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tcg: Consolidate 3 bits into enum TCGTempKind

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The temp_fixed, temp_global, temp_local bits are all related.
Combine them into a single enumeration.

Backports ee17db83d2dce35792e9bf03366af193e5e0e5c9
This commit is contained in:
Richard Henderson 2021-03-03 20:39:36 -05:00 committed by Lioncash
parent 520ec7ca76
commit 30739864d2
3 changed files with 96 additions and 66 deletions
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8
qemu/tcg/optimize.c
View file

@ -118,21 +118,21 @@ static TCGTemp *find_better_copy(TCGTemp *ts)
TCGTemp *i;
/* If this is already a global, we can't do better. */
if (ts->temp_global) {
if (ts->kind >= TEMP_GLOBAL) {
return ts;
}
/* Search for a global first. */
for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
if (i->temp_global) {
if (i->kind >= TEMP_GLOBAL) {
return i;
}
}
/* If it is a temp, search for a temp local. */
if (!ts->temp_local) {
if (ts->kind == TEMP_NORMAL) {
for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
if (ts->temp_local) {
if (i->kind >= TEMP_LOCAL) {
return i;
}
}

134
qemu/tcg/tcg.c
View file

@ -550,7 +550,7 @@ static inline TCGTemp *tcg_global_alloc(TCGContext *s)
tcg_debug_assert(s->nb_globals == s->nb_temps);
s->nb_globals++;
ts = tcg_temp_alloc(s);
ts->temp_global = 1;
ts->kind = TEMP_GLOBAL;
return ts;
}
@ -567,7 +567,7 @@ static TCGTemp *tcg_global_reg_new_internal(TCGContext *s, TCGType type,
ts = tcg_global_alloc(s);
ts->base_type = type;
ts->type = type;
ts->fixed_reg = 1;
ts->kind = TEMP_FIXED;
ts->reg = reg;
ts->name = name;
tcg_regset_set_reg(s->reserved_regs, reg);
@ -616,7 +616,7 @@ TCGTemp *tcg_global_mem_new_internal(TCGContext *s, TCGType type, TCGv_ptr base,
bigendian = 1;
#endif
if (!base_ts->fixed_reg) {
if (base_ts->kind != TEMP_FIXED) {
/* We do not support double-indirect registers. */
tcg_debug_assert(!base_ts->indirect_reg);
base_ts->indirect_base = 1;
@ -663,6 +663,7 @@ TCGTemp *tcg_global_mem_new_internal(TCGContext *s, TCGType type, TCGv_ptr base,
TCGTemp *tcg_temp_new_internal(TCGContext *s, TCGType type, bool temp_local)
{
TCGTempKind kind = temp_local ? TEMP_LOCAL : TEMP_NORMAL;
TCGTemp *ts;
int idx, k;
@ -675,7 +676,7 @@ TCGTemp *tcg_temp_new_internal(TCGContext *s, TCGType type, bool temp_local)
ts = &s->temps[idx];
ts->temp_allocated = 1;
tcg_debug_assert(ts->base_type == type);
tcg_debug_assert(ts->temp_local == temp_local);
tcg_debug_assert(ts->kind == kind);
} else {
ts = tcg_temp_alloc(s);
if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
@ -684,18 +685,18 @@ TCGTemp *tcg_temp_new_internal(TCGContext *s, TCGType type, bool temp_local)
ts->base_type = type;
ts->type = TCG_TYPE_I32;
ts->temp_allocated = 1;
ts->temp_local = temp_local;
ts->kind = kind;
tcg_debug_assert(ts2 == ts + 1);
ts2->base_type = TCG_TYPE_I64;
ts2->type = TCG_TYPE_I32;
ts2->temp_allocated = 1;
ts2->temp_local = temp_local;
ts2->kind = kind;
} else {
ts->base_type = type;
ts->type = type;
ts->temp_allocated = 1;
ts->temp_local = temp_local;
ts->kind = kind;
}
}
@ -751,12 +752,12 @@ void tcg_temp_free_internal(TCGContext *s, TCGTemp *ts)
}
#endif
tcg_debug_assert(ts->temp_global == 0);
tcg_debug_assert(ts->kind < TEMP_GLOBAL);
tcg_debug_assert(ts->temp_allocated != 0);
ts->temp_allocated = 0;
idx = temp_idx(s, ts);
k = ts->base_type + (ts->temp_local ? TCG_TYPE_COUNT : 0);
k = ts->base_type + (ts->kind == TEMP_NORMAL ? 0 : TCG_TYPE_COUNT);
set_bit(idx, s->free_temps[k].l);
}
@ -1280,17 +1281,27 @@ void tcg_gen_callN(TCGContext *s, void *func, TCGTemp *ret, int nargs, TCGTemp *
static void tcg_reg_alloc_start(TCGContext *s)
{
int i, n;
TCGTemp *ts;
for (i = 0, n = s->nb_globals; i < n; i++) {
ts = &s->temps[i];
ts->val_type = (ts->fixed_reg ? TEMP_VAL_REG : TEMP_VAL_MEM);
}
for (n = s->nb_temps; i < n; i++) {
ts = &s->temps[i];
ts->val_type = (ts->temp_local ? TEMP_VAL_MEM : TEMP_VAL_DEAD);
ts->mem_allocated = 0;
ts->fixed_reg = 0;
for (i = 0, n = s->nb_temps; i < n; i++) {
TCGTemp *ts = &s->temps[i];
TCGTempVal val = TEMP_VAL_MEM;
switch (ts->kind) {
case TEMP_FIXED:
val = TEMP_VAL_REG;
break;
case TEMP_GLOBAL:
break;
case TEMP_NORMAL:
val = TEMP_VAL_DEAD;
/* fall through */
case TEMP_LOCAL:
ts->mem_allocated = 0;
break;
default:
g_assert_not_reached();
}
ts->val_type = val;
}
memset(s->reg_to_temp, 0, sizeof(s->reg_to_temp));
@ -1301,12 +1312,17 @@ static char *tcg_get_arg_str_ptr(TCGContext *s, char *buf, int buf_size,
{
int idx = temp_idx(s, ts);
if (ts->temp_global) {
switch (ts->kind) {
case TEMP_FIXED:
case TEMP_GLOBAL:
pstrcpy(buf, buf_size, ts->name);
} else if (ts->temp_local) {
break;
case TEMP_LOCAL:
snprintf(buf, buf_size, "loc%d", idx - s->nb_globals);
} else {
break;
case TEMP_NORMAL:
snprintf(buf, buf_size, "tmp%d", idx - s->nb_globals);
break;
}
return buf;
}
@ -1897,15 +1913,24 @@ static void la_bb_end(TCGContext *s, int ng, int nt)
{
int i;
for (i = 0; i < ng; ++i) {
s->temps[i].state = TS_DEAD | TS_MEM;
la_reset_pref(s, &s->temps[i]);
}
for (i = ng; i < nt; ++i) {
s->temps[i].state = (s->temps[i].temp_local
? TS_DEAD | TS_MEM
: TS_DEAD);
la_reset_pref(s, &s->temps[i]);
for (i = 0; i < nt; ++i) {
TCGTemp *ts = &s->temps[i];
int state;
switch (ts->kind) {
case TEMP_FIXED:
case TEMP_GLOBAL:
case TEMP_LOCAL:
state = TS_DEAD | TS_MEM;
break;
case TEMP_NORMAL:
state = TS_DEAD;
break;
default:
g_assert_not_reached();
}
ts->state = state;
la_reset_pref(s, ts);
}
}
@ -1944,8 +1969,8 @@ static inline void tcg_la_br_end(TCGContext *s)
la_global_sync(s, ng);
for (i = ng; i < nt; i++) {
s->temps[i].state = s->temps[i].temp_local ? TS_DEAD | TS_MEM
: TS_MEM;
s->temps[i].state = s->temps[i].kind == TEMP_LOCAL ? TS_DEAD | TS_MEM
: TS_MEM;
la_reset_pref(s, &s->temps[i]);
}
}
@ -2542,7 +2567,8 @@ static void check_regs(TCGContext *s)
}
for (k = 0; k < s->nb_temps; k++) {
ts = &s->temps[k];
if (ts->val_type == TEMP_VAL_REG && !ts->fixed_reg
if (ts->val_type == TEMP_VAL_REG
&& ts->kind != TEMP_FIXED
&& s->reg_to_temp[ts->reg] != ts) {
printf("Inconsistency for temp %s:\n",
tcg_get_arg_str_ptr(s, buf, sizeof(buf), ts));
@ -2579,15 +2605,14 @@ static void temp_load(TCGContext *, TCGTemp *, TCGRegSet, TCGRegSet, TCGRegSet);
mark it free; otherwise mark it dead. */
static void temp_free_or_dead(TCGContext *s, TCGTemp *ts, int free_or_dead)
{
if (ts->fixed_reg) {
if (ts->kind == TEMP_FIXED) {
return;
}
if (ts->val_type == TEMP_VAL_REG) {
s->reg_to_temp[ts->reg] = NULL;
}
ts->val_type = (free_or_dead < 0
|| ts->temp_local
|| ts->temp_global
|| ts->kind != TEMP_NORMAL
? TEMP_VAL_MEM : TEMP_VAL_DEAD);
}
@ -2604,7 +2629,7 @@ static inline void temp_dead(TCGContext *s, TCGTemp *ts)
static void temp_sync(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs,
TCGRegSet preferred_regs, int free_or_dead)
{
if (ts->fixed_reg) {
if (ts->kind == TEMP_FIXED) {
return;
}
if (!ts->mem_coherent) {
@ -2787,7 +2812,8 @@ static void temp_save(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs)
{
/* The liveness analysis already ensures that globals are back
in memory. Keep an tcg_debug_assert for safety. */
tcg_debug_assert(ts->val_type == TEMP_VAL_MEM || ts->fixed_reg);
tcg_debug_assert(ts->val_type == TEMP_VAL_MEM
|| ts->kind == TEMP_FIXED);
}
/* save globals to their canonical location and assume they can be
@ -2812,7 +2838,7 @@ static void sync_globals(TCGContext *s, TCGRegSet allocated_regs)
for (i = 0, n = s->nb_globals; i < n; i++) {
TCGTemp *ts = &s->temps[i];
tcg_debug_assert(ts->val_type != TEMP_VAL_REG
|| ts->fixed_reg
|| ts->kind == TEMP_FIXED
|| ts->mem_coherent);
}
}
@ -2825,7 +2851,7 @@ static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs)
for (i = s->nb_globals; i < s->nb_temps; i++) {
TCGTemp *ts = &s->temps[i];
if (ts->temp_local) {
if (ts->kind == TEMP_LOCAL) {
temp_save(s, ts, allocated_regs);
} else {
/* The liveness analysis already ensures that temps are dead.
@ -2845,7 +2871,7 @@ static void tcg_reg_alloc_do_movi(TCGContext *s, TCGTemp *ots,
TCGRegSet preferred_regs)
{
/* ENV should not be modified. */
tcg_debug_assert(!ots->fixed_reg);
tcg_debug_assert(ots->kind != TEMP_FIXED);
/* The movi is not explicitly generated here. */
if (ots->val_type == TEMP_VAL_REG) {
@ -2885,7 +2911,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
ts = arg_temp(op->args[1]);
/* ENV should not be modified. */
tcg_debug_assert(!ots->fixed_reg);
tcg_debug_assert(ots->kind != TEMP_FIXED);
/* Note that otype != itype for no-op truncation. */
otype = ots->type;
@ -2924,7 +2950,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
}
temp_dead(s, ots);
} else {
if (IS_DEAD_ARG(1) && !ts->fixed_reg) {
if (IS_DEAD_ARG(1) && ts->kind != TEMP_FIXED) {
/* the mov can be suppressed */
if (ots->val_type == TEMP_VAL_REG) {
s->reg_to_temp[ots->reg] = NULL;
@ -2946,7 +2972,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
* Store the source register into the destination slot
* and leave the destination temp as TEMP_VAL_MEM.
*/
assert(!ots->fixed_reg);
assert(ots->kind != TEMP_FIXED);
if (!ts->mem_allocated) {
temp_allocate_frame(s, ots);
}
@ -2983,7 +3009,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp *op)
its = arg_temp(op->args[1]);
/* ENV should not be modified. */
tcg_debug_assert(!ots->fixed_reg);
tcg_debug_assert(ots->kind != TEMP_FIXED);
itype = its->type;
vece = TCGOP_VECE(op);
@ -3123,7 +3149,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
i_preferred_regs = o_preferred_regs = 0;
if (arg_ct->ialias) {
o_preferred_regs = op->output_pref[arg_ct->alias_index];
if (ts->fixed_reg) {
if (ts->kind == TEMP_FIXED) {
/* if fixed register, we must allocate a new register
if the alias is not the same register */
if (arg != op->args[arg_ct->alias_index]) {
@ -3160,7 +3186,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
/* nothing to do : the constraint is satisfied */
} else {
allocate_in_reg:
/* allocate a new register matching the constraint
/* allocate a new register matching the constraint
and move the temporary register into it */
temp_load(s, ts, s->tcg_target_available_regs[ts->type],
i_allocated_regs, 0);
@ -3180,7 +3206,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
const_args[i] = 0;
tcg_regset_set_reg(i_allocated_regs, reg);
}
/* mark dead temporaries and free the associated registers */
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
if (IS_DEAD_ARG(i)) {
@ -3192,7 +3218,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
tcg_reg_alloc_bb_end(s, i_allocated_regs);
} else {
if (def->flags & TCG_OPF_CALL_CLOBBER) {
/* XXX: permit generic clobber register list ? */
/* XXX: permit generic clobber register list ? */
for (i = 0; i < TCG_TARGET_NB_REGS; i++) {
if (tcg_regset_test_reg(s->tcg_target_call_clobber_regs, i)) {
tcg_reg_free(s, i, i_allocated_regs);
@ -3204,7 +3230,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
an exception. */
sync_globals(s, i_allocated_regs);
}
/* satisfy the output constraints */
for(k = 0; k < nb_oargs; k++) {
i = def->args_ct[k].sort_index;
@ -3213,7 +3239,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
ts = arg_temp(arg);
/* ENV should not be modified. */
tcg_debug_assert(!ts->fixed_reg);
tcg_debug_assert(ts->kind != TEMP_FIXED);
if (arg_ct->oalias && !const_args[arg_ct->alias_index]) {
reg = new_args[arg_ct->alias_index];
@ -3254,7 +3280,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
ts = arg_temp(op->args[i]);
/* ENV should not be modified. */
tcg_debug_assert(!ts->fixed_reg);
tcg_debug_assert(ts->kind != TEMP_FIXED);
if (NEED_SYNC_ARG(i)) {
temp_sync(s, ts, o_allocated_regs, 0, IS_DEAD_ARG(i));
@ -3386,7 +3412,7 @@ static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
ts = arg_temp(arg);
/* ENV should not be modified. */
tcg_debug_assert(!ts->fixed_reg);
tcg_debug_assert(ts->kind != TEMP_FIXED);
reg = tcg_target_call_oarg_regs[i];
tcg_debug_assert(s->reg_to_temp[reg] == NULL);

20
qemu/tcg/tcg.h
View file

@ -490,23 +490,27 @@ typedef enum TCGTempVal {
TEMP_VAL_CONST,
} TCGTempVal;
typedef enum TCGTempKind {
/* Temp is dead at the end of all basic blocks. */
TEMP_NORMAL,
/* Temp is saved across basic blocks but dead at the end of TBs. */
TEMP_LOCAL,
/* Temp is saved across both basic blocks and translation blocks. */
TEMP_GLOBAL,
/* Temp is in a fixed register. */
TEMP_FIXED,
} TCGTempKind;
typedef struct TCGTemp {
TCGReg reg:8;
TCGTempVal val_type:8;
TCGType base_type:8;
TCGType type:8;
unsigned int fixed_reg:1;
TCGTempKind kind:3;
unsigned int indirect_reg:1;
unsigned int indirect_base:1;
unsigned int mem_coherent:1;
unsigned int mem_allocated:1;
/* If true, the temp is saved across both basic blocks and
translation blocks. */
unsigned int temp_global:1;
/* If true, the temp is saved across basic blocks but dead
at the end of translation blocks. If false, the temp is
dead at the end of basic blocks. */
unsigned int temp_local:1;
unsigned int temp_allocated:1;
tcg_target_long val;