/* If-conversion support.
- Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010
Free Software Foundation, Inc.
This file is part of GCC.
#include "hard-reg-set.h"
#include "basic-block.h"
#include "expr.h"
-#include "real.h"
#include "output.h"
#include "optabs.h"
#include "toplev.h"
#include "vecprim.h"
#include "dbgcnt.h"
-#ifndef HAVE_conditional_execution
-#define HAVE_conditional_execution 0
-#endif
#ifndef HAVE_conditional_move
#define HAVE_conditional_move 0
#endif
#ifndef HAVE_trap
#define HAVE_trap 0
#endif
-#ifndef HAVE_conditional_trap
-#define HAVE_conditional_trap 0
-#endif
#ifndef MAX_CONDITIONAL_EXECUTE
#define MAX_CONDITIONAL_EXECUTE \
insn = NEXT_INSN (insn);
}
- while (NOTE_P (insn))
+ while (NOTE_P (insn) || DEBUG_INSN_P (insn))
{
if (insn == BB_END (bb))
return NULL_RTX;
while (NOTE_P (insn)
|| JUMP_P (insn)
+ || DEBUG_INSN_P (insn)
|| (skip_use_p
&& NONJUMP_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) == USE))
for (insn = start; ; insn = NEXT_INSN (insn))
{
- if (NOTE_P (insn))
+ if (NOTE_P (insn) || DEBUG_INSN_P (insn))
goto insn_done;
gcc_assert(NONJUMP_INSN_P (insn) || CALL_P (insn));
rtx false_expr; /* test for then block insns */
rtx true_prob_val; /* probability of else block */
rtx false_prob_val; /* probability of then block */
- int n_insns;
+ rtx then_last_head = NULL_RTX; /* Last match at the head of THEN */
+ rtx else_last_head = NULL_RTX; /* Last match at the head of ELSE */
+ rtx then_first_tail = NULL_RTX; /* First match at the tail of THEN */
+ rtx else_first_tail = NULL_RTX; /* First match at the tail of ELSE */
+ int then_n_insns, else_n_insns, n_insns;
enum rtx_code false_code;
/* If test is comprised of && or || elements, and we've failed at handling
number of insns and see if it is small enough to convert. */
then_start = first_active_insn (then_bb);
then_end = last_active_insn (then_bb, TRUE);
- n_insns = ce_info->num_then_insns = count_bb_insns (then_bb);
+ then_n_insns = ce_info->num_then_insns = count_bb_insns (then_bb);
+ n_insns = then_n_insns;
max = MAX_CONDITIONAL_EXECUTE;
if (else_bb)
{
+ int n_matching;
+
max *= 2;
else_start = first_active_insn (else_bb);
else_end = last_active_insn (else_bb, TRUE);
- n_insns += ce_info->num_else_insns = count_bb_insns (else_bb);
+ else_n_insns = ce_info->num_else_insns = count_bb_insns (else_bb);
+ n_insns += else_n_insns;
+
+ /* Look for matching sequences at the head and tail of the two blocks,
+ and limit the range of insns to be converted if possible. */
+ n_matching = flow_find_cross_jump (then_bb, else_bb,
+ &then_first_tail, &else_first_tail);
+ if (then_first_tail == BB_HEAD (then_bb))
+ then_start = then_end = NULL_RTX;
+ if (else_first_tail == BB_HEAD (else_bb))
+ else_start = else_end = NULL_RTX;
+
+ if (n_matching > 0)
+ {
+ if (then_end)
+ then_end = prev_active_insn (then_first_tail);
+ if (else_end)
+ else_end = prev_active_insn (else_first_tail);
+ n_insns -= 2 * n_matching;
+ }
+
+ if (then_start && else_start)
+ {
+ int longest_match = MIN (then_n_insns - n_matching,
+ else_n_insns - n_matching);
+ n_matching
+ = flow_find_head_matching_sequence (then_bb, else_bb,
+ &then_last_head,
+ &else_last_head,
+ longest_match);
+
+ if (n_matching > 0)
+ {
+ rtx insn;
+
+ /* We won't pass the insns in the head sequence to
+ cond_exec_process_insns, so we need to test them here
+ to make sure that they don't clobber the condition. */
+ for (insn = BB_HEAD (then_bb);
+ insn != NEXT_INSN (then_last_head);
+ insn = NEXT_INSN (insn))
+ if (!LABEL_P (insn) && !NOTE_P (insn)
+ && !DEBUG_INSN_P (insn)
+ && modified_in_p (test_expr, insn))
+ return FALSE;
+ }
+
+ if (then_last_head == then_end)
+ then_start = then_end = NULL_RTX;
+ if (else_last_head == else_end)
+ else_start = else_end = NULL_RTX;
+
+ if (n_matching > 0)
+ {
+ if (then_start)
+ then_start = next_active_insn (then_last_head);
+ if (else_start)
+ else_start = next_active_insn (else_last_head);
+ n_insns -= 2 * n_matching;
+ }
+ }
}
if (n_insns > max)
fprintf (dump_file, "%d insn%s converted to conditional execution.\n",
n_insns, (n_insns == 1) ? " was" : "s were");
- /* Merge the blocks! */
+ /* Merge the blocks! If we had matching sequences, make sure to delete one
+ copy at the appropriate location first: delete the copy in the THEN branch
+ for a tail sequence so that the remaining one is executed last for both
+ branches, and delete the copy in the ELSE branch for a head sequence so
+ that the remaining one is executed first for both branches. */
+ if (then_first_tail)
+ {
+ rtx from = then_first_tail;
+ if (!INSN_P (from))
+ from = next_active_insn (from);
+ delete_insn_chain (from, BB_END (then_bb), false);
+ }
+ if (else_last_head)
+ delete_insn_chain (first_active_insn (else_bb), else_last_head, false);
+
merge_if_block (ce_info);
cond_exec_changed_p = TRUE;
return TRUE;
build the store_flag insn directly. */
if (cond_complex)
- cond = XEXP (SET_SRC (pc_set (if_info->jump)), 0);
+ {
+ rtx set = pc_set (if_info->jump);
+ cond = XEXP (SET_SRC (set), 0);
+ if (GET_CODE (XEXP (SET_SRC (set), 2)) == LABEL_REF
+ && XEXP (XEXP (SET_SRC (set), 2), 0) == JUMP_LABEL (if_info->jump))
+ reversep = !reversep;
+ if (if_info->then_else_reversed)
+ reversep = !reversep;
+ }
if (reversep)
code = reversed_comparison_code (cond, if_info->jump);
int reversep;
rtx target, seq;
- if (GET_CODE (if_info->b) == CONST_INT
+ if (CONST_INT_P (if_info->b)
&& INTVAL (if_info->b) == STORE_FLAG_VALUE
&& if_info->a == const0_rtx)
reversep = 0;
else if (if_info->b == const0_rtx
- && GET_CODE (if_info->a) == CONST_INT
+ && CONST_INT_P (if_info->a)
&& INTVAL (if_info->a) == STORE_FLAG_VALUE
&& (reversed_comparison_code (if_info->cond, if_info->jump)
!= UNKNOWN))
int normalize, can_reverse;
enum machine_mode mode;
- if (GET_CODE (if_info->a) == CONST_INT
- && GET_CODE (if_info->b) == CONST_INT)
+ if (CONST_INT_P (if_info->a)
+ && CONST_INT_P (if_info->b))
{
mode = GET_MODE (if_info->x);
ifalse = INTVAL (if_info->a);
/* ??? FIXME: Magic number 5. */
if (cse_not_expected
&& MEM_P (a) && MEM_P (b)
+ && MEM_ADDR_SPACE (a) == MEM_ADDR_SPACE (b)
&& if_info->branch_cost >= 5)
{
+ enum machine_mode address_mode
+ = targetm.addr_space.address_mode (MEM_ADDR_SPACE (a));
+
a = XEXP (a, 0);
b = XEXP (b, 0);
- x = gen_reg_rtx (Pmode);
+ x = gen_reg_rtx (address_mode);
is_mem = 1;
}
if insn_rtx_cost can't be estimated. */
if (insn_a)
{
- insn_cost = insn_rtx_cost (PATTERN (insn_a),
- optimize_bb_for_speed_p (BLOCK_FOR_INSN (insn_a)));
+ insn_cost
+ = insn_rtx_cost (PATTERN (insn_a),
+ optimize_bb_for_speed_p (BLOCK_FOR_INSN (insn_a)));
if (insn_cost == 0 || insn_cost > COSTS_N_INSNS (if_info->branch_cost))
return FALSE;
}
if (insn_b)
{
- insn_cost += insn_rtx_cost (PATTERN (insn_b),
- optimize_bb_for_speed_p (BLOCK_FOR_INSN (insn_b)));
+ insn_cost
+ += insn_rtx_cost (PATTERN (insn_b),
+ optimize_bb_for_speed_p (BLOCK_FOR_INSN (insn_b)));
if (insn_cost == 0 || insn_cost > COSTS_N_INSNS (if_info->branch_cost))
return FALSE;
}
set_mem_align (tmp,
MIN (MEM_ALIGN (if_info->a), MEM_ALIGN (if_info->b)));
+ gcc_assert (MEM_ADDR_SPACE (if_info->a) == MEM_ADDR_SPACE (if_info->b));
+ set_mem_addr_space (tmp, MEM_ADDR_SPACE (if_info->a));
+
noce_emit_move_insn (if_info->x, tmp);
}
else if (target != x)
make equivalent types of changes) to get the constants we need
if they're off by one in the right direction. */
- if (GET_CODE (target) == CONST_INT)
+ if (CONST_INT_P (target))
{
enum rtx_code code = GET_CODE (if_info->cond);
rtx op_a = XEXP (if_info->cond, 0);
/* First, look to see if we put a constant in a register. */
prev_insn = prev_nonnote_insn (if_info->cond_earliest);
if (prev_insn
- && BLOCK_NUM (prev_insn) == BLOCK_NUM (if_info->cond_earliest)
+ && BLOCK_FOR_INSN (prev_insn)
+ == BLOCK_FOR_INSN (if_info->cond_earliest)
&& INSN_P (prev_insn)
&& GET_CODE (PATTERN (prev_insn)) == SET)
{
rtx src = find_reg_equal_equiv_note (prev_insn);
if (!src)
src = SET_SRC (PATTERN (prev_insn));
- if (GET_CODE (src) == CONST_INT)
+ if (CONST_INT_P (src))
{
if (rtx_equal_p (op_a, SET_DEST (PATTERN (prev_insn))))
op_a = src;
else if (rtx_equal_p (op_b, SET_DEST (PATTERN (prev_insn))))
op_b = src;
- if (GET_CODE (op_a) == CONST_INT)
+ if (CONST_INT_P (op_a))
{
rtx tmp = op_a;
op_a = op_b;
/* Now, look to see if we can get the right constant by
adjusting the conditional. */
- if (GET_CODE (op_b) == CONST_INT)
+ if (CONST_INT_P (op_b))
{
HOST_WIDE_INT desired_val = INTVAL (target);
HOST_WIDE_INT actual_val = INTVAL (op_b);
return TRUE;
}
-/* Convert "if (a < 0) x = -a; else x = a;" to "x = abs(a);", etc. */
+/* Convert "if (a < 0) x = -a; else x = a;" to "x = abs(a);",
+ "if (a < 0) x = ~a; else x = a;" to "x = one_cmpl_abs(a);",
+ etc. */
static int
noce_try_abs (struct noce_if_info *if_info)
{
rtx cond, earliest, target, seq, a, b, c;
int negate;
+ bool one_cmpl = false;
/* Reject modes with signed zeros. */
if (HONOR_SIGNED_ZEROS (GET_MODE (if_info->x)))
c = a; a = b; b = c;
negate = 1;
}
+ else if (GET_CODE (a) == NOT && rtx_equal_p (XEXP (a, 0), b))
+ {
+ negate = 0;
+ one_cmpl = true;
+ }
+ else if (GET_CODE (b) == NOT && rtx_equal_p (XEXP (b, 0), a))
+ {
+ c = a; a = b; b = c;
+ negate = 1;
+ one_cmpl = true;
+ }
else
return FALSE;
{
rtx set, insn = prev_nonnote_insn (earliest);
if (insn
- && BLOCK_NUM (insn) == BLOCK_NUM (earliest)
+ && BLOCK_FOR_INSN (insn) == BLOCK_FOR_INSN (earliest)
&& (set = single_set (insn))
&& rtx_equal_p (SET_DEST (set), c))
{
}
start_sequence ();
-
- target = expand_abs_nojump (GET_MODE (if_info->x), b, if_info->x, 1);
+ if (one_cmpl)
+ target = expand_one_cmpl_abs_nojump (GET_MODE (if_info->x), b,
+ if_info->x);
+ else
+ target = expand_abs_nojump (GET_MODE (if_info->x), b, if_info->x, 1);
/* ??? It's a quandary whether cmove would be better here, especially
for integers. Perhaps combine will clean things up. */
if (target && negate)
- target = expand_simple_unop (GET_MODE (target), NEG, target, if_info->x, 0);
+ {
+ if (one_cmpl)
+ target = expand_simple_unop (GET_MODE (target), NOT, target,
+ if_info->x, 0);
+ else
+ target = expand_simple_unop (GET_MODE (target), NEG, target,
+ if_info->x, 0);
+ }
if (! target)
{
rtx cond, t, m, c, seq;
enum machine_mode mode;
enum rtx_code code;
- bool b_unconditional;
+ bool t_unconditional;
cond = if_info->cond;
code = GET_CODE (cond);
if (GET_MODE (m) != mode)
return FALSE;
- /* This is only profitable if T is cheap, or T is unconditionally
- executed/evaluated in the original insn sequence. The latter
- happens if INSN_B was taken from TEST_BB, or if there was no
- INSN_B which can happen for e.g. conditional stores to memory. */
- b_unconditional = (if_info->insn_b == NULL_RTX
- || BLOCK_FOR_INSN (if_info->insn_b) == if_info->test_bb);
- if (rtx_cost (t, SET, optimize_bb_for_speed_p (BLOCK_FOR_INSN (if_info->insn_b)))
- >= COSTS_N_INSNS (2)
- && (!b_unconditional
- || t != if_info->b))
+ /* This is only profitable if T is unconditionally executed/evaluated in the
+ original insn sequence or T is cheap. The former happens if B is the
+ non-zero (T) value and if INSN_B was taken from TEST_BB, or there was no
+ INSN_B which can happen for e.g. conditional stores to memory. For the
+ cost computation use the block TEST_BB where the evaluation will end up
+ after the transformation. */
+ t_unconditional =
+ (t == if_info->b
+ && (if_info->insn_b == NULL_RTX
+ || BLOCK_FOR_INSN (if_info->insn_b) == if_info->test_bb));
+ if (!(t_unconditional
+ || (rtx_cost (t, SET, optimize_bb_for_speed_p (if_info->test_bb))
+ < COSTS_N_INSNS (2))))
return FALSE;
start_sequence ();
if (GET_CODE (cond) == ZERO_EXTRACT)
{
if (XEXP (cond, 1) != const1_rtx
- || GET_CODE (XEXP (cond, 2)) != CONST_INT
+ || !CONST_INT_P (XEXP (cond, 2))
|| ! rtx_equal_p (x, XEXP (cond, 0)))
return FALSE;
bitnum = INTVAL (XEXP (cond, 2));
{
/* Check for "if (X & C) x = x op C". */
if (! rtx_equal_p (x, XEXP (a, 0))
- || GET_CODE (XEXP (a, 1)) != CONST_INT
+ || !CONST_INT_P (XEXP (a, 1))
|| (INTVAL (XEXP (a, 1)) & GET_MODE_MASK (mode))
!= (unsigned HOST_WIDE_INT) 1 << bitnum)
return FALSE;
{
/* Check for "if (X & C) x &= ~C". */
if (! rtx_equal_p (x, XEXP (a, 0))
- || GET_CODE (XEXP (a, 1)) != CONST_INT
+ || !CONST_INT_P (XEXP (a, 1))
|| (INTVAL (XEXP (a, 1)) & GET_MODE_MASK (mode))
!= (~((HOST_WIDE_INT) 1 << bitnum) & GET_MODE_MASK (mode)))
return FALSE;
addr = XEXP (addr, 1);
break;
case PLUS:
- if (GET_CODE (XEXP (addr, 1)) == CONST_INT)
+ if (CONST_INT_P (XEXP (addr, 1)))
addr = XEXP (addr, 0);
else
return false;
else
{
insn_b = prev_nonnote_insn (if_info->cond_earliest);
+ while (insn_b && DEBUG_INSN_P (insn_b))
+ insn_b = prev_nonnote_insn (insn_b);
/* We're going to be moving the evaluation of B down from above
COND_EARLIEST to JUMP. Make sure the relevant data is still
intact. */
if (! insn_b
- || BLOCK_NUM (insn_b) != BLOCK_NUM (if_info->cond_earliest)
+ || BLOCK_FOR_INSN (insn_b) != BLOCK_FOR_INSN (if_info->cond_earliest)
|| !NONJUMP_INSN_P (insn_b)
|| (set_b = single_set (insn_b)) == NULL_RTX
|| ! rtx_equal_p (x, SET_DEST (set_b))
|| ! noce_operand_ok (SET_SRC (set_b))
|| reg_overlap_mentioned_p (x, SET_SRC (set_b))
- || modified_between_p (SET_SRC (set_b),
- PREV_INSN (if_info->cond_earliest), jump)
+ || modified_between_p (SET_SRC (set_b), insn_b, jump)
/* Likewise with X. In particular this can happen when
noce_get_condition looks farther back in the instruction
stream than one might expect. */
|| reg_overlap_mentioned_p (x, cond)
|| reg_overlap_mentioned_p (x, a)
- || modified_between_p (x, PREV_INSN (if_info->cond_earliest), jump))
+ || modified_between_p (x, insn_b, jump))
insn_b = set_b = NULL_RTX;
}
the lifetime of hard registers on small register class machines. */
orig_x = x;
if (!REG_P (x)
- || (SMALL_REGISTER_CLASSES
- && REGNO (x) < FIRST_PSEUDO_REGISTER))
+ || (HARD_REGISTER_P (x)
+ && targetm.small_register_classes_for_mode_p (GET_MODE (x))))
{
if (GET_MODE (x) == BLKmode)
return FALSE;
if (GET_CODE (x) == ZERO_EXTRACT
- && (GET_CODE (XEXP (x, 1)) != CONST_INT
- || GET_CODE (XEXP (x, 2)) != CONST_INT))
+ && (!CONST_INT_P (XEXP (x, 1))
+ || !CONST_INT_P (XEXP (x, 2))))
return FALSE;
x = gen_reg_rtx (GET_MODE (GET_CODE (x) == STRICT_LOW_PART
if (HAVE_conditional_move
&& noce_try_cmove (if_info))
goto success;
- if (! HAVE_conditional_execution)
+ if (! targetm.have_conditional_execution ())
{
if (noce_try_store_flag_constants (if_info))
goto success;
REGS. COND is the condition we will test. */
static int
-check_cond_move_block (basic_block bb, rtx *vals, VEC (int, heap) **regs, rtx cond)
+check_cond_move_block (basic_block bb, rtx *vals, VEC (int, heap) **regs,
+ rtx cond)
{
rtx insn;
{
rtx set, dest, src;
- if (!INSN_P (insn) || JUMP_P (insn))
+ if (!NONDEBUG_INSN_P (insn) || JUMP_P (insn))
continue;
set = single_set (insn);
if (!set)
dest = SET_DEST (set);
src = SET_SRC (set);
if (!REG_P (dest)
- || (SMALL_REGISTER_CLASSES && HARD_REGISTER_P (dest)))
+ || (HARD_REGISTER_P (dest)
+ && targetm.small_register_classes_for_mode_p (GET_MODE (dest))))
return FALSE;
if (!CONSTANT_P (src) && !register_operand (src, VOIDmode))
rtx set, target, dest, t, e;
unsigned int regno;
- if (!INSN_P (insn) || JUMP_P (insn))
+ /* ??? Maybe emit conditional debug insn? */
+ if (!NONDEBUG_INSN_P (insn) || JUMP_P (insn))
continue;
set = single_set (insn);
gcc_assert (set && REG_P (SET_DEST (set)));
/* Make sure the blocks are suitable. */
if (!check_cond_move_block (then_bb, then_vals, &then_regs, cond)
- || (else_bb && !check_cond_move_block (else_bb, else_vals, &else_regs, cond)))
+ || (else_bb
+ && !check_cond_move_block (else_bb, else_vals, &else_regs, cond)))
{
VEC_free (int, heap, then_regs);
VEC_free (int, heap, else_regs);
Return TRUE if we were successful at converting the block. */
static int
-noce_find_if_block (basic_block test_bb,
- edge then_edge, edge else_edge,
+noce_find_if_block (basic_block test_bb, edge then_edge, edge else_edge,
int pass)
{
basic_block then_bb, else_bb, join_bb;
return FALSE;
/* If this is not a standard conditional jump, we can't parse it. */
- cond = noce_get_condition (jump,
- &cond_earliest,
- then_else_reversed);
+ cond = noce_get_condition (jump, &cond_earliest, then_else_reversed);
if (!cond)
return FALSE;
/* Otherwise this must be a multiway branch of some sort. */
return NULL;
- memset (&ce_info, '\0', sizeof (ce_info));
+ memset (&ce_info, 0, sizeof (ce_info));
ce_info.test_bb = test_bb;
ce_info.then_bb = then_edge->dest;
ce_info.else_bb = else_edge->dest;
IFCVT_INIT_EXTRA_FIELDS (&ce_info);
#endif
- if (! reload_completed
+ if (!reload_completed
&& noce_find_if_block (test_bb, then_edge, else_edge, pass))
goto success;
- if (HAVE_conditional_execution && reload_completed
+ if (reload_completed
+ && targetm.have_conditional_execution ()
&& cond_exec_find_if_block (&ce_info))
goto success;
- if (HAVE_trap && HAVE_conditional_trap
+ if (HAVE_trap
+ && optab_handler (ctrap_optab, word_mode)->insn_code != CODE_FOR_nothing
&& find_cond_trap (test_bb, then_edge, else_edge))
goto success;
if (dom_info_state (CDI_POST_DOMINATORS) >= DOM_NO_FAST_QUERY
- && (! HAVE_conditional_execution || reload_completed))
+ && (reload_completed || !targetm.have_conditional_execution ()))
{
if (find_if_case_1 (test_bb, then_edge, else_edge))
goto success;
if (INSN_P (insn)
&& !JUMP_P (insn)
+ && !DEBUG_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) != USE
&& GET_CODE (PATTERN (insn)) != CLOBBER)
n_insns++;
ce_info->last_test_bb = test_bb;
/* We only ever should get here after reload,
- and only if we have conditional execution. */
- gcc_assert (HAVE_conditional_execution && reload_completed);
+ and if we have conditional execution. */
+ gcc_assert (reload_completed && targetm.have_conditional_execution ());
/* Discover if any fall through predecessors of the current test basic block
were && tests (which jump to the else block) or || tests (which jump to
if (EDGE_COUNT (then_bb->succs) > 0
&& (!single_succ_p (then_bb)
|| (single_succ_edge (then_bb)->flags & EDGE_COMPLEX)
- || (epilogue_completed && tablejump_p (BB_END (then_bb), NULL, NULL))))
+ || (epilogue_completed
+ && tablejump_p (BB_END (then_bb), NULL, NULL))))
return FALSE;
/* If the THEN block has no successors, conditional execution can still
else if (single_succ_p (else_bb)
&& single_succ (then_bb) == single_succ (else_bb)
&& single_pred_p (else_bb)
- && ! (single_succ_edge (else_bb)->flags & EDGE_COMPLEX)
- && ! (epilogue_completed && tablejump_p (BB_END (else_bb), NULL, NULL)))
+ && !(single_succ_edge (else_bb)->flags & EDGE_COMPLEX)
+ && !(epilogue_completed
+ && tablejump_p (BB_END (else_bb), NULL, NULL)))
join_bb = single_succ (else_bb);
/* Otherwise it is not an IF-THEN or IF-THEN-ELSE combination. */
test_bb->index, else_bb->index);
/* ELSE is small. */
- if (! cheap_bb_rtx_cost_p (else_bb,
+ if (! cheap_bb_rtx_cost_p (else_bb,
COSTS_N_INSNS (BRANCH_COST (optimize_bb_for_speed_p (else_edge->src),
predictable_edge_p (else_edge)))))
return FALSE;
basic_block other_bb, basic_block new_dest, int reversep)
{
rtx head, end, jump, earliest = NULL_RTX, old_dest, new_label = NULL_RTX;
+ /* Number of pending changes. */
+ int n_validated_changes = 0;
jump = BB_END (test_bb);
head = BB_HEAD (merge_bb);
end = BB_END (merge_bb);
+ while (DEBUG_INSN_P (end) && end != head)
+ end = PREV_INSN (end);
+
/* If merge_bb ends with a tablejump, predicating/moving insn's
into test_bb and then deleting merge_bb will result in the jumptable
that follows merge_bb being removed along with merge_bb and then we
if (LABEL_P (head))
head = NEXT_INSN (head);
+ while (DEBUG_INSN_P (head) && head != end)
+ head = NEXT_INSN (head);
if (NOTE_P (head))
{
if (head == end)
goto no_body;
}
head = NEXT_INSN (head);
+ while (DEBUG_INSN_P (head) && head != end)
+ head = NEXT_INSN (head);
}
if (JUMP_P (end))
goto no_body;
}
end = PREV_INSN (end);
+ while (DEBUG_INSN_P (end) && end != head)
+ end = PREV_INSN (end);
}
/* Disable handling dead code by conditional execution if the machine needs
to do anything funny with the tests, etc. */
#ifndef IFCVT_MODIFY_TESTS
- if (HAVE_conditional_execution)
+ if (targetm.have_conditional_execution ())
{
/* In the conditional execution case, we have things easy. We know
the condition is reversible. We don't have to check life info
prob_val = GEN_INT (REG_BR_PROB_BASE - INTVAL (prob_val));
}
- if (! cond_exec_process_insns ((ce_if_block_t *)0, head, end, cond,
- prob_val, 0))
- goto cancel;
+ if (cond_exec_process_insns (NULL, head, end, cond, prob_val, 0)
+ && verify_changes (0))
+ n_validated_changes = num_validated_changes ();
+ else
+ cancel_changes (0);
earliest = jump;
}
- else
#endif
+ /* Try the NCE path if the CE path did not result in any changes. */
+ if (n_validated_changes == 0)
{
/* In the non-conditional execution case, we have to verify that there
are no trapping operations, no calls, no references to memory, and
that any registers modified are dead at the branch site. */
rtx insn, cond, prev;
- bitmap merge_set, test_live, test_set;
+ bitmap merge_set, merge_set_noclobber, test_live, test_set;
unsigned i, fail = 0;
bitmap_iterator bi;
{
if (CALL_P (insn))
return FALSE;
- if (INSN_P (insn))
+ if (NONDEBUG_INSN_P (insn))
{
if (may_trap_p (PATTERN (insn)))
return FALSE;
/* Collect:
MERGE_SET = set of registers set in MERGE_BB
+ MERGE_SET_NOCLOBBER = like MERGE_SET, but only includes registers
+ that are really set, not just clobbered.
TEST_LIVE = set of registers live at EARLIEST
- TEST_SET = set of registers set between EARLIEST and the
- end of the block. */
+ TEST_SET = set of registers set between EARLIEST and the
+ end of the block. */
merge_set = BITMAP_ALLOC (®_obstack);
+ merge_set_noclobber = BITMAP_ALLOC (®_obstack);
test_live = BITMAP_ALLOC (®_obstack);
test_set = BITMAP_ALLOC (®_obstack);
FOR_BB_INSNS (merge_bb, insn)
{
- if (INSN_P (insn))
+ if (NONDEBUG_INSN_P (insn))
{
- unsigned int uid = INSN_UID (insn);
- struct df_ref **def_rec;
- for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
- {
- struct df_ref *def = *def_rec;
- bitmap_set_bit (merge_set, DF_REF_REGNO (def));
- }
+ df_simulate_find_defs (insn, merge_set);
+ df_simulate_find_noclobber_defs (insn, merge_set_noclobber);
}
}
/* For small register class machines, don't lengthen lifetimes of
hard registers before reload. */
- if (SMALL_REGISTER_CLASSES && ! reload_completed)
+ if (! reload_completed
+ && targetm.small_register_classes_for_mode_p (VOIDmode))
{
- EXECUTE_IF_SET_IN_BITMAP (merge_set, 0, i, bi)
+ EXECUTE_IF_SET_IN_BITMAP (merge_set_noclobber, 0, i, bi)
{
if (i < FIRST_PSEUDO_REGISTER
&& ! fixed_regs[i]
fail = 1;
}
}
-
+
/* For TEST, we're interested in a range of insns, not a whole block.
Moreover, we're interested in the insns live from OTHER_BB. */
-
- /* The loop below takes the set of live registers
+
+ /* The loop below takes the set of live registers
after JUMP, and calculates the live set before EARLIEST. */
bitmap_copy (test_live, df_get_live_in (other_bb));
- df_simulate_artificial_refs_at_end (test_bb, test_live);
+ df_simulate_initialize_backwards (test_bb, test_live);
for (insn = jump; ; insn = prev)
{
if (INSN_P (insn))
{
df_simulate_find_defs (insn, test_set);
- df_simulate_one_insn (test_bb, insn, test_live);
+ df_simulate_one_insn_backwards (test_bb, insn, test_live);
}
prev = PREV_INSN (insn);
if (insn == earliest)
}
/* We can perform the transformation if
- MERGE_SET & (TEST_SET | TEST_LIVE)
+ MERGE_SET_NOCLOBBER & TEST_SET
+ and
+ MERGE_SET & TEST_LIVE)
and
TEST_SET & DF_LIVE_IN (merge_bb)
are empty. */
- if (bitmap_intersect_p (test_set, merge_set)
+ if (bitmap_intersect_p (test_set, merge_set_noclobber)
|| bitmap_intersect_p (test_live, merge_set)
|| bitmap_intersect_p (test_set, df_get_live_in (merge_bb)))
fail = 1;
+ BITMAP_FREE (merge_set_noclobber);
BITMAP_FREE (merge_set);
BITMAP_FREE (test_live);
BITMAP_FREE (test_set);
goto cancel;
}
- if (! apply_change_group ())
- return FALSE;
+ if (verify_changes (n_validated_changes))
+ confirm_change_group ();
+ else
+ goto cancel;
if (other_bb != new_dest)
{
if (! note)
continue;
set = single_set (insn);
- if (!set || !function_invariant_p (SET_SRC (set)))
+ if (!set || !function_invariant_p (SET_SRC (set))
+ || !function_invariant_p (XEXP (note, 0)))
remove_note (insn, note);
} while (insn != end && (insn = NEXT_INSN (insn)));
FOR_EACH_BB (bb)
{
basic_block new_bb;
- while (!df_get_bb_dirty (bb)
+ while (!df_get_bb_dirty (bb)
&& (new_bb = find_if_header (bb, pass)) != NULL)
bb = new_bb;
}
#ifdef IFCVT_MULTIPLE_DUMPS
if (dump_file && cond_exec_changed_p)
- print_rtl_with_bb (dump_file, get_insns ());
+ {
+ if (dump_flags & TDF_SLIM)
+ print_rtl_slim_with_bb (dump_file, get_insns (), dump_flags);
+ else
+ print_rtl_with_bb (dump_file, get_insns ());
+ }
#endif
}
while (cond_exec_changed_p);
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