#include "tree-pass.h"
#include "df.h"
-static int perhaps_ends_bb_p (rtx);
static int optimize_reg_copy_1 (rtx, rtx, rtx);
static void optimize_reg_copy_2 (rtx, rtx, rtx);
static void optimize_reg_copy_3 (rtx, rtx, rtx);
static void copy_src_to_dest (rtx, rtx, rtx);
+enum match_use
+{
+ READ,
+ WRITE,
+ READWRITE
+};
+
struct match {
int with[MAX_RECOG_OPERANDS];
- enum { READ, WRITE, READWRITE } use[MAX_RECOG_OPERANDS];
+ enum match_use use[MAX_RECOG_OPERANDS];
int commutative[MAX_RECOG_OPERANDS];
int early_clobber[MAX_RECOG_OPERANDS];
};
static int find_matches (rtx, struct match *);
-static int regclass_compatible_p (int, int);
static int fixup_match_2 (rtx, rtx, rtx, rtx);
/* Return nonzero if registers with CLASS1 and CLASS2 can be merged without
causing too much register allocation problems. */
static int
-regclass_compatible_p (int class0, int class1)
+regclass_compatible_p (enum reg_class class0, enum reg_class class1)
{
return (class0 == class1
|| (reg_class_subset_p (class0, class1)
changed. */
rtx note = find_reg_note (insn, REG_DEAD, reg);
if (note)
- PUT_MODE (note, REG_UNUSED);
+ PUT_REG_NOTE_KIND (note, REG_UNUSED);
add_reg_note (insn, REG_INC, reg);
\f
static int *regno_src_regno;
-\f
-/* Return 1 if INSN might end a basic block. */
-
-static int perhaps_ends_bb_p (rtx insn)
-{
- switch (GET_CODE (insn))
- {
- case CODE_LABEL:
- case JUMP_INSN:
- /* These always end a basic block. */
- return 1;
-
- case CALL_INSN:
- /* A CALL_INSN might be the last insn of a basic block, if it is inside
- an EH region or if there are nonlocal gotos. Note that this test is
- very conservative. */
- if (nonlocal_goto_handler_labels)
- return 1;
- /* Fall through. */
- default:
- return can_throw_internal (insn);
- }
-}
-\f
/* INSN is a copy from SRC to DEST, both registers, and SRC does not die
in INSN.
rtx dest_death = 0;
int sregno = REGNO (src);
int dregno = REGNO (dest);
+ basic_block bb = BLOCK_FOR_INSN (insn);
/* We don't want to mess with hard regs if register classes are small. */
if (sregno == dregno
for (p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
{
- /* ??? We can't scan past the end of a basic block without updating
- the register lifetime info (REG_DEAD/basic_block_live_at_start). */
- if (perhaps_ends_bb_p (p))
- break;
- else if (! INSN_P (p))
+ if (! INSN_P (p))
continue;
+ if (BLOCK_FOR_INSN (p) != bb)
+ break;
if (reg_set_p (src, p) || reg_set_p (dest, p)
/* If SRC is an asm-declared register, it must not be replaced
rtx set;
int sregno = REGNO (src);
int dregno = REGNO (dest);
+ basic_block bb = BLOCK_FOR_INSN (insn);
for (p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
{
- /* ??? We can't scan past the end of a basic block without updating
- the register lifetime info (REG_DEAD/basic_block_live_at_start). */
- if (perhaps_ends_bb_p (p))
- break;
- else if (! INSN_P (p))
+ if (! INSN_P (p))
continue;
+ if (BLOCK_FOR_INSN (p) != bb)
+ break;
set = single_set (p);
if (set && SET_SRC (set) == dest && SET_DEST (set) == src
int dst_no = REGNO (dest);
rtx p, set;
enum machine_mode old_mode;
+ basic_block bb = BLOCK_FOR_INSN (insn);
if (src_no < FIRST_PSEUDO_REGISTER
|| dst_no < FIRST_PSEUDO_REGISTER
|| REG_N_DEATHS (src_no) != 1
|| REG_N_SETS (src_no) != 1)
return;
+
for (p = PREV_INSN (insn); p && ! reg_set_p (src_reg, p); p = PREV_INSN (p))
- /* ??? We can't scan past the end of a basic block without updating
- the register lifetime info (REG_DEAD/basic_block_live_at_start). */
- if (perhaps_ends_bb_p (p))
+ if (INSN_P (p) && BLOCK_FOR_INSN (p) != bb)
break;
-
- if (! p)
+
+ if (! p || BLOCK_FOR_INSN (p) != bb)
return;
if (! (set = single_set (p))
{
rtx p, dst_death = 0;
int length, num_calls = 0, freq_calls = 0;
+ basic_block bb = BLOCK_FOR_INSN (insn);
/* If SRC dies in INSN, we'd have to move the death note. This is
considered to be very unlikely, so we just skip the optimization
{
rtx pset;
- /* ??? We can't scan past the end of a basic block without updating
- the register lifetime info (REG_DEAD/basic_block_live_at_start). */
- if (perhaps_ends_bb_p (p))
- break;
- else if (! INSN_P (p))
+ if (! INSN_P (p))
continue;
+ if (BLOCK_FOR_INSN (p) != bb)
+ break;
if (find_regno_note (p, REG_DEAD, REGNO (dst)))
dst_death = p;
#ifdef AUTO_INC_DEC
for (p = PREV_INSN (insn); p; p = PREV_INSN (p))
{
- if (LABEL_P (p)
- || JUMP_P (p))
- break;
if (! INSN_P (p))
continue;
+ if (BLOCK_FOR_INSN (p) != bb)
+ break;
if (reg_overlap_mentioned_p (dst, PATTERN (p)))
{
if (try_auto_increment (p, insn, 0, dst, newconst, 0))
}
for (p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
{
- if (LABEL_P (p)
- || JUMP_P (p))
- break;
if (! INSN_P (p))
continue;
+ if (BLOCK_FOR_INSN (p) != bb)
+ break;
if (reg_overlap_mentioned_p (dst, PATTERN (p)))
{
try_auto_increment (p, insn, 0, dst, newconst, 1);
return 0;
}
-/* Main entry for the register move optimization. */
+/* A forward pass. Replace output operands with input operands. */
-static unsigned int
-regmove_optimize (void)
+static void
+regmove_forward_pass (void)
{
+ basic_block bb;
rtx insn;
- struct match match;
- int i;
- rtx copy_src, copy_dst;
- int nregs = max_reg_num ();
-
- /* ??? Hack. Regmove doesn't examine the CFG, and gets mightily
- confused by non-call exceptions ending blocks. */
- if (flag_non_call_exceptions)
- return 0;
-
- df_note_add_problem ();
- df_analyze ();
- regstat_init_n_sets_and_refs ();
- regstat_compute_ri ();
-
- regno_src_regno = XNEWVEC (int, nregs);
- for (i = nregs; --i >= 0; )
- regno_src_regno[i] = -1;
+ if (! flag_expensive_optimizations)
+ return;
- /* A forward pass. Replace output operands with input operands. */
+ if (dump_file)
+ fprintf (dump_file, "Starting forward pass...\n");
- if (flag_expensive_optimizations)
+ FOR_EACH_BB (bb)
{
- if (dump_file)
- fprintf (dump_file, "Starting forward pass...\n");
-
- for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
+ FOR_BB_INSNS (bb, insn)
{
rtx set = single_set (insn);
if (! set)
}
}
}
+}
- /* A backward pass. Replace input operands with output operands. */
+/* A backward pass. Replace input operands with output operands. */
+
+static void
+regmove_backward_pass (void)
+{
+ basic_block bb;
+ rtx insn, prev;
if (dump_file)
fprintf (dump_file, "Starting backward pass...\n");
- for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
+ FOR_EACH_BB_REVERSE (bb)
{
- if (INSN_P (insn))
+ /* ??? Use the safe iterator because fixup_match_2 can remove
+ insns via try_auto_increment. */
+ FOR_BB_INSNS_REVERSE_SAFE (bb, insn, prev)
{
+ struct match match;
+ rtx copy_src, copy_dst;
int op_no, match_no;
int success = 0;
+ if (! INSN_P (insn))
+ continue;
+
if (! find_matches (insn, &match))
continue;
{
rtx pset;
- /* ??? We can't scan past the end of a basic block without
- updating the register lifetime info
- (REG_DEAD/basic_block_live_at_start). */
- if (perhaps_ends_bb_p (p))
- break;
- else if (! INSN_P (p))
+ if (! INSN_P (p))
continue;
+ if (BLOCK_FOR_INSN (p) != bb)
+ break;
length++;
copy_src_to_dest (insn, copy_src, copy_dst);
}
}
+}
+
+/* Main entry for the register move optimization. */
+
+static unsigned int
+regmove_optimize (void)
+{
+ int i;
+ int nregs = max_reg_num ();
+
+ df_note_add_problem ();
+ df_analyze ();
+
+ regstat_init_n_sets_and_refs ();
+ regstat_compute_ri ();
+
+ regno_src_regno = XNEWVEC (int, nregs);
+ for (i = nregs; --i >= 0; )
+ regno_src_regno[i] = -1;
+
+ /* A forward pass. Replace output operands with input operands. */
+ regmove_forward_pass ();
+
+ /* A backward pass. Replace input operands with output operands. */
+ regmove_backward_pass ();
/* Clean up. */
free (regno_src_regno);
TODO_ggc_collect /* todo_flags_finish */
}
};
-
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