process. It is done in each region on top-down traverse of the
region tree (file ira-color.c). There are following subpasses:
- * Optional aggressive coalescing of allocnos in the region.
-
* Putting allocnos onto the coloring stack. IRA uses Briggs
optimistic coloring which is a major improvement over
Chaitin's coloring. Therefore IRA does not spill allocnos at
#include "output.h"
#include "except.h"
#include "reload.h"
-#include "toplev.h"
+#include "diagnostic-core.h"
#include "integrate.h"
#include "ggc.h"
#include "ira-int.h"
+struct target_ira default_target_ira;
+struct target_ira_int default_target_ira_int;
+#if SWITCHABLE_TARGET
+struct target_ira *this_target_ira = &default_target_ira;
+struct target_ira_int *this_target_ira_int = &default_target_ira_int;
+#endif
+
/* A modified value of flag `-fira-verbose' used internally. */
int internal_flag_ira_verbose;
/* Dump file of the allocator if it is not NULL. */
FILE *ira_dump_file;
-/* Pools for allocnos, copies, allocno live ranges. */
-alloc_pool allocno_pool, copy_pool, allocno_live_range_pool;
-
/* The number of elements in the following array. */
int ira_spilled_reg_stack_slots_num;
HARD_REG_SET eliminable_regset;
-/* Map: hard regs X modes -> set of hard registers for storing value
- of given mode starting with given hard register. */
-HARD_REG_SET ira_reg_mode_hard_regset[FIRST_PSEUDO_REGISTER][NUM_MACHINE_MODES];
-
-/* Array analogous to target hook TARGET_MEMORY_MOVE_COST. */
-short int ira_memory_move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][2];
-
-/* Array analogous to macro REGISTER_MOVE_COST. */
-move_table *ira_register_move_cost[MAX_MACHINE_MODE];
-
-/* Similar to may_move_in_cost but it is calculated in IRA instead of
- regclass. Another difference is that we take only available hard
- registers into account to figure out that one register class is a
- subset of the another one. */
-move_table *ira_may_move_in_cost[MAX_MACHINE_MODE];
-
-/* Similar to may_move_out_cost but it is calculated in IRA instead of
- regclass. Another difference is that we take only available hard
- registers into account to figure out that one register class is a
- subset of the another one. */
-move_table *ira_may_move_out_cost[MAX_MACHINE_MODE];
-
-/* Register class subset relation: TRUE if the first class is a subset
- of the second one considering only hard registers available for the
- allocation. */
-int ira_class_subset_p[N_REG_CLASSES][N_REG_CLASSES];
-
/* Temporary hard reg set used for a different calculation. */
static HARD_REG_SET temp_hard_regset;
}
\f
-
-/* Hard registers that can not be used for the register allocator for
- all functions of the current compilation unit. */
-static HARD_REG_SET no_unit_alloc_regs;
-
-/* Array of the number of hard registers of given class which are
- available for allocation. The order is defined by the
- allocation order. */
-short ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
-
-/* Array of the number of hard registers of given class which are
- available for allocation. The order is defined by the
- the hard register numbers. */
-short ira_non_ordered_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
-
-/* The number of elements of the above array for given register
- class. */
-int ira_class_hard_regs_num[N_REG_CLASSES];
-
-/* Index (in ira_class_hard_regs) for given register class and hard
- register (in general case a hard register can belong to several
- register classes). The index is negative for hard registers
- unavailable for the allocation. */
-short ira_class_hard_reg_index[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
+#define no_unit_alloc_regs \
+ (this_target_ira_int->x_no_unit_alloc_regs)
/* The function sets up the three arrays declared above. */
static void
CLEAR_HARD_REG_SET (processed_hard_reg_set);
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
- ira_non_ordered_class_hard_regs[cl][0] = -1;
- ira_class_hard_reg_index[cl][0] = -1;
+ ira_non_ordered_class_hard_regs[cl][i] = -1;
+ ira_class_hard_reg_index[cl][i] = -1;
}
for (n = 0, i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
}
}
-/* Number of given class hard registers available for the register
- allocation for given classes. */
-int ira_available_class_regs[N_REG_CLASSES];
-
/* Set up IRA_AVAILABLE_CLASS_REGS. */
static void
setup_available_class_regs (void)
}
\f
-
-/* For each reg class, table listing all the classes contained in it
- (excluding the class itself. Non-allocatable registers are
- excluded from the consideration). */
-static enum reg_class alloc_reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
+#define alloc_reg_class_subclasses \
+ (this_target_ira_int->x_alloc_reg_class_subclasses)
/* Initialize the table of subclasses of each reg class. */
static void
\f
-/* Number of cover classes. Cover classes is non-intersected register
- classes containing all hard-registers available for the
- allocation. */
-int ira_reg_class_cover_size;
-
-/* The array containing cover classes (see also comments for macro
- IRA_COVER_CLASSES). Only first IRA_REG_CLASS_COVER_SIZE elements are
- used for this. */
-enum reg_class ira_reg_class_cover[N_REG_CLASSES];
-
-/* The number of elements in the subsequent array. */
-int ira_important_classes_num;
-
-/* The array containing non-empty classes (including non-empty cover
- classes) which are subclasses of cover classes. Such classes is
- important for calculation of the hard register usage costs. */
-enum reg_class ira_important_classes[N_REG_CLASSES];
-
-/* The array containing indexes of important classes in the previous
- array. The array elements are defined only for important
- classes. */
-int ira_important_class_nums[N_REG_CLASSES];
-
/* Set the four global variables defined above. */
static void
setup_cover_and_important_classes (void)
{
int i, j, n, cl;
bool set_p;
- const enum reg_class *cover_classes;
+ const reg_class_t *cover_classes;
HARD_REG_SET temp_hard_regset2;
static enum reg_class classes[LIM_REG_CLASSES + 1];
= ira_reg_class_cover[j];
}
-/* Map of all register classes to corresponding cover class containing
- the given class. If given class is not a subset of a cover class,
- we translate it into the cheapest cover class. */
-enum reg_class ira_class_translate[N_REG_CLASSES];
-
/* Set up array IRA_CLASS_TRANSLATE. */
static void
setup_class_translate (void)
}
/* Order numbers of cover classes in original target cover class
- array, -1 for non-cover classes. */
+ array, -1 for non-cover classes. This is only live during
+ reorder_important_classes. */
static int cover_class_order[N_REG_CLASSES];
/* The function used to sort the important classes. */
}
/* Reorder important classes according to the order of their cover
- classes. Set up array ira_important_class_nums too. */
+ classes. */
static void
reorder_important_classes (void)
{
cover_class_order[ira_reg_class_cover[i]] = i;
qsort (ira_important_classes, ira_important_classes_num,
sizeof (enum reg_class), comp_reg_classes_func);
- for (i = 0; i < ira_important_classes_num; i++)
- ira_important_class_nums[ira_important_classes[i]] = i;
-}
-
-/* The biggest important reg_class inside of intersection of the two
- reg_classes (that is calculated taking only hard registers
- available for allocation into account). If the both reg_classes
- contain no hard registers available for allocation, the value is
- calculated by taking all hard-registers including fixed ones into
- account. */
-enum reg_class ira_reg_class_intersect[N_REG_CLASSES][N_REG_CLASSES];
-
-/* True if the two classes (that is calculated taking only hard
- registers available for allocation into account) are
- intersected. */
-bool ira_reg_classes_intersect_p[N_REG_CLASSES][N_REG_CLASSES];
-
-/* Important classes with end marker LIM_REG_CLASSES which are
- supersets with given important class (the first index). That
- includes given class itself. This is calculated taking only hard
- registers available for allocation into account. */
-enum reg_class ira_reg_class_super_classes[N_REG_CLASSES][N_REG_CLASSES];
-
-/* The biggest important reg_class inside of union of the two
- reg_classes (that is calculated taking only hard registers
- available for allocation into account). If the both reg_classes
- contain no hard registers available for allocation, the value is
- calculated by taking all hard-registers including fixed ones into
- account. In other words, the value is the corresponding
- reg_class_subunion value. */
-enum reg_class ira_reg_class_union[N_REG_CLASSES][N_REG_CLASSES];
+}
/* Set up the above reg class relations. */
static void
\f
-/* Map: hard register number -> cover class it belongs to. If the
- corresponding class is NO_REGS, the hard register is not available
- for allocation. */
-enum reg_class ira_hard_regno_cover_class[FIRST_PSEUDO_REGISTER];
-
/* Set up the array above. */
static void
setup_hard_regno_cover_class (void)
\f
-/* Map: register class x machine mode -> number of hard registers of
- given class needed to store value of given mode. If the number is
- different, the size will be negative. */
-int ira_reg_class_nregs[N_REG_CLASSES][MAX_MACHINE_MODE];
-
-/* Maximal value of the previous array elements. */
-int ira_max_nregs;
-
/* Form IRA_REG_CLASS_NREGS map. */
static void
setup_reg_class_nregs (void)
{
int cl, m;
- ira_max_nregs = -1;
for (cl = 0; cl < N_REG_CLASSES; cl++)
for (m = 0; m < MAX_MACHINE_MODE; m++)
- {
- ira_reg_class_nregs[cl][m] = CLASS_MAX_NREGS ((enum reg_class) cl,
- (enum machine_mode) m);
- if (ira_max_nregs < ira_reg_class_nregs[cl][m])
- ira_max_nregs = ira_reg_class_nregs[cl][m];
- }
+ ira_reg_class_nregs[cl][m] = CLASS_MAX_NREGS ((enum reg_class) cl,
+ (enum machine_mode) m);
}
\f
-/* Array whose values are hard regset of hard registers available for
- the allocation of given register class whose HARD_REGNO_MODE_OK
- values for given mode are zero. */
-HARD_REG_SET prohibited_class_mode_regs[N_REG_CLASSES][NUM_MACHINE_MODES];
-
/* Set up PROHIBITED_CLASS_MODE_REGS. */
static void
setup_prohibited_class_mode_regs (void)
}
\f
-
-/* Array whose values are hard regset of hard registers for which
- move of the hard register in given mode into itself is
- prohibited. */
-HARD_REG_SET ira_prohibited_mode_move_regs[NUM_MACHINE_MODES];
-
-/* Flag of that the above array has been initialized. */
-static bool ira_prohibited_mode_move_regs_initialized_p = false;
+#define ira_prohibited_mode_move_regs_initialized_p \
+ (this_target_ira_int->x_ira_prohibited_mode_move_regs_initialized_p)
/* Set up IRA_PROHIBITED_MODE_MOVE_REGS. */
static void
test_reg1 = gen_rtx_REG (VOIDmode, 0);
test_reg2 = gen_rtx_REG (VOIDmode, 0);
move_pat = gen_rtx_SET (VOIDmode, test_reg1, test_reg2);
- move_insn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, move_pat, -1, 0);
+ move_insn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, move_pat, 0, -1, 0);
for (i = 0; i < NUM_MACHINE_MODES; i++)
{
SET_HARD_REG_SET (ira_prohibited_mode_move_regs[i]);
{
if (! HARD_REGNO_MODE_OK (j, (enum machine_mode) i))
continue;
- SET_REGNO (test_reg1, j);
+ SET_REGNO_RAW (test_reg1, j);
PUT_MODE (test_reg1, (enum machine_mode) i);
- SET_REGNO (test_reg2, j);
+ SET_REGNO_RAW (test_reg2, j);
PUT_MODE (test_reg2, (enum machine_mode) i);
INSN_CODE (move_insn) = -1;
recog_memoized (move_insn);
static bool
ira_bad_reload_regno_1 (int regno, rtx x)
{
- int x_regno;
+ int x_regno, n, i;
ira_allocno_t a;
enum reg_class pref;
/* If the pseudo conflicts with REGNO, then we consider REGNO a
poor choice for a reload regno. */
a = ira_regno_allocno_map[x_regno];
- if (TEST_HARD_REG_BIT (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), regno))
- return true;
-
+ n = ALLOCNO_NUM_OBJECTS (a);
+ for (i = 0; i < n; i++)
+ {
+ ira_object_t obj = ALLOCNO_OBJECT (a, i);
+ if (TEST_HARD_REG_BIT (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), regno))
+ return true;
+ }
return false;
}
else
df_set_regs_ever_live (eliminables[i].from, true);
}
-#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
+#if !HARD_FRAME_POINTER_IS_FRAME_POINTER
if (!TEST_HARD_REG_BIT (crtl->asm_clobbers, HARD_FRAME_POINTER_REGNUM))
{
SET_HARD_REG_BIT (eliminable_regset, HARD_FRAME_POINTER_REGNUM);
static void
check_allocation (void)
{
- ira_allocno_t a, conflict_a;
- int hard_regno, conflict_hard_regno, nregs, conflict_nregs;
- ira_allocno_conflict_iterator aci;
+ ira_allocno_t a;
+ int hard_regno, nregs, conflict_nregs;
ira_allocno_iterator ai;
FOR_EACH_ALLOCNO (a, ai)
{
+ int n = ALLOCNO_NUM_OBJECTS (a);
+ int i;
+
if (ALLOCNO_CAP_MEMBER (a) != NULL
|| (hard_regno = ALLOCNO_HARD_REGNO (a)) < 0)
continue;
nregs = hard_regno_nregs[hard_regno][ALLOCNO_MODE (a)];
- FOR_EACH_ALLOCNO_CONFLICT (a, conflict_a, aci)
- if ((conflict_hard_regno = ALLOCNO_HARD_REGNO (conflict_a)) >= 0)
- {
- conflict_nregs
- = (hard_regno_nregs
- [conflict_hard_regno][ALLOCNO_MODE (conflict_a)]);
- if ((conflict_hard_regno <= hard_regno
- && hard_regno < conflict_hard_regno + conflict_nregs)
- || (hard_regno <= conflict_hard_regno
- && conflict_hard_regno < hard_regno + nregs))
- {
- fprintf (stderr, "bad allocation for %d and %d\n",
- ALLOCNO_REGNO (a), ALLOCNO_REGNO (conflict_a));
- gcc_unreachable ();
- }
- }
+ if (nregs == 1)
+ /* We allocated a single hard register. */
+ n = 1;
+ else if (n > 1)
+ /* We allocated multiple hard registers, and we will test
+ conflicts in a granularity of single hard regs. */
+ nregs = 1;
+
+ for (i = 0; i < n; i++)
+ {
+ ira_object_t obj = ALLOCNO_OBJECT (a, i);
+ ira_object_t conflict_obj;
+ ira_object_conflict_iterator oci;
+ int this_regno = hard_regno;
+ if (n > 1)
+ {
+ if (WORDS_BIG_ENDIAN)
+ this_regno += n - i - 1;
+ else
+ this_regno += i;
+ }
+ FOR_EACH_OBJECT_CONFLICT (obj, conflict_obj, oci)
+ {
+ ira_allocno_t conflict_a = OBJECT_ALLOCNO (conflict_obj);
+ int conflict_hard_regno = ALLOCNO_HARD_REGNO (conflict_a);
+ if (conflict_hard_regno < 0)
+ continue;
+
+ conflict_nregs
+ = (hard_regno_nregs
+ [conflict_hard_regno][ALLOCNO_MODE (conflict_a)]);
+
+ if (ALLOCNO_NUM_OBJECTS (conflict_a) > 1
+ && conflict_nregs == ALLOCNO_NUM_OBJECTS (conflict_a))
+ {
+ if (WORDS_BIG_ENDIAN)
+ conflict_hard_regno += (ALLOCNO_NUM_OBJECTS (conflict_a)
+ - OBJECT_SUBWORD (conflict_obj) - 1);
+ else
+ conflict_hard_regno += OBJECT_SUBWORD (conflict_obj);
+ conflict_nregs = 1;
+ }
+
+ if ((conflict_hard_regno <= this_regno
+ && this_regno < conflict_hard_regno + conflict_nregs)
+ || (this_regno <= conflict_hard_regno
+ && conflict_hard_regno < this_regno + nregs))
+ {
+ fprintf (stderr, "bad allocation for %d and %d\n",
+ ALLOCNO_REGNO (a), ALLOCNO_REGNO (conflict_a));
+ gcc_unreachable ();
+ }
+ }
+ }
}
}
#endif
if (find_reg_note (insn, REG_DEAD, reg))
return 1;
- if (CALL_P (insn) && ! MEM_READONLY_P (memref)
- && ! RTL_CONST_OR_PURE_CALL_P (insn))
+ /* This used to ignore readonly memory and const/pure calls. The problem
+ is the equivalent form may reference a pseudo which gets assigned a
+ call clobbered hard reg. When we later replace REG with its
+ equivalent form, the value in the call-clobbered reg has been
+ changed and all hell breaks loose. */
+ if (CALL_P (insn))
return 0;
note_stores (PATTERN (insn), validate_equiv_mem_from_store, NULL);
if (!REG_P (dest)
|| (regno = REGNO (dest)) < FIRST_PSEUDO_REGISTER
|| reg_equiv[regno].init_insns == const0_rtx
- || (CLASS_LIKELY_SPILLED_P (reg_preferred_class (regno))
+ || (targetm.class_likely_spilled_p (reg_preferred_class (regno))
&& MEM_P (src) && ! reg_equiv[regno].is_arg_equivalence))
{
/* This might be setting a SUBREG of a pseudo, a pseudo that is
rtx equiv_insn;
if (! reg_equiv[regno].replace
- || reg_equiv[regno].loop_depth < loop_depth)
+ || reg_equiv[regno].loop_depth < loop_depth
+ /* There is no sense to move insns if we did
+ register pressure-sensitive scheduling was
+ done because it will not improve allocation
+ but worsen insn schedule with a big
+ probability. */
+ || (flag_sched_pressure && flag_schedule_insns))
continue;
/* reg_equiv[REGNO].replace gets set only when
{
/* Consider spilled pseudos too for IRA because they still have a
chance to get hard-registers in the reload when IRA is used. */
- return (reg_renumber[regno] >= 0
- || (ira_conflicts_p && flag_ira_share_spill_slots));
+ return (reg_renumber[regno] >= 0 || ira_conflicts_p);
}
/* Init LIVE_SUBREGS[ALLOCNUM] and LIVE_SUBREGS_USED[ALLOCNUM] using
{
timevar_push (TV_JUMP);
rebuild_jump_labels (get_insns ());
- purge_all_dead_edges ();
+ if (purge_all_dead_edges ())
+ delete_unreachable_blocks ();
timevar_pop (TV_JUMP);
}
}
ira_assert (ira_conflicts_p || !loops_p);
saved_flag_ira_share_spill_slots = flag_ira_share_spill_slots;
- if (too_high_register_pressure_p ())
+ if (too_high_register_pressure_p () || cfun->calls_setjmp)
/* It is just wasting compiler's time to pack spilled pseudos into
- stack slots in this case -- prohibit it. */
+ stack slots in this case -- prohibit it. We also do this if
+ there is setjmp call because a variable not modified between
+ setjmp and longjmp the compiler is required to preserve its
+ value and sharing slots does not guarantee it. */
flag_ira_share_spill_slots = FALSE;
ira_color ();
reload_completed = !reload (get_insns (), ira_conflicts_p);
- finish_subregs_of_mode ();
-
timevar_pop (TV_RELOAD);
timevar_push (TV_IRA);
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