case 't':
+ /* unused */
+ break;
+
+ default:
+ gcc_unreachable ();
}
- else if (fmt[i] == 'i')
- hash += XINT (x, i);
- else if (fmt[i] == '0' || fmt[i] == 't')
- /* unused */;
- else
- abort ();
}
return hash ? hash : 1 + (unsigned int) GET_CODE (x);
{
cselib_val *e = pool_alloc (cselib_val_pool);
-#ifdef ENABLE_CHECKING
- if (value == 0)
- abort ();
-#endif
+ gcc_assert (value);
e->value = value;
- /* We use custom method to allocate this RTL construct because it accounts
- about 8% of overall memory usage. */
+ /* We use an alloc pool to allocate this RTL construct because it
+ accounts for about 8% of the overall memory usage. We know
+ precisely when we can have VALUE RTXen (when cselib is active)
+ so we don't need to put them in garbage collected memory.
+ ??? Why should a VALUE be an RTX in the first place? */
e->u.val_rtx = pool_alloc (value_pool);
memset (e->u.val_rtx, 0, RTX_HDR_SIZE);
PUT_CODE (e->u.val_rtx, VALUE);
/* Avoid duplicates. */
for (l = mem_elt->locs; l; l = l->next)
- if (GET_CODE (l->loc) == MEM
+ if (MEM_P (l->loc)
&& CSELIB_VAL_PTR (XEXP (l->loc, 0)) == addr_elt)
return;
struct elt_list *l;
if (MEM_VOLATILE_P (x) || mode == BLKmode
+ || !cselib_record_memory
|| (FLOAT_MODE_P (mode) && flag_float_store))
return 0;
if (GET_MODE (l->elt->u.val_rtx) == GET_MODE (x))
return l->elt->u.val_rtx;
- abort ();
+ gcc_unreachable ();
case MEM:
e = cselib_lookup_mem (x, 0);
if (GET_CODE (x) == VALUE)
return CSELIB_VAL_PTR (x);
- if (GET_CODE (x) == REG)
+ if (REG_P (x))
{
struct elt_list *l;
unsigned int i = REGNO (x);
return e;
}
- if (GET_CODE (x) == MEM)
+ if (MEM_P (x))
return cselib_lookup_mem (x, create);
- hashval = hash_rtx (x, mode, create);
+ hashval = cselib_hash_rtx (x, mode, create);
/* Can't even create if hashing is not possible. */
if (! hashval)
return 0;
unsigned int i;
/* If we see pseudos after reload, something is _wrong_. */
- if (reload_completed && regno >= FIRST_PSEUDO_REGISTER
- && reg_renumber[regno] >= 0)
- abort ();
+ gcc_assert (!reload_completed || regno < FIRST_PSEUDO_REGISTER
+ || reg_renumber[regno] < 0);
/* Determine the range of registers that must be invalidated. For
pseudos, only REGNO is affected. For hard regs, we must take MODE
if they contain values that overlap REGNO. */
if (regno < FIRST_PSEUDO_REGISTER)
{
- if (mode == VOIDmode)
- abort ();
+ gcc_assert (mode != VOIDmode);
if (regno < max_value_regs)
i = 0;
{
rtx x = (*p)->loc;
- if (GET_CODE (x) == REG && REGNO (x) == i)
+ if (REG_P (x) && REGNO (x) == i)
{
unchain_one_elt_loc_list (p);
break;
while (*p)
{
rtx x = (*p)->loc;
- rtx canon_x = (*p)->canon_loc;
cselib_val *addr;
struct elt_list **mem_chain;
/* MEMs may occur in locations only at the top level; below
that every MEM or REG is substituted by its VALUE. */
- if (GET_CODE (x) != MEM)
+ if (!MEM_P (x))
{
p = &(*p)->next;
continue;
}
- if (!canon_x)
- canon_x = (*p)->canon_loc = canon_rtx (x);
if (num_mems < PARAM_VALUE (PARAM_MAX_CSELIB_MEMORY_LOCATIONS)
&& ! canon_true_dependence (mem_rtx, GET_MODE (mem_rtx), mem_addr,
x, cselib_rtx_varies_p))
*vp = &dummy_val;
}
-/* Invalidate DEST, which is being assigned to or clobbered. The second and
- the third parameter exist so that this function can be passed to
- note_stores; they are ignored. */
+/* Invalidate DEST, which is being assigned to or clobbered. */
-static void
-cselib_invalidate_rtx (rtx dest, rtx ignore ATTRIBUTE_UNUSED,
- void *data ATTRIBUTE_UNUSED)
+void
+cselib_invalidate_rtx (rtx dest)
{
- while (GET_CODE (dest) == STRICT_LOW_PART || GET_CODE (dest) == SIGN_EXTRACT
- || GET_CODE (dest) == ZERO_EXTRACT || GET_CODE (dest) == SUBREG)
+ while (GET_CODE (dest) == SUBREG
+ || GET_CODE (dest) == ZERO_EXTRACT
+ || GET_CODE (dest) == STRICT_LOW_PART)
dest = XEXP (dest, 0);
- if (GET_CODE (dest) == REG)
+ if (REG_P (dest))
cselib_invalidate_regno (REGNO (dest), GET_MODE (dest));
- else if (GET_CODE (dest) == MEM)
+ else if (MEM_P (dest))
cselib_invalidate_mem (dest);
/* Some machines don't define AUTO_INC_DEC, but they still use push
invalidate the stack pointer correctly. Note that invalidating
the stack pointer is different from invalidating DEST. */
if (push_operand (dest, GET_MODE (dest)))
- cselib_invalidate_rtx (stack_pointer_rtx, NULL_RTX, NULL);
+ cselib_invalidate_rtx (stack_pointer_rtx);
+}
+
+/* A wrapper for cselib_invalidate_rtx to be called via note_stores. */
+
+static void
+cselib_invalidate_rtx_note_stores (rtx dest, rtx ignore ATTRIBUTE_UNUSED,
+ void *data ATTRIBUTE_UNUSED)
+{
+ cselib_invalidate_rtx (dest);
}
/* Record the result of a SET instruction. DEST is being set; the source
static void
cselib_record_set (rtx dest, cselib_val *src_elt, cselib_val *dest_addr_elt)
{
- int dreg = GET_CODE (dest) == REG ? (int) REGNO (dest) : -1;
+ int dreg = REG_P (dest) ? (int) REGNO (dest) : -1;
if (src_elt == 0 || side_effects_p (dest))
return;
}
else
{
- if (REG_VALUES (dreg)->elt == 0)
- REG_VALUES (dreg)->elt = src_elt;
- else
- /* The register should have been invalidated. */
- abort ();
+ /* The register should have been invalidated. */
+ gcc_assert (REG_VALUES (dreg)->elt == 0);
+ REG_VALUES (dreg)->elt = src_elt;
}
if (src_elt->locs == 0)
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 (MEM_P (dest) && dest_addr_elt != 0
+ && cselib_record_memory)
{
if (src_elt->locs == 0)
n_useless_values--;
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 (REG_P (dest)
+ || (MEM_P (dest) && cselib_record_memory))
{
rtx src = sets[i].src;
if (cond)
src = gen_rtx_IF_THEN_ELSE (GET_MODE (src), cond, src, dest);
sets[i].src_elt = cselib_lookup (src, GET_MODE (dest), 1);
- if (GET_CODE (dest) == MEM)
+ if (MEM_P (dest))
sets[i].dest_addr_elt = cselib_lookup (XEXP (dest, 0), Pmode, 1);
else
sets[i].dest_addr_elt = 0;
/* Invalidate all locations written by this insn. Note that the elts we
looked up in the previous loop aren't affected, just some of their
locations may go away. */
- note_stores (body, cselib_invalidate_rtx, NULL);
+ note_stores (body, cselib_invalidate_rtx_note_stores, NULL);
/* If this is an asm, look for duplicate sets. This can happen when the
user uses the same value as an output multiple times. This is valid
for (i = 0; i < n_sets; i++)
{
rtx dest = sets[i].dest;
- if (GET_CODE (dest) == REG || GET_CODE (dest) == MEM)
+ if (REG_P (dest) || MEM_P (dest))
{
int j;
for (j = i + 1; j < n_sets; j++)
for (i = 0; i < n_sets; i++)
{
rtx dest = sets[i].dest;
- if (GET_CODE (dest) == REG || GET_CODE (dest) == MEM)
+ if (REG_P (dest)
+ || (MEM_P (dest) && cselib_record_memory))
cselib_record_set (dest, sets[i].src_elt, sets[i].dest_addr_elt);
}
}
if (find_reg_note (insn, REG_LIBCALL, NULL))
cselib_current_insn_in_libcall = true;
- if (find_reg_note (insn, REG_RETVAL, NULL))
- cselib_current_insn_in_libcall = false;
cselib_current_insn = insn;
/* Forget everything at a CODE_LABEL, a volatile asm, or a setjmp. */
- if (GET_CODE (insn) == CODE_LABEL
- || (GET_CODE (insn) == CALL_INSN
+ if (LABEL_P (insn)
+ || (CALL_P (insn)
&& find_reg_note (insn, REG_SETJMP, NULL))
- || (GET_CODE (insn) == INSN
+ || (NONJUMP_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) == ASM_OPERANDS
&& MEM_VOLATILE_P (PATTERN (insn))))
{
- clear_table ();
+ if (find_reg_note (insn, REG_RETVAL, NULL))
+ cselib_current_insn_in_libcall = false;
+ cselib_clear_table ();
return;
}
if (! INSN_P (insn))
{
+ if (find_reg_note (insn, REG_RETVAL, NULL))
+ cselib_current_insn_in_libcall = false;
cselib_current_insn = 0;
return;
}
/* If this is a call instruction, forget anything stored in a
call clobbered register, or, if this is not a const call, in
memory. */
- if (GET_CODE (insn) == CALL_INSN)
+ if (CALL_P (insn))
{
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- if (call_used_regs[i])
+ if (call_used_regs[i]
+ || (REG_VALUES (i) && REG_VALUES (i)->elt
+ && HARD_REGNO_CALL_PART_CLOBBERED (i,
+ GET_MODE (REG_VALUES (i)->elt->u.val_rtx))))
cselib_invalidate_regno (i, reg_raw_mode[i]);
if (! CONST_OR_PURE_CALL_P (insn))
unlikely to help. */
for (x = REG_NOTES (insn); x; x = XEXP (x, 1))
if (REG_NOTE_KIND (x) == REG_INC)
- cselib_invalidate_rtx (XEXP (x, 0), NULL_RTX, NULL);
+ cselib_invalidate_rtx (XEXP (x, 0));
#endif
/* Look for any CLOBBERs in CALL_INSN_FUNCTION_USAGE, but only
after we have processed the insn. */
- if (GET_CODE (insn) == CALL_INSN)
+ if (CALL_P (insn))
for (x = CALL_INSN_FUNCTION_USAGE (insn); x; x = XEXP (x, 1))
if (GET_CODE (XEXP (x, 0)) == CLOBBER)
- cselib_invalidate_rtx (XEXP (XEXP (x, 0), 0), NULL_RTX, NULL);
+ cselib_invalidate_rtx (XEXP (XEXP (x, 0), 0));
+ if (find_reg_note (insn, REG_RETVAL, NULL))
+ cselib_current_insn_in_libcall = false;
cselib_current_insn = 0;
if (n_useless_values > MAX_USELESS_VALUES)
init_alias_analysis. */
void
-cselib_init (void)
+cselib_init (bool record_memory)
{
elt_list_pool = create_alloc_pool ("elt_list",
sizeof (struct elt_list), 10);
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);
free_alloc_pool (elt_loc_list_pool);
free_alloc_pool (cselib_val_pool);
free_alloc_pool (value_pool);
- clear_table ();
+ cselib_clear_table ();
htab_delete (hash_table);
- reg_values = 0;
free (used_regs);
used_regs = 0;
hash_table = 0;
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