/* Perform various loop optimizations, including strength reduction.
Copyright (C) 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#include "insn-flags.h"
#include "optabs.h"
#include "cfgloop.h"
+#include "ggc.h"
/* Not really meaningful values, but at least something. */
#ifndef SIMULTANEOUS_PREFETCHES
#define LOOP_REGNO_NREGS(REGNO, SET_DEST) \
((REGNO) < FIRST_PSEUDO_REGISTER \
- ? (int) HARD_REGNO_NREGS ((REGNO), GET_MODE (SET_DEST)) : 1)
+ ? (int) hard_regno_nregs[(REGNO)][GET_MODE (SET_DEST)] : 1)
/* Vector mapping INSN_UIDs to luids.
#endif
static rtx skip_consec_insns (rtx, int);
static int libcall_benefit (rtx);
+static rtx libcall_other_reg (rtx, rtx);
+static void record_excess_regs (rtx, rtx, rtx *);
static void ignore_some_movables (struct loop_movables *);
static void force_movables (struct loop_movables *);
static void combine_movables (struct loop_movables *, struct loop_regs *);
struct loop *loop = &loops->array[i];
if (! loop->invalid && loop->end)
- scan_loop (loop, flags);
+ {
+ scan_loop (loop, flags);
+ ggc_collect ();
+ }
}
end_alias_analysis ();
/* Clean up. */
+ for (i = 0; i < (int) loops->num; i++)
+ free (loops_info[i].mems);
+
free (uid_luid);
free (uid_loop);
free (loops_info);
/* Add elements to *OUTPUT to record all the pseudo-regs
mentioned in IN_THIS but not mentioned in NOT_IN_THIS. */
-void
+static void
record_excess_regs (rtx in_this, rtx not_in_this, rtx *output)
{
enum rtx_code code;
If there are none, return 0.
If there are one or more, return an EXPR_LIST containing all of them. */
-rtx
+static rtx
libcall_other_reg (rtx insn, rtx equiv)
{
rtx note = find_reg_note (insn, REG_RETVAL, NULL_RTX);
m = 0;
/* Increase the priority of the moving the first insn
- since it permits the second to be moved as well. */
+ since it permits the second to be moved as well.
+ Likewise for insns already forced by the first insn. */
if (m != 0)
{
+ struct movable *m2;
+
m->forces = m1;
- m1->lifetime += m->lifetime;
- m1->savings += m->savings;
+ for (m2 = m1; m2; m2 = m2->forces)
+ {
+ m2->lifetime += m->lifetime;
+ m2->savings += m->savings;
+ }
}
}
}
loop_info->has_multiple_exit_targets = 1;
}
}
- /* FALLTHRU */
+ /* Fall through. */
case INSN:
if (volatile_refs_p (PATTERN (insn)))
/* If loop_invariant_p ever returned 2, we return 2. */
return 1 + (value & 2);
}
-
-#if 0
-/* I don't think this condition is sufficient to allow INSN
- to be moved, so we no longer test it. */
-
-/* Return 1 if all insns in the basic block of INSN and following INSN
- that set REG are invariant according to TABLE. */
-
-static int
-all_sets_invariant_p (rtx reg, rtx insn, short *table)
-{
- rtx p = insn;
- int regno = REGNO (reg);
-
- while (1)
- {
- enum rtx_code code;
- p = NEXT_INSN (p);
- code = GET_CODE (p);
- if (code == CODE_LABEL || code == JUMP_INSN)
- return 1;
- if (code == INSN && GET_CODE (PATTERN (p)) == SET
- && GET_CODE (SET_DEST (PATTERN (p))) == REG
- && REGNO (SET_DEST (PATTERN (p))) == regno)
- {
- if (! loop_invariant_p (loop, SET_SRC (PATTERN (p)), table))
- return 0;
- }
- }
-}
-#endif /* 0 */
\f
/* Look at all uses (not sets) of registers in X. For each, if it is
the single use, set USAGE[REGNO] to INSN; if there was a previous use in
if (code != GET_CODE (y))
return 0;
- code = GET_CODE (x);
-
- if (GET_RTX_CLASS (code) == 'c')
+ if (COMMUTATIVE_ARITH_P (x))
{
return ((rtx_equal_for_prefetch_p (XEXP (x, 0), XEXP (y, 0))
&& rtx_equal_for_prefetch_p (XEXP (x, 1), XEXP (y, 1)))
|| (rtx_equal_for_prefetch_p (XEXP (x, 0), XEXP (y, 1))
&& rtx_equal_for_prefetch_p (XEXP (x, 1), XEXP (y, 0))));
}
+
/* Compare the elements. If any pair of corresponding elements fails to
match, return 0 for the whole thing. */
&& unrolled_insn_copies <= insn_count))
unroll_loop (loop, insn_count, 1);
-#ifdef HAVE_doloop_end
- if (HAVE_doloop_end && (flags & LOOP_BCT) && flag_branch_on_count_reg)
- doloop_optimize (loop);
-#endif /* HAVE_doloop_end */
-
- /* In case number of iterations is known, drop branch prediction note
- in the branch. Do that only in second loop pass, as loop unrolling
- may change the number of iterations performed. */
- if (flags & LOOP_BCT)
- {
- unsigned HOST_WIDE_INT n
- = loop_info->n_iterations / loop_info->unroll_number;
- if (n > 1)
- predict_insn (prev_nonnote_insn (loop->end), PRED_LOOP_ITERATIONS,
- REG_BR_PROB_BASE - REG_BR_PROB_BASE / n);
- }
-
if (loop_dump_stream)
fprintf (loop_dump_stream, "\n");
*MULT_VAL to CONST0_RTX, and store the invariant into *INC_VAL.
We also want to detect a BIV when it corresponds to a variable
- whose mode was promoted via PROMOTED_MODE. In that case, an increment
+ whose mode was promoted. In that case, an increment
of the variable may be a PLUS that adds a SUBREG of that variable to
an invariant and then sign- or zero-extends the result of the PLUS
into the variable.
struct loop_ivs *ivs = LOOP_IVS (loop);
struct iv_class *bl;
rtx reg;
+ enum machine_mode mode;
rtx jump_label;
rtx final_value;
rtx start_value;
&& (INTVAL (bl->initial_value)
% (-INTVAL (bl->biv->add_val))) == 0)
{
- /* register always nonnegative, add REG_NOTE to branch */
+ /* Register always nonnegative, add REG_NOTE to branch. */
if (! find_reg_note (jump, REG_NONNEG, NULL_RTX))
REG_NOTES (jump)
= gen_rtx_EXPR_LIST (REG_NONNEG, bl->biv->dest_reg,
/* Save some info needed to produce the new insns. */
reg = bl->biv->dest_reg;
+ mode = GET_MODE (reg);
jump_label = condjump_label (PREV_INSN (loop_end));
new_add_val = GEN_INT (-INTVAL (bl->biv->add_val));
if (initial_value == const0_rtx
&& GET_CODE (comparison_value) == CONST_INT)
{
- start_value = GEN_INT (comparison_val - add_adjust);
+ start_value
+ = gen_int_mode (comparison_val - add_adjust, mode);
loop_insn_hoist (loop, gen_move_insn (reg, start_value));
}
else if (GET_CODE (initial_value) == CONST_INT)
{
- enum machine_mode mode = GET_MODE (reg);
rtx offset = GEN_INT (-INTVAL (initial_value) - add_adjust);
rtx add_insn = gen_add3_insn (reg, comparison_value, offset);
}
else if (! add_adjust)
{
- enum machine_mode mode = GET_MODE (reg);
rtx sub_insn = gen_sub3_insn (reg, comparison_value,
initial_value);
/* Add new compare/branch insn at end of loop. */
start_sequence ();
emit_cmp_and_jump_insns (reg, const0_rtx, cmp_code, NULL_RTX,
- GET_MODE (reg), 0,
+ mode, 0,
XEXP (jump_label, 0));
tem = get_insns ();
end_sequence ();
rtx note;
/* If this is a libcall that sets a giv, skip ahead to its end. */
- if (GET_RTX_CLASS (code) == 'i')
+ if (INSN_P (p))
{
note = find_reg_note (p, REG_LIBCALL, NULL_RTX);
the same tests as a function of STORE_FLAG_VALUE as find_comparison_args
in cse.c */
- while (GET_RTX_CLASS (code) == '<'
+ while ((GET_RTX_CLASS (code) == RTX_COMPARE
+ || GET_RTX_CLASS (code) == RTX_COMM_COMPARE)
&& op1 == CONST0_RTX (GET_MODE (op0))
&& op0 != want_reg)
{
REAL_VALUE_NEGATIVE (fsfv)))
#endif
))
- && GET_RTX_CLASS (GET_CODE (SET_SRC (set))) == '<'))
+ && COMPARISON_P (SET_SRC (set))))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
REAL_VALUE_NEGATIVE (fsfv)))
#endif
))
- && GET_RTX_CLASS (GET_CODE (SET_SRC (set))) == '<'
+ && COMPARISON_P (SET_SRC (set))
&& (((GET_MODE_CLASS (mode) == MODE_CC)
== (GET_MODE_CLASS (inner_mode) == MODE_CC))
|| mode == VOIDmode || inner_mode == VOIDmode))
if (x)
{
- if (GET_RTX_CLASS (GET_CODE (x)) == '<')
+ if (COMPARISON_P (x))
code = GET_CODE (x);
if (reverse_code)
{
for (i = 0; i < loop_info->mems_idx; ++i)
if (rtx_equal_p (m, loop_info->mems[i].mem))
{
+ if (MEM_VOLATILE_P (m) && !MEM_VOLATILE_P (loop_info->mems[i].mem))
+ loop_info->mems[i].mem = m;
if (GET_MODE (m) != GET_MODE (loop_info->mems[i].mem))
/* The modes of the two memory accesses are different. If
this happens, something tricky is going on, and we just
;
prev_ebb_head = p;
- cselib_init ();
+ cselib_init (true);
/* Build table of mems that get set to constant values before the
loop. */
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