/* Generic partial redundancy elimination with lazy code motion support.
- Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GCC.
#include "basic-block.h"
#include "output.h"
#include "tm_p.h"
+#include "function.h"
/* We want target macros for the mode switching code to be able to refer
to instruction attribute values. */
#include "insn-attr.h"
/* Edge based LCM routines. */
-static void compute_antinout_edge PARAMS ((sbitmap *, sbitmap *,
- sbitmap *, sbitmap *));
-static void compute_earliest PARAMS ((struct edge_list *, int,
- sbitmap *, sbitmap *,
- sbitmap *, sbitmap *,
- sbitmap *));
-static void compute_laterin PARAMS ((struct edge_list *, sbitmap *,
- sbitmap *, sbitmap *,
- sbitmap *));
-static void compute_insert_delete PARAMS ((struct edge_list *edge_list,
- sbitmap *, sbitmap *,
- sbitmap *, sbitmap *,
- sbitmap *));
+static void compute_antinout_edge (sbitmap *, sbitmap *, sbitmap *, sbitmap *);
+static void compute_earliest (struct edge_list *, int, sbitmap *, sbitmap *,
+ sbitmap *, sbitmap *, sbitmap *);
+static void compute_laterin (struct edge_list *, sbitmap *, sbitmap *,
+ sbitmap *, sbitmap *);
+static void compute_insert_delete (struct edge_list *edge_list, sbitmap *,
+ sbitmap *, sbitmap *, sbitmap *, sbitmap *);
/* Edge based LCM routines on a reverse flowgraph. */
-static void compute_farthest PARAMS ((struct edge_list *, int,
- sbitmap *, sbitmap *,
- sbitmap*, sbitmap *,
- sbitmap *));
-static void compute_nearerout PARAMS ((struct edge_list *, sbitmap *,
- sbitmap *, sbitmap *,
- sbitmap *));
-static void compute_rev_insert_delete PARAMS ((struct edge_list *edge_list,
- sbitmap *, sbitmap *,
- sbitmap *, sbitmap *,
- sbitmap *));
+static void compute_farthest (struct edge_list *, int, sbitmap *, sbitmap *,
+ sbitmap*, sbitmap *, sbitmap *);
+static void compute_nearerout (struct edge_list *, sbitmap *, sbitmap *,
+ sbitmap *, sbitmap *);
+static void compute_rev_insert_delete (struct edge_list *edge_list, sbitmap *,
+ sbitmap *, sbitmap *, sbitmap *,
+ sbitmap *);
\f
/* Edge based lcm routines. */
Other than that, its pretty much identical to compute_antinout. */
static void
-compute_antinout_edge (antloc, transp, antin, antout)
- sbitmap *antloc;
- sbitmap *transp;
- sbitmap *antin;
- sbitmap *antout;
+compute_antinout_edge (sbitmap *antloc, sbitmap *transp, sbitmap *antin,
+ sbitmap *antout)
{
basic_block bb;
edge e;
basic_block *worklist, *qin, *qout, *qend;
unsigned int qlen;
+ edge_iterator ei;
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
- qin = qout = worklist
- = (basic_block *) xmalloc (sizeof (basic_block) * n_basic_blocks);
+ qin = qout = worklist = xmalloc (sizeof (basic_block) * n_basic_blocks);
/* We want a maximal solution, so make an optimistic initialization of
ANTIN. */
optimistic initialization of ANTIN above. */
FOR_EACH_BB_REVERSE (bb)
{
- *qin++ =bb;
+ *qin++ = bb;
bb->aux = bb;
}
/* Mark blocks which are predecessors of the exit block so that we
can easily identify them below. */
- for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
e->src->aux = EXIT_BLOCK_PTR;
/* Iterate until the worklist is empty. */
/* If the in state of this block changed, then we need
to add the predecessors of this block to the worklist
if they are not already on the worklist. */
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
if (!e->src->aux && e->src != ENTRY_BLOCK_PTR)
{
*qin++ = e->src;
/* Compute the earliest vector for edge based lcm. */
static void
-compute_earliest (edge_list, n_exprs, antin, antout, avout, kill, earliest)
- struct edge_list *edge_list;
- int n_exprs;
- sbitmap *antin, *antout, *avout, *kill, *earliest;
+compute_earliest (struct edge_list *edge_list, int n_exprs, sbitmap *antin,
+ sbitmap *antout, sbitmap *avout, sbitmap *kill,
+ sbitmap *earliest)
{
sbitmap difference, temp_bitmap;
int x, num_edges;
to compute it. */
static void
-compute_laterin (edge_list, earliest, antloc, later, laterin)
- struct edge_list *edge_list;
- sbitmap *earliest, *antloc, *later, *laterin;
+compute_laterin (struct edge_list *edge_list, sbitmap *earliest,
+ sbitmap *antloc, sbitmap *later, sbitmap *laterin)
{
int num_edges, i;
edge e;
basic_block *worklist, *qin, *qout, *qend, bb;
unsigned int qlen;
+ edge_iterator ei;
num_edges = NUM_EDGES (edge_list);
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
qin = qout = worklist
- = (basic_block *) xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
+ = xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
/* Initialize a mapping from each edge to its index. */
for (i = 0; i < num_edges; i++)
do not want to be overly optimistic. Consider an outgoing edge from
the entry block. That edge should always have a LATER value the
same as EARLIEST for that edge. */
- for (e = ENTRY_BLOCK_PTR->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
sbitmap_copy (later[(size_t) e->aux], earliest[(size_t) e->aux]);
/* Add all the blocks to the worklist. This prevents an early exit from
*qin++ = bb;
bb->aux = bb;
}
- qin = worklist;
+
/* Note that we do not use the last allocated element for our queue,
as EXIT_BLOCK is never inserted into it. In fact the above allocation
- of n_basic_blocks + 1 elements is not encessary. */
+ of n_basic_blocks + 1 elements is not necessary. */
+ qin = worklist;
qend = &worklist[n_basic_blocks];
qlen = n_basic_blocks;
/* Compute the intersection of LATERIN for each incoming edge to B. */
sbitmap_ones (laterin[bb->index]);
- for (e = bb->pred; e != NULL; e = e->pred_next)
- sbitmap_a_and_b (laterin[bb->index], laterin[bb->index], later[(size_t)e->aux]);
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ sbitmap_a_and_b (laterin[bb->index], laterin[bb->index],
+ later[(size_t)e->aux]);
/* Calculate LATER for all outgoing edges. */
- for (e = bb->succ; e != NULL; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (sbitmap_union_of_diff_cg (later[(size_t) e->aux],
earliest[(size_t) e->aux],
laterin[e->src->index],
for the EXIT block. We allocated an extra entry in the LATERIN array
for just this purpose. */
sbitmap_ones (laterin[last_basic_block]);
- for (e = EXIT_BLOCK_PTR->pred; e != NULL; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
sbitmap_a_and_b (laterin[last_basic_block],
laterin[last_basic_block],
later[(size_t) e->aux]);
/* Compute the insertion and deletion points for edge based LCM. */
static void
-compute_insert_delete (edge_list, antloc, later, laterin,
- insert, delete)
- struct edge_list *edge_list;
- sbitmap *antloc, *later, *laterin, *insert, *delete;
+compute_insert_delete (struct edge_list *edge_list, sbitmap *antloc,
+ sbitmap *later, sbitmap *laterin, sbitmap *insert,
+ sbitmap *delete)
{
int x;
basic_block bb;
FOR_EACH_BB (bb)
- sbitmap_difference (delete[bb->index], antloc[bb->index], laterin[bb->index]);
+ sbitmap_difference (delete[bb->index], antloc[bb->index],
+ laterin[bb->index]);
for (x = 0; x < NUM_EDGES (edge_list); x++)
{
map the insert vector to what edge an expression should be inserted on. */
struct edge_list *
-pre_edge_lcm (file, n_exprs, transp, avloc, antloc, kill, insert, delete)
- FILE *file ATTRIBUTE_UNUSED;
- int n_exprs;
- sbitmap *transp;
- sbitmap *avloc;
- sbitmap *antloc;
- sbitmap *kill;
- sbitmap **insert;
- sbitmap **delete;
+pre_edge_lcm (FILE *file ATTRIBUTE_UNUSED, int n_exprs, sbitmap *transp,
+ sbitmap *avloc, sbitmap *antloc, sbitmap *kill,
+ sbitmap **insert, sbitmap **delete)
{
sbitmap *antin, *antout, *earliest;
sbitmap *avin, *avout;
Return the number of passes we performed to iterate to a solution. */
void
-compute_available (avloc, kill, avout, avin)
- sbitmap *avloc, *kill, *avout, *avin;
+compute_available (sbitmap *avloc, sbitmap *kill, sbitmap *avout,
+ sbitmap *avin)
{
edge e;
basic_block *worklist, *qin, *qout, *qend, bb;
unsigned int qlen;
+ edge_iterator ei;
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
- qin = qout = worklist
- = (basic_block *) xmalloc (sizeof (basic_block) * n_basic_blocks);
+ qin = qout = worklist = xmalloc (sizeof (basic_block) * n_basic_blocks);
/* We want a maximal solution. */
sbitmap_vector_ones (avout, last_basic_block);
/* Mark blocks which are successors of the entry block so that we
can easily identify them below. */
- for (e = ENTRY_BLOCK_PTR->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
e->dest->aux = ENTRY_BLOCK_PTR;
/* Iterate until the worklist is empty. */
sbitmap_intersection_of_preds (avin[bb->index], avout, bb->index);
}
- if (sbitmap_union_of_diff_cg (avout[bb->index], avloc[bb->index], avin[bb->index], kill[bb->index]))
+ if (sbitmap_union_of_diff_cg (avout[bb->index], avloc[bb->index],
+ avin[bb->index], kill[bb->index]))
/* If the out state of this block changed, then we need
to add the successors of this block to the worklist
if they are not already on the worklist. */
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (!e->dest->aux && e->dest != EXIT_BLOCK_PTR)
{
*qin++ = e->dest;
/* Compute the farthest vector for edge based lcm. */
static void
-compute_farthest (edge_list, n_exprs, st_avout, st_avin, st_antin,
- kill, farthest)
- struct edge_list *edge_list;
- int n_exprs;
- sbitmap *st_avout, *st_avin, *st_antin, *kill, *farthest;
+compute_farthest (struct edge_list *edge_list, int n_exprs,
+ sbitmap *st_avout, sbitmap *st_avin, sbitmap *st_antin,
+ sbitmap *kill, sbitmap *farthest)
{
sbitmap difference, temp_bitmap;
int x, num_edges;
implementation can be found before compute_laterin. */
static void
-compute_nearerout (edge_list, farthest, st_avloc, nearer, nearerout)
- struct edge_list *edge_list;
- sbitmap *farthest, *st_avloc, *nearer, *nearerout;
+compute_nearerout (struct edge_list *edge_list, sbitmap *farthest,
+ sbitmap *st_avloc, sbitmap *nearer, sbitmap *nearerout)
{
int num_edges, i;
edge e;
basic_block *worklist, *tos, bb;
+ edge_iterator ei;
num_edges = NUM_EDGES (edge_list);
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
- tos = worklist
- = (basic_block *) xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
+ tos = worklist = xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
/* Initialize NEARER for each edge and build a mapping from an edge to
its index. */
do not want to be overly optimistic. Consider an incoming edge to
the exit block. That edge should always have a NEARER value the
same as FARTHEST for that edge. */
- for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
sbitmap_copy (nearer[(size_t)e->aux], farthest[(size_t)e->aux]);
/* Add all the blocks to the worklist. This prevents an early exit
/* Compute the intersection of NEARER for each outgoing edge from B. */
sbitmap_ones (nearerout[bb->index]);
- for (e = bb->succ; e != NULL; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
sbitmap_a_and_b (nearerout[bb->index], nearerout[bb->index],
nearer[(size_t) e->aux]);
/* Calculate NEARER for all incoming edges. */
- for (e = bb->pred; e != NULL; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
if (sbitmap_union_of_diff_cg (nearer[(size_t) e->aux],
farthest[(size_t) e->aux],
nearerout[e->dest->index],
for the ENTRY block. We allocated an extra entry in the NEAREROUT array
for just this purpose. */
sbitmap_ones (nearerout[last_basic_block]);
- for (e = ENTRY_BLOCK_PTR->succ; e != NULL; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
sbitmap_a_and_b (nearerout[last_basic_block],
nearerout[last_basic_block],
nearer[(size_t) e->aux]);
/* Compute the insertion and deletion points for edge based LCM. */
static void
-compute_rev_insert_delete (edge_list, st_avloc, nearer, nearerout,
- insert, delete)
- struct edge_list *edge_list;
- sbitmap *st_avloc, *nearer, *nearerout, *insert, *delete;
+compute_rev_insert_delete (struct edge_list *edge_list, sbitmap *st_avloc,
+ sbitmap *nearer, sbitmap *nearerout,
+ sbitmap *insert, sbitmap *delete)
{
int x;
basic_block bb;
FOR_EACH_BB (bb)
- sbitmap_difference (delete[bb->index], st_avloc[bb->index], nearerout[bb->index]);
+ sbitmap_difference (delete[bb->index], st_avloc[bb->index],
+ nearerout[bb->index]);
for (x = 0; x < NUM_EDGES (edge_list); x++)
{
an expression should be inserted on. */
struct edge_list *
-pre_edge_rev_lcm (file, n_exprs, transp, st_avloc, st_antloc, kill,
- insert, delete)
- FILE *file ATTRIBUTE_UNUSED;
- int n_exprs;
- sbitmap *transp;
- sbitmap *st_avloc;
- sbitmap *st_antloc;
- sbitmap *kill;
- sbitmap **insert;
- sbitmap **delete;
+pre_edge_rev_lcm (FILE *file ATTRIBUTE_UNUSED, int n_exprs, sbitmap *transp,
+ sbitmap *st_avloc, sbitmap *st_antloc, sbitmap *kill,
+ sbitmap **insert, sbitmap **delete)
{
sbitmap *st_antin, *st_antout;
sbitmap *st_avout, *st_avin, *farthest;
edge_list = create_edge_list ();
num_edges = NUM_EDGES (edge_list);
- st_antin = (sbitmap *) sbitmap_vector_alloc (last_basic_block, n_exprs);
- st_antout = (sbitmap *) sbitmap_vector_alloc (last_basic_block, n_exprs);
+ st_antin = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ st_antout = sbitmap_vector_alloc (last_basic_block, n_exprs);
sbitmap_vector_zero (st_antin, last_basic_block);
sbitmap_vector_zero (st_antout, last_basic_block);
compute_antinout_edge (st_antloc, transp, st_antin, st_antout);
The LCM algorithm is then run over the flow graph to determine where to
place the sets to the highest-priority value in respect of first the first
- insn in any one block. Any adjustments required to the transparancy
+ insn in any one block. Any adjustments required to the transparency
vectors are made, then the next iteration starts for the next-lower
- priority mode, till for each entity all modes are exhasted.
+ priority mode, till for each entity all modes are exhausted.
More details are located in the code for optimize_mode_switching(). */
static sbitmap *antic;
static sbitmap *transp;
static sbitmap *comp;
-static sbitmap *delete;
-static sbitmap *insert;
-
-static struct seginfo * new_seginfo PARAMS ((int, rtx, int, HARD_REG_SET));
-static void add_seginfo PARAMS ((struct bb_info *, struct seginfo *));
-static void reg_dies PARAMS ((rtx, HARD_REG_SET));
-static void reg_becomes_live PARAMS ((rtx, rtx, void *));
-static void make_preds_opaque PARAMS ((basic_block, int));
+
+static struct seginfo * new_seginfo (int, rtx, int, HARD_REG_SET);
+static void add_seginfo (struct bb_info *, struct seginfo *);
+static void reg_dies (rtx, HARD_REG_SET);
+static void reg_becomes_live (rtx, rtx, void *);
+static void make_preds_opaque (basic_block, int);
#endif
\f
#ifdef OPTIMIZE_MODE_SWITCHING
with the MODE, INSN, and basic block BB parameters. */
static struct seginfo *
-new_seginfo (mode, insn, bb, regs_live)
- int mode;
- rtx insn;
- int bb;
- HARD_REG_SET regs_live;
+new_seginfo (int mode, rtx insn, int bb, HARD_REG_SET regs_live)
{
struct seginfo *ptr;
ptr = xmalloc (sizeof (struct seginfo));
INFO is the structure to be linked in. */
static void
-add_seginfo (head, info)
- struct bb_info *head;
- struct seginfo *info;
+add_seginfo (struct bb_info *head, struct seginfo *info)
{
struct seginfo *ptr;
we are currently handling mode-switching for. */
static void
-make_preds_opaque (b, j)
- basic_block b;
- int j;
+make_preds_opaque (basic_block b, int j)
{
edge e;
+ edge_iterator ei;
- for (e = b->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, b->preds)
{
basic_block pb = e->src;
/* Record in LIVE that register REG died. */
static void
-reg_dies (reg, live)
- rtx reg;
- HARD_REG_SET live;
+reg_dies (rtx reg, HARD_REG_SET live)
{
int regno, nregs;
- if (GET_CODE (reg) != REG)
+ if (!REG_P (reg))
return;
regno = REGNO (reg);
if (regno < FIRST_PSEUDO_REGISTER)
- for (nregs = HARD_REGNO_NREGS (regno, GET_MODE (reg)) - 1; nregs >= 0;
+ for (nregs = hard_regno_nregs[regno][GET_MODE (reg)] - 1; nregs >= 0;
nregs--)
CLEAR_HARD_REG_BIT (live, regno + nregs);
}
This is called via note_stores. */
static void
-reg_becomes_live (reg, setter, live)
- rtx reg;
- rtx setter ATTRIBUTE_UNUSED;
- void *live;
+reg_becomes_live (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *live)
{
int regno, nregs;
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
- if (GET_CODE (reg) != REG)
+ if (!REG_P (reg))
return;
regno = REGNO (reg);
if (regno < FIRST_PSEUDO_REGISTER)
- for (nregs = HARD_REGNO_NREGS (regno, GET_MODE (reg)) - 1; nregs >= 0;
+ for (nregs = hard_regno_nregs[regno][GET_MODE (reg)] - 1; nregs >= 0;
nregs--)
SET_HARD_REG_BIT (* (HARD_REG_SET *) live, regno + nregs);
}
+/* Make sure if MODE_ENTRY is defined the MODE_EXIT is defined
+ and vice versa. */
+#if defined (MODE_ENTRY) != defined (MODE_EXIT)
+ #error "Both MODE_ENTRY and MODE_EXIT must be defined"
+#endif
+
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
+/* Split the fallthrough edge to the exit block, so that we can note
+ that there NORMAL_MODE is required. Return the new block if it's
+ inserted before the exit block. Otherwise return null. */
+
+static basic_block
+create_pre_exit (int n_entities, int *entity_map, const int *num_modes)
+{
+ edge eg;
+ edge_iterator ei;
+ basic_block pre_exit;
+
+ /* The only non-call predecessor at this stage is a block with a
+ fallthrough edge; there can be at most one, but there could be
+ none at all, e.g. when exit is called. */
+ pre_exit = 0;
+ FOR_EACH_EDGE (eg, ei, EXIT_BLOCK_PTR->preds)
+ if (eg->flags & EDGE_FALLTHRU)
+ {
+ basic_block src_bb = eg->src;
+ regset live_at_end = src_bb->global_live_at_end;
+ rtx last_insn, ret_reg;
+
+ gcc_assert (!pre_exit);
+ /* If this function returns a value at the end, we have to
+ insert the final mode switch before the return value copy
+ to its hard register. */
+ if (EDGE_COUNT (EXIT_BLOCK_PTR->preds) == 1
+ && GET_CODE ((last_insn = BB_END (src_bb))) == INSN
+ && GET_CODE (PATTERN (last_insn)) == USE
+ && GET_CODE ((ret_reg = XEXP (PATTERN (last_insn), 0))) == REG)
+ {
+ int ret_start = REGNO (ret_reg);
+ int nregs = hard_regno_nregs[ret_start][GET_MODE (ret_reg)];
+ int ret_end = ret_start + nregs;
+ int short_block = 0;
+ int maybe_builtin_apply = 0;
+ int forced_late_switch = 0;
+ rtx before_return_copy;
+
+ do
+ {
+ rtx return_copy = PREV_INSN (last_insn);
+ rtx return_copy_pat, copy_reg;
+ int copy_start, copy_num;
+ int j;
+
+ if (INSN_P (return_copy))
+ {
+ if (GET_CODE (PATTERN (return_copy)) == USE
+ && GET_CODE (XEXP (PATTERN (return_copy), 0)) == REG
+ && (FUNCTION_VALUE_REGNO_P
+ (REGNO (XEXP (PATTERN (return_copy), 0)))))
+ {
+ maybe_builtin_apply = 1;
+ last_insn = return_copy;
+ continue;
+ }
+ /* If the return register is not (in its entirety)
+ likely spilled, the return copy might be
+ partially or completely optimized away. */
+ return_copy_pat = single_set (return_copy);
+ if (!return_copy_pat)
+ {
+ return_copy_pat = PATTERN (return_copy);
+ if (GET_CODE (return_copy_pat) != CLOBBER)
+ break;
+ }
+ copy_reg = SET_DEST (return_copy_pat);
+ if (GET_CODE (copy_reg) == REG)
+ copy_start = REGNO (copy_reg);
+ else if (GET_CODE (copy_reg) == SUBREG
+ && GET_CODE (SUBREG_REG (copy_reg)) == REG)
+ copy_start = REGNO (SUBREG_REG (copy_reg));
+ else
+ break;
+ if (copy_start >= FIRST_PSEUDO_REGISTER)
+ break;
+ copy_num
+ = hard_regno_nregs[copy_start][GET_MODE (copy_reg)];
+
+ /* If the return register is not likely spilled, - as is
+ the case for floating point on SH4 - then it might
+ be set by an arithmetic operation that needs a
+ different mode than the exit block. */
+ for (j = n_entities - 1; j >= 0; j--)
+ {
+ int e = entity_map[j];
+ int mode = MODE_NEEDED (e, return_copy);
+
+ if (mode != num_modes[e] && mode != MODE_EXIT (e))
+ break;
+ }
+ if (j >= 0)
+ {
+ /* For the SH4, floating point loads depend on fpscr,
+ thus we might need to put the final mode switch
+ after the return value copy. That is still OK,
+ because a floating point return value does not
+ conflict with address reloads. */
+ if (copy_start >= ret_start
+ && copy_start + copy_num <= ret_end
+ && OBJECT_P (SET_SRC (return_copy_pat)))
+ forced_late_switch = 1;
+ break;
+ }
+
+ if (copy_start >= ret_start
+ && copy_start + copy_num <= ret_end)
+ nregs -= copy_num;
+ else if (!maybe_builtin_apply
+ || !FUNCTION_VALUE_REGNO_P (copy_start))
+ break;
+ last_insn = return_copy;
+ }
+ /* ??? Exception handling can lead to the return value
+ copy being already separated from the return value use,
+ as in unwind-dw2.c .
+ Similarly, conditionally returning without a value,
+ and conditionally using builtin_return can lead to an
+ isolated use. */
+ if (return_copy == BB_HEAD (src_bb))
+ {
+ short_block = 1;
+ break;
+ }
+ last_insn = return_copy;
+ }
+ while (nregs);
+ /* If we didn't see a full return value copy, verify that there
+ is a plausible reason for this. If some, but not all of the
+ return register is likely spilled, we can expect that there
+ is a copy for the likely spilled part. */
+ if (nregs
+ && ! forced_late_switch
+ && ! short_block
+ && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (ret_start))
+ && nregs == hard_regno_nregs[ret_start][GET_MODE (ret_reg)]
+ /* For multi-hard-register floating point values,
+ sometimes the likely-spilled part is ordinarily copied
+ first, then the other part is set with an arithmetic
+ operation. This doesn't actually cause reload failures,
+ so let it pass. */
+ && (GET_MODE_CLASS (GET_MODE (ret_reg)) == MODE_INT
+ || nregs == 1))
+ abort ();
+ if (INSN_P (last_insn))
+ {
+ before_return_copy
+ = emit_note_before (NOTE_INSN_DELETED, last_insn);
+ /* Instructions preceding LAST_INSN in the same block might
+ require a different mode than MODE_EXIT, so if we might
+ have such instructions, keep them in a separate block
+ from pre_exit. */
+ if (last_insn != BB_HEAD (src_bb))
+ src_bb = split_block (src_bb,
+ PREV_INSN (before_return_copy))->dest;
+ }
+ else
+ before_return_copy = last_insn;
+ pre_exit = split_block (src_bb, before_return_copy)->src;
+ }
+ else
+ {
+ pre_exit = split_edge (eg);
+ COPY_REG_SET (pre_exit->global_live_at_start, live_at_end);
+ COPY_REG_SET (pre_exit->global_live_at_end, live_at_end);
+ }
+ }
+
+ return pre_exit;
+}
+#endif
+
/* Find all insns that need a particular mode setting, and insert the
necessary mode switches. Return true if we did work. */
int
-optimize_mode_switching (file)
- FILE *file;
+optimize_mode_switching (FILE *file)
{
rtx insn;
int e;
/* Create the list of segments within each basic block.
If NORMAL_MODE is defined, allow for two extra
blocks split from the entry and exit block. */
-#ifdef NORMAL_MODE
- entry_exit_extra = 2;
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
+ entry_exit_extra = 3;
#endif
bb_info[n_entities]
- = (struct bb_info *) xcalloc (last_basic_block + entry_exit_extra,
- sizeof **bb_info);
+ = xcalloc (last_basic_block + entry_exit_extra, sizeof **bb_info);
entity_map[n_entities++] = e;
if (num_modes[e] > max_num_modes)
max_num_modes = num_modes[e];
if (! n_entities)
return 0;
-#ifdef NORMAL_MODE
- {
- /* Split the edge from the entry block and the fallthrough edge to the
- exit block, so that we can note that there NORMAL_MODE is supplied /
- required. */
- edge eg;
- post_entry = split_edge (ENTRY_BLOCK_PTR->succ);
- /* The only non-call predecessor at this stage is a block with a
- fallthrough edge; there can be at most one, but there could be
- none at all, e.g. when exit is called. */
- for (pre_exit = 0, eg = EXIT_BLOCK_PTR->pred; eg; eg = eg->pred_next)
- if (eg->flags & EDGE_FALLTHRU)
- {
- regset live_at_end = eg->src->global_live_at_end;
-
- if (pre_exit)
- abort ();
- pre_exit = split_edge (eg);
- COPY_REG_SET (pre_exit->global_live_at_start, live_at_end);
- COPY_REG_SET (pre_exit->global_live_at_end, live_at_end);
- }
- }
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
+ /* Split the edge from the entry block, so that we can note that
+ there NORMAL_MODE is supplied. */
+ post_entry = split_edge (single_succ_edge (ENTRY_BLOCK_PTR));
+ pre_exit = create_pre_exit (n_entities, entity_map, num_modes);
#endif
/* Create the bitmap vectors. */
REG_SET_TO_HARD_REG_SET (live_now,
bb->global_live_at_start);
- for (insn = bb->head;
- insn != NULL && insn != NEXT_INSN (bb->end);
+ for (insn = BB_HEAD (bb);
+ insn != NULL && insn != NEXT_INSN (BB_END (bb));
insn = NEXT_INSN (insn))
{
if (INSN_P (insn))
add_seginfo (info + bb->index, ptr);
RESET_BIT (transp[bb->index], j);
}
-
+#ifdef MODE_AFTER
+ last_mode = MODE_AFTER (last_mode, insn);
+#endif
/* Update LIVE_NOW. */
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_DEAD)
/* Check for blocks without ANY mode requirements. */
if (last_mode == no_mode)
{
- ptr = new_seginfo (no_mode, bb->end, bb->index, live_now);
+ ptr = new_seginfo (no_mode, BB_END (bb), bb->index, live_now);
add_seginfo (info + bb->index, ptr);
}
}
-#ifdef NORMAL_MODE
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
{
- int mode = NORMAL_MODE (e);
+ int mode = MODE_ENTRY (e);
if (mode != no_mode)
{
info[bb->index].computing = mode;
if (pre_exit)
- info[pre_exit->index].seginfo->mode = mode;
+ info[pre_exit->index].seginfo->mode = MODE_EXIT (e);
}
}
#endif /* NORMAL_MODE */
for (i = 0; i < max_num_modes; i++)
{
int current_mode[N_ENTITIES];
+ sbitmap *delete;
+ sbitmap *insert;
/* Set the anticipatable and computing arrays. */
sbitmap_vector_zero (antic, last_basic_block);
if (eg->flags & EDGE_ABNORMAL)
{
emited = true;
- if (GET_CODE (src_bb->end) == JUMP_INSN)
- emit_insn_before (mode_set, src_bb->end);
+ if (JUMP_P (BB_END (src_bb)))
+ emit_insn_before (mode_set, BB_END (src_bb));
/* It doesn't make sense to switch to normal mode
after a CALL_INSN, so we're going to abort if we
find one. The cases in which a CALL_INSN may
the call (it wouldn't make sense, anyway). In
the case of EH edges, EH entry points also start
in normal mode, so a similar reasoning applies. */
- else if (GET_CODE (src_bb->end) == INSN)
- emit_insn_after (mode_set, src_bb->end);
+ else if (NONJUMP_INSN_P (BB_END (src_bb)))
+ emit_insn_after (mode_set, BB_END (src_bb));
else
abort ();
bb_info[j][src_bb->index].computing = mode;
}
}
+ sbitmap_vector_free (delete);
+ sbitmap_vector_free (insert);
clear_aux_for_edges ();
free_edge_list (edge_list);
}
mode_set = get_insns ();
end_sequence ();
- /* Do not bother to insert empty sequence. */
- if (mode_set == NULL_RTX)
- continue;
-
- emited = true;
- if (GET_CODE (ptr->insn_ptr) == NOTE
- && (NOTE_LINE_NUMBER (ptr->insn_ptr)
- == NOTE_INSN_BASIC_BLOCK))
- emit_insn_after (mode_set, ptr->insn_ptr);
- else
- emit_insn_before (mode_set, ptr->insn_ptr);
+ /* Insert MODE_SET only if it is nonempty. */
+ if (mode_set != NULL_RTX)
+ {
+ emited = true;
+ if (NOTE_P (ptr->insn_ptr)
+ && (NOTE_LINE_NUMBER (ptr->insn_ptr)
+ == NOTE_INSN_BASIC_BLOCK))
+ emit_insn_after (mode_set, ptr->insn_ptr);
+ else
+ emit_insn_before (mode_set, ptr->insn_ptr);
+ }
}
free (ptr);
sbitmap_vector_free (antic);
sbitmap_vector_free (transp);
sbitmap_vector_free (comp);
- sbitmap_vector_free (delete);
- sbitmap_vector_free (insert);
if (need_commit)
commit_edge_insertions ();
-#ifdef NORMAL_MODE
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
cleanup_cfg (CLEANUP_NO_INSN_DEL);
#else
if (!need_commit && !emited)
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