/* If-conversion support.
- Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GCC.
#include "optabs.h"
#include "toplev.h"
#include "tm_p.h"
+#include "cfgloop.h"
+#include "target.h"
#ifndef HAVE_conditional_execution
static dominance_info post_dominators;
/* Forward references. */
-static int count_bb_insns PARAMS ((basic_block));
-static rtx first_active_insn PARAMS ((basic_block));
-static rtx last_active_insn PARAMS ((basic_block, int));
-static int seq_contains_jump PARAMS ((rtx));
-static basic_block block_fallthru PARAMS ((basic_block));
-static int cond_exec_process_insns PARAMS ((ce_if_block_t *,
- rtx, rtx, rtx, rtx, int));
-static rtx cond_exec_get_condition PARAMS ((rtx));
-static int cond_exec_process_if_block PARAMS ((ce_if_block_t *, int));
-static rtx noce_get_condition PARAMS ((rtx, rtx *));
-static int noce_operand_ok PARAMS ((rtx));
-static int noce_process_if_block PARAMS ((ce_if_block_t *));
-static int process_if_block PARAMS ((ce_if_block_t *));
-static void merge_if_block PARAMS ((ce_if_block_t *));
-static int find_cond_trap PARAMS ((basic_block, edge, edge));
-static basic_block find_if_header PARAMS ((basic_block, int));
-static int block_jumps_and_fallthru_p PARAMS ((basic_block, basic_block));
-static int find_if_block PARAMS ((ce_if_block_t *));
-static int find_if_case_1 PARAMS ((basic_block, edge, edge));
-static int find_if_case_2 PARAMS ((basic_block, edge, edge));
-static int find_memory PARAMS ((rtx *, void *));
-static int dead_or_predicable PARAMS ((basic_block, basic_block,
- basic_block, basic_block, int));
-static void noce_emit_move_insn PARAMS ((rtx, rtx));
-static rtx block_has_only_trap PARAMS ((basic_block));
+static int count_bb_insns (basic_block);
+static rtx first_active_insn (basic_block);
+static rtx last_active_insn (basic_block, int);
+static int seq_contains_jump (rtx);
+static basic_block block_fallthru (basic_block);
+static int cond_exec_process_insns (ce_if_block_t *, rtx, rtx, rtx, rtx, int);
+static rtx cond_exec_get_condition (rtx);
+static int cond_exec_process_if_block (ce_if_block_t *, int);
+static rtx noce_get_condition (rtx, rtx *);
+static int noce_operand_ok (rtx);
+static int noce_process_if_block (ce_if_block_t *);
+static int process_if_block (ce_if_block_t *);
+static void merge_if_block (ce_if_block_t *);
+static int find_cond_trap (basic_block, edge, edge);
+static basic_block find_if_header (basic_block, int);
+static int block_jumps_and_fallthru_p (basic_block, basic_block);
+static int find_if_block (ce_if_block_t *);
+static int find_if_case_1 (basic_block, edge, edge);
+static int find_if_case_2 (basic_block, edge, edge);
+static int find_memory (rtx *, void *);
+static int dead_or_predicable (basic_block, basic_block, basic_block,
+ basic_block, int);
+static void noce_emit_move_insn (rtx, rtx);
+static rtx block_has_only_trap (basic_block);
+static void mark_loop_exit_edges (void);
\f
+/* Sets EDGE_LOOP_EXIT flag for all loop exits. */
+static void
+mark_loop_exit_edges ()
+{
+ struct loops loops;
+ basic_block bb;
+ edge e;
+
+ flow_loops_find (&loops, LOOP_TREE);
+
+ if (loops.num > 1)
+ {
+ FOR_EACH_BB (bb)
+ {
+ for (e = bb->succ; e; e = e->succ_next)
+ {
+ if (find_common_loop (bb->loop_father, e->dest->loop_father)
+ != bb->loop_father)
+ e->flags |= EDGE_LOOP_EXIT;
+ else
+ e->flags &= ~EDGE_LOOP_EXIT;
+ }
+ }
+ }
+
+ flow_loops_free (&loops);
+}
+
/* Count the number of non-jump active insns in BB. */
static int
-count_bb_insns (bb)
- basic_block bb;
+count_bb_insns (basic_block bb)
{
int count = 0;
rtx insn = bb->head;
/* Return the first non-jump active insn in the basic block. */
static rtx
-first_active_insn (bb)
- basic_block bb;
+first_active_insn (basic_block bb)
{
rtx insn = bb->head;
/* Return the last non-jump active (non-jump) insn in the basic block. */
static rtx
-last_active_insn (bb, skip_use_p)
- basic_block bb;
- int skip_use_p;
+last_active_insn (basic_block bb, int skip_use_p)
{
rtx insn = bb->end;
rtx head = bb->head;
return insn;
}
-/* It is possible, especially when having dealt with multi-word
+/* It is possible, especially when having dealt with multi-word
arithmetic, for the expanders to have emitted jumps. Search
through the sequence and return TRUE if a jump exists so that
we can abort the conversion. */
static int
-seq_contains_jump (insn)
- rtx insn;
+seq_contains_jump (rtx insn)
{
while (insn)
{
}
static basic_block
-block_fallthru (bb)
- basic_block bb;
+block_fallthru (basic_block bb)
{
edge e;
insns were processed. */
static int
-cond_exec_process_insns (ce_info, start, end, test, prob_val, mod_ok)
- ce_if_block_t *ce_info ATTRIBUTE_UNUSED; /* if block information */
- rtx start; /* first insn to look at */
- rtx end; /* last insn to look at */
- rtx test; /* conditional execution test */
- rtx prob_val; /* probability of branch taken. */
- int mod_ok; /* true if modifications ok last insn. */
+cond_exec_process_insns (ce_if_block_t *ce_info ATTRIBUTE_UNUSED,
+ /* if block information */rtx start,
+ /* first insn to look at */rtx end,
+ /* last insn to look at */rtx test,
+ /* conditional execution test */rtx prob_val,
+ /* probability of branch taken. */int mod_ok)
{
int must_be_last = FALSE;
rtx insn;
/* Remove USE insns that get in the way. */
if (reload_completed && GET_CODE (PATTERN (insn)) == USE)
{
- /* ??? Ug. Actually unlinking the thing is problematic,
+ /* ??? Ug. Actually unlinking the thing is problematic,
given what we'd have to coordinate with our callers. */
PUT_CODE (insn, NOTE);
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
/* Return the condition for a jump. Do not do any special processing. */
static rtx
-cond_exec_get_condition (jump)
- rtx jump;
+cond_exec_get_condition (rtx jump)
{
rtx test_if, cond;
converting the block. */
static int
-cond_exec_process_if_block (ce_info, do_multiple_p)
- ce_if_block_t * ce_info; /* if block information */
- int do_multiple_p; /* != 0 if we should handle && and || blocks */
+cond_exec_process_if_block (ce_if_block_t * ce_info,
+ /* if block information */int do_multiple_p)
{
basic_block test_bb = ce_info->test_bb; /* last test block */
basic_block then_bb = ce_info->then_bb; /* THEN */
/* Map test_expr/test_jump into the appropriate MD tests to use on
the conditionally executed code. */
-
+
true_expr = test_expr;
false_code = reversed_comparison_code (true_expr, test_bb->end);
return FALSE;
}
\f
-/* Used by noce_process_if_block to communicate with its subroutines.
+/* Used by noce_process_if_block to communicate with its subroutines.
The subroutines know that A and B may be evaluated freely. They
- know that X is a register. They should insert new instructions
+ know that X is a register. They should insert new instructions
before cond_earliest. */
struct noce_if_info
rtx jump, cond, cond_earliest;
};
-static rtx noce_emit_store_flag PARAMS ((struct noce_if_info *,
- rtx, int, int));
-static int noce_try_store_flag PARAMS ((struct noce_if_info *));
-static int noce_try_addcc PARAMS ((struct noce_if_info *));
-static int noce_try_store_flag_constants PARAMS ((struct noce_if_info *));
-static int noce_try_store_flag_mask PARAMS ((struct noce_if_info *));
-static rtx noce_emit_cmove PARAMS ((struct noce_if_info *,
- rtx, enum rtx_code, rtx,
- rtx, rtx, rtx));
-static int noce_try_cmove PARAMS ((struct noce_if_info *));
-static int noce_try_cmove_arith PARAMS ((struct noce_if_info *));
-static rtx noce_get_alt_condition PARAMS ((struct noce_if_info *,
- rtx, rtx *));
-static int noce_try_minmax PARAMS ((struct noce_if_info *));
-static int noce_try_abs PARAMS ((struct noce_if_info *));
+static rtx noce_emit_store_flag (struct noce_if_info *, rtx, int, int);
+static int noce_try_store_flag (struct noce_if_info *);
+static int noce_try_addcc (struct noce_if_info *);
+static int noce_try_store_flag_constants (struct noce_if_info *);
+static int noce_try_store_flag_mask (struct noce_if_info *);
+static rtx noce_emit_cmove (struct noce_if_info *, rtx, enum rtx_code, rtx,
+ rtx, rtx, rtx);
+static int noce_try_cmove (struct noce_if_info *);
+static int noce_try_cmove_arith (struct noce_if_info *);
+static rtx noce_get_alt_condition (struct noce_if_info *, rtx, rtx *);
+static int noce_try_minmax (struct noce_if_info *);
+static int noce_try_abs (struct noce_if_info *);
/* Helper function for noce_try_store_flag*. */
static rtx
-noce_emit_store_flag (if_info, x, reversep, normalize)
- struct noce_if_info *if_info;
- rtx x;
- int reversep, normalize;
+noce_emit_store_flag (struct noce_if_info *if_info, rtx x, int reversep,
+ int normalize)
{
rtx cond = if_info->cond;
int cond_complex;
/* Emit instruction to move an rtx into STRICT_LOW_PART. */
static void
-noce_emit_move_insn (x, y)
- rtx x, y;
+noce_emit_move_insn (rtx x, rtx y)
{
enum machine_mode outmode, inmode;
rtx outer, inner;
a go at the conversion. */
static int
-noce_try_store_flag (if_info)
- struct noce_if_info *if_info;
+noce_try_store_flag (struct noce_if_info *if_info)
{
int reversep;
rtx target, seq;
/* Convert "if (test) x = a; else x = b", for A and B constant. */
static int
-noce_try_store_flag_constants (if_info)
- struct noce_if_info *if_info;
+noce_try_store_flag_constants (struct noce_if_info *if_info)
{
rtx target, seq;
int reversep;
return FALSE;
if (reversep)
- {
+ {
tmp = itrue; itrue = ifalse; ifalse = tmp;
diff = trunc_int_for_mode (-diff, mode);
}
return FALSE;
}
-/* Convert "if (test) foo++" into "foo += (test != 0)", and
+/* Convert "if (test) foo++" into "foo += (test != 0)", and
similarly for "foo--". */
static int
-noce_try_addcc (if_info)
- struct noce_if_info *if_info;
+noce_try_addcc (struct noce_if_info *if_info)
{
rtx target, seq;
int subtract, normalize;
}
end_sequence ();
}
-
+
/* If that fails, construct conditional increment or decrement using
setcc. */
if (BRANCH_COST >= 2
/* Convert "if (test) x = 0;" to "x &= -(test == 0);" */
static int
-noce_try_store_flag_mask (if_info)
- struct noce_if_info *if_info;
+noce_try_store_flag_mask (struct noce_if_info *if_info)
{
rtx target, seq;
int reversep;
/* Helper function for noce_try_cmove and noce_try_cmove_arith. */
static rtx
-noce_emit_cmove (if_info, x, code, cmp_a, cmp_b, vfalse, vtrue)
- struct noce_if_info *if_info;
- rtx x, cmp_a, cmp_b, vfalse, vtrue;
- enum rtx_code code;
+noce_emit_cmove (struct noce_if_info *if_info, rtx x, enum rtx_code code,
+ rtx cmp_a, rtx cmp_b, rtx vfalse, rtx vtrue)
{
/* If earliest == jump, try to build the cmove insn directly.
This is helpful when combine has created some complex condition
#else
/* We'll never get here, as noce_process_if_block doesn't call the
functions involved. Ifdef code, however, should be discouraged
- because it leads to typos in the code not selected. However,
+ because it leads to typos in the code not selected. However,
emit_conditional_move won't exist either. */
return NULL_RTX;
#endif
has had a go at it. */
static int
-noce_try_cmove (if_info)
- struct noce_if_info *if_info;
+noce_try_cmove (struct noce_if_info *if_info)
{
enum rtx_code code;
rtx target, seq;
/* Try more complex cases involving conditional_move. */
static int
-noce_try_cmove_arith (if_info)
- struct noce_if_info *if_info;
+noce_try_cmove_arith (struct noce_if_info *if_info)
{
rtx a = if_info->a;
rtx b = if_info->b;
if (test)
x = y;
*/
-
+
code = GET_CODE (if_info->cond);
insn_a = if_info->insn_a;
insn_b = if_info->insn_b;
/* If either operand is complex, load it into a register first.
The best way to do this is to copy the original insn. In this
- way we preserve any clobbers etc that the insn may have had.
+ way we preserve any clobbers etc that the insn may have had.
This is of course not possible in the IS_MEM case. */
if (! general_operand (a, GET_MODE (a)))
{
For these we wish to know that it is A or B in the condition. */
static rtx
-noce_get_alt_condition (if_info, target, earliest)
- struct noce_if_info *if_info;
- rtx target;
- rtx *earliest;
+noce_get_alt_condition (struct noce_if_info *if_info, rtx target,
+ rtx *earliest)
{
rtx cond, set, insn;
int reverse;
}
cond = canonicalize_condition (if_info->jump, cond, reverse,
- earliest, target);
+ earliest, target, false);
if (! cond || ! reg_mentioned_p (target, cond))
return NULL;
/* Convert "if (a < b) x = a; else x = b;" to "x = min(a, b);", etc. */
static int
-noce_try_minmax (if_info)
- struct noce_if_info *if_info;
-{
+noce_try_minmax (struct noce_if_info *if_info)
+{
rtx cond, earliest, target, seq;
enum rtx_code code, op;
int unsignedp;
noce_emit_move_insn (if_info->x, target);
seq = get_insns ();
- end_sequence ();
+ end_sequence ();
if (seq_contains_jump (seq))
return FALSE;
/* Convert "if (a < 0) x = -a; else x = a;" to "x = abs(a);", etc. */
static int
-noce_try_abs (if_info)
- struct noce_if_info *if_info;
-{
+noce_try_abs (struct noce_if_info *if_info)
+{
rtx cond, earliest, target, seq, a, b, c;
int negate;
}
else
return FALSE;
-
+
cond = noce_get_alt_condition (if_info, b, &earliest);
if (!cond)
return FALSE;
for (insn = earliest;
insn != if_info->test_bb->head;
insn = PREV_INSN (insn))
- if (INSN_P (insn)
+ if (INSN_P (insn)
&& ((note = find_reg_note (insn, REG_EQUAL, c))
|| (note = find_reg_note (insn, REG_EQUIV, c))))
break;
c = get_pool_constant (XEXP (c, 0));
/* Work around funny ideas get_condition has wrt canonicalization.
- Note that these rtx constants are known to be CONST_INT, and
+ Note that these rtx constants are known to be CONST_INT, and
therefore imply integer comparisons. */
if (c == constm1_rtx && GET_CODE (cond) == GT)
;
noce_emit_move_insn (if_info->x, target);
seq = get_insns ();
- end_sequence ();
+ end_sequence ();
if (seq_contains_jump (seq))
return FALSE;
valid at JUMP, instead of at EARLIEST. */
static rtx
-noce_get_condition (jump, earliest)
- rtx jump;
- rtx *earliest;
+noce_get_condition (rtx jump, rtx *earliest)
{
rtx cond, set, tmp, insn;
bool reverse;
/* Otherwise, fall back on canonicalize_condition to do the dirty
work of manipulating MODE_CC values and COMPARE rtx codes. */
- tmp = canonicalize_condition (jump, cond, reverse, earliest, NULL_RTX);
+ tmp = canonicalize_condition (jump, cond, reverse, earliest, NULL_RTX,
+ false);
if (!tmp)
return NULL_RTX;
tmp = XEXP (tmp, 0);
if (!REG_P (tmp) || GET_MODE_CLASS (GET_MODE (tmp)) != MODE_INT)
return NULL_RTX;
- tmp = canonicalize_condition (jump, cond, reverse, earliest, tmp);
+ tmp = canonicalize_condition (jump, cond, reverse, earliest, tmp,
+ false);
if (!tmp)
return NULL_RTX;
/* Return true if OP is ok for if-then-else processing. */
static int
-noce_operand_ok (op)
- rtx op;
+noce_operand_ok (rtx op)
{
/* We special-case memories, so handle any of them with
no address side effects. */
successful at converting the block. */
static int
-noce_process_if_block (ce_info)
- struct ce_if_block * ce_info;
+noce_process_if_block (struct ce_if_block * ce_info)
{
basic_block test_bb = ce_info->test_bb; /* test block */
basic_block then_bb = ce_info->then_bb; /* THEN */
/* If x has side effects then only the if-then-else form is safe to
convert. But even in that case we would need to restore any notes
- (such as REG_INC) at then end. That can be tricky if
+ (such as REG_INC) at then end. That can be tricky if
noce_emit_move_insn expands to more than one insn, so disable the
optimization entirely for now if there are side effects. */
if (side_effects_p (x))
x must be executed twice. */
else if (insn_b && side_effects_p (orig_x))
return FALSE;
-
+
x = orig_x;
goto success;
}
straight line code. Return true if successful. */
static int
-process_if_block (ce_info)
- struct ce_if_block * ce_info;
+process_if_block (struct ce_if_block * ce_info)
{
if (! reload_completed
&& noce_process_if_block (ce_info))
/* Merge the blocks and mark for local life update. */
static void
-merge_if_block (ce_info)
- struct ce_if_block * ce_info;
+merge_if_block (struct ce_if_block * ce_info)
{
basic_block test_bb = ce_info->test_bb; /* last test block */
basic_block then_bb = ce_info->then_bb; /* THEN */
basic_block bb = test_bb;
basic_block last_test_bb = ce_info->last_test_bb;
basic_block fallthru = block_fallthru (bb);
-
+
do
{
bb = fallthru;
fallthru = block_fallthru (bb);
if (post_dominators)
delete_from_dominance_info (post_dominators, bb);
- merge_blocks_nomove (combo_bb, bb);
+ merge_blocks (combo_bb, bb);
num_removed_blocks++;
}
while (bb != last_test_bb);
then_bb->global_live_at_end);
if (post_dominators)
delete_from_dominance_info (post_dominators, then_bb);
- merge_blocks_nomove (combo_bb, then_bb);
+ merge_blocks (combo_bb, then_bb);
num_removed_blocks++;
}
{
if (post_dominators)
delete_from_dominance_info (post_dominators, else_bb);
- merge_blocks_nomove (combo_bb, else_bb);
+ merge_blocks (combo_bb, else_bb);
num_removed_blocks++;
}
Since we've already merged the TEST, THEN and ELSE blocks, we should
have only one remaining edge from our if-then-else diamond. If there
is more than one remaining edge, it must come from elsewhere. There
- may be zero incoming edges if the THEN block didn't actually join
+ may be zero incoming edges if the THEN block didn't actually join
back up (as with a call to abort). */
else if ((join_bb->pred == NULL
|| join_bb->pred->pred_next == NULL)
if (post_dominators)
delete_from_dominance_info (post_dominators, join_bb);
- merge_blocks_nomove (combo_bb, join_bb);
+ merge_blocks (combo_bb, join_bb);
num_removed_blocks++;
}
else
first block if some transformation was done. Return NULL otherwise. */
static basic_block
-find_if_header (test_bb, pass)
- basic_block test_bb;
- int pass;
+find_if_header (basic_block test_bb, int pass)
{
ce_if_block_t ce_info;
edge then_edge;
|| (else_edge->flags & EDGE_COMPLEX))
return NULL;
+ /* Nor exit the loop. */
+ if ((then_edge->flags & EDGE_LOOP_EXIT)
+ || (else_edge->flags & EDGE_LOOP_EXIT))
+ return NULL;
+
/* The THEN edge is canonically the one that falls through. */
if (then_edge->flags & EDGE_FALLTHRU)
;
of non-note, non-jump, non-USE/CLOBBER insns in the block. */
static int
-block_jumps_and_fallthru_p (cur_bb, target_bb)
- basic_block cur_bb;
- basic_block target_bb;
+block_jumps_and_fallthru_p (basic_block cur_bb, basic_block target_bb)
{
edge cur_edge;
int fallthru_p = FALSE;
Return TRUE if we were successful at converting the block. */
static int
-find_if_block (ce_info)
- struct ce_if_block * ce_info;
+find_if_block (struct ce_if_block * ce_info)
{
basic_block test_bb = ce_info->test_bb;
basic_block then_bb = ce_info->then_bb;
}
else if ((n_insns = block_jumps_and_fallthru_p (bb, then_bb)) >= 0)
{
- ce_info->and_and_p = FALSE;
+ ce_info->and_and_p = FALSE;
target_bb = then_bb;
}
else
/* Otherwise it is not an IF-THEN or IF-THEN-ELSE combination. */
else
- return FALSE;
+ return FALSE;
num_possible_if_blocks++;
to a trap, into a conditional trap. */
static int
-find_cond_trap (test_bb, then_edge, else_edge)
- basic_block test_bb;
- edge then_edge, else_edge;
+find_cond_trap (basic_block test_bb, edge then_edge, edge else_edge)
{
basic_block then_bb = then_edge->dest;
basic_block else_bb = else_edge->dest;
return TRUE;
}
-/* Subroutine of find_cond_trap: if BB contains only a trap insn,
+/* Subroutine of find_cond_trap: if BB contains only a trap insn,
return it. */
static rtx
-block_has_only_trap (bb)
- basic_block bb;
+block_has_only_trap (basic_block bb)
{
rtx trap;
/* Tests for case 1 above. */
static int
-find_if_case_1 (test_bb, then_edge, else_edge)
- basic_block test_bb;
- edge then_edge, else_edge;
+find_if_case_1 (basic_block test_bb, edge then_edge, edge else_edge)
{
basic_block then_bb = then_edge->dest;
basic_block else_bb = else_edge->dest, new_bb;
return FALSE;
/* Registers set are dead, or are predicable. */
- if (! dead_or_predicable (test_bb, then_bb, else_bb,
+ if (! dead_or_predicable (test_bb, then_bb, else_bb,
then_bb->succ->dest, 1))
return FALSE;
bitmap_operation (test_bb->global_live_at_end,
else_bb->global_live_at_start,
then_bb->global_live_at_end, BITMAP_IOR);
-
+
new_bb = redirect_edge_and_branch_force (FALLTHRU_EDGE (test_bb), else_bb);
then_bb_index = then_bb->index;
if (post_dominators)
/* Test for case 2 above. */
static int
-find_if_case_2 (test_bb, then_edge, else_edge)
- basic_block test_bb;
- edge then_edge, else_edge;
+find_if_case_2 (basic_block test_bb, edge then_edge, edge else_edge)
{
basic_block then_bb = then_edge->dest;
basic_block else_bb = else_edge->dest;
if (note && INTVAL (XEXP (note, 0)) >= REG_BR_PROB_BASE / 2)
;
else if (else_succ->dest->index < 0
- || dominated_by_p (post_dominators, then_bb,
+ || dominated_by_p (post_dominators, then_bb,
else_succ->dest))
;
else
bitmap_operation (test_bb->global_live_at_end,
then_bb->global_live_at_start,
else_bb->global_live_at_end, BITMAP_IOR);
-
+
if (post_dominators)
delete_from_dominance_info (post_dominators, else_bb);
delete_block (else_bb);
Return 1 if a memory is found. */
static int
-find_memory (px, data)
- rtx *px;
- void *data ATTRIBUTE_UNUSED;
+find_memory (rtx *px, void *data ATTRIBUTE_UNUSED)
{
return GET_CODE (*px) == MEM;
}
REVERSEP is true if the sense of the branch should be reversed. */
static int
-dead_or_predicable (test_bb, merge_bb, other_bb, new_dest, reversep)
- basic_block test_bb, merge_bb, other_bb;
- basic_block new_dest;
- int reversep;
+dead_or_predicable (basic_block test_bb, basic_block merge_bb,
+ basic_block other_bb, basic_block new_dest, int reversep)
{
rtx head, end, jump, earliest, old_dest, new_label = NULL_RTX;
test_set = INITIALIZE_REG_SET (test_set_head);
/* ??? bb->local_set is only valid during calculate_global_regs_live,
- so we must recompute usage for MERGE_BB. Not so bad, I suppose,
+ so we must recompute usage for MERGE_BB. Not so bad, I suppose,
since we've already asserted that MERGE_BB is small. */
propagate_block (merge_bb, tmp, merge_set, merge_set, 0);
/* Main entry point for all if-conversion. */
void
-if_convert (x_life_data_ok)
- int x_life_data_ok;
+if_convert (int x_life_data_ok)
{
basic_block bb;
int pass;
num_removed_blocks = 0;
life_data_ok = (x_life_data_ok != 0);
+ if (! (* targetm.cannot_modify_jumps_p) ())
+ mark_loop_exit_edges ();
+
/* Free up basic_block_for_insn so that we don't have to keep it
- up to date, either here or in merge_blocks_nomove. */
+ up to date, either here or in merge_blocks. */
free_basic_block_vars (1);
/* Compute postdominators if we think we'll use them. */
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