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tcg: replace op_dead_iargs by op_dead_args 

Allow all args to be dead by replacing the input specific op_dead_iargs
variable by op_dead_args. Note this is a purely mechanical change.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2011-05-17 18:25:45 +02:00
parent 6eba5c82cf
commit 866cb6cb21
2 changed files with 38 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
tcg/tcg.c
View File

@ -1193,7 +1193,7 @@ static inline void tcg_la_bb_end(TCGContext *s, uint8_t *dead_temps)
}
}
/* Liveness analysis : update the opc_dead_iargs array to tell if a
/* Liveness analysis : update the opc_dead_args array to tell if a
given input arguments is dead. Instructions updating dead
temporaries are removed. */
static void tcg_liveness_analysis(TCGContext *s)
@ -1203,13 +1203,13 @@ static void tcg_liveness_analysis(TCGContext *s)
TCGArg *args;
const TCGOpDef *def;
uint8_t *dead_temps;
unsigned int dead_iargs;
unsigned int dead_args;
gen_opc_ptr++; /* skip end */
nb_ops = gen_opc_ptr - gen_opc_buf;
s->op_dead_iargs = tcg_malloc(nb_ops * sizeof(uint16_t));
s->op_dead_args = tcg_malloc(nb_ops * sizeof(uint16_t));
dead_temps = tcg_malloc(s->nb_temps);
memset(dead_temps, 1, s->nb_temps);
@ -1256,17 +1256,17 @@ static void tcg_liveness_analysis(TCGContext *s)
}
/* input args are live */
dead_iargs = 0;
for(i = 0; i < nb_iargs; i++) {
arg = args[i + nb_oargs];
dead_args = 0;
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
arg = args[i];
if (arg != TCG_CALL_DUMMY_ARG) {
if (dead_temps[arg]) {
dead_iargs |= (1 << i);
dead_args |= (1 << i);
}
dead_temps[arg] = 0;
}
}
s->op_dead_iargs[op_index] = dead_iargs;
s->op_dead_args[op_index] = dead_args;
}
args--;
}
@ -1327,15 +1327,15 @@ static void tcg_liveness_analysis(TCGContext *s)
}
/* input args are live */
dead_iargs = 0;
for(i = 0; i < nb_iargs; i++) {
arg = args[i + nb_oargs];
dead_args = 0;
for(i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
arg = args[i];
if (dead_temps[arg]) {
dead_iargs |= (1 << i);
dead_args |= (1 << i);
}
dead_temps[arg] = 0;
}
s->op_dead_iargs[op_index] = dead_iargs;
s->op_dead_args[op_index] = dead_args;
}
break;
}
@ -1352,8 +1352,8 @@ static void tcg_liveness_analysis(TCGContext *s)
int nb_ops;
nb_ops = gen_opc_ptr - gen_opc_buf;
s->op_dead_iargs = tcg_malloc(nb_ops * sizeof(uint16_t));
memset(s->op_dead_iargs, 0, nb_ops * sizeof(uint16_t));
s->op_dead_args = tcg_malloc(nb_ops * sizeof(uint16_t));
memset(s->op_dead_args, 0, nb_ops * sizeof(uint16_t));
}
#endif
@ -1557,7 +1557,7 @@ static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs)
save_globals(s, allocated_regs);
}
#define IS_DEAD_IARG(n) ((dead_iargs >> (n)) & 1)
#define IS_DEAD_ARG(n) ((dead_args >> (n)) & 1)
static void tcg_reg_alloc_movi(TCGContext *s, const TCGArg *args)
{
@ -1582,7 +1582,7 @@ static void tcg_reg_alloc_movi(TCGContext *s, const TCGArg *args)
static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
const TCGArg *args,
unsigned int dead_iargs)
unsigned int dead_args)
{
TCGTemp *ts, *ots;
int reg;
@ -1592,9 +1592,9 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
ts = &s->temps[args[1]];
arg_ct = &def->args_ct[0];
/* XXX: always mark arg dead if IS_DEAD_IARG(0) */
/* XXX: always mark arg dead if IS_DEAD_ARG(1) */
if (ts->val_type == TEMP_VAL_REG) {
if (IS_DEAD_IARG(0) && !ts->fixed_reg && !ots->fixed_reg) {
if (IS_DEAD_ARG(1) && !ts->fixed_reg && !ots->fixed_reg) {
/* the mov can be suppressed */
if (ots->val_type == TEMP_VAL_REG)
s->reg_to_temp[ots->reg] = -1;
@ -1642,7 +1642,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def,
static void tcg_reg_alloc_op(TCGContext *s,
const TCGOpDef *def, TCGOpcode opc,
const TCGArg *args,
unsigned int dead_iargs)
unsigned int dead_args)
{
TCGRegSet allocated_regs;
int i, k, nb_iargs, nb_oargs, reg;
@ -1701,10 +1701,11 @@ static void tcg_reg_alloc_op(TCGContext *s,
/* if the input is aliased to an output and if it is
not dead after the instruction, we must allocate
a new register and move it */
if (!IS_DEAD_IARG(i - nb_oargs))
if (!IS_DEAD_ARG(i)) {
goto allocate_in_reg;
}
}
}
reg = ts->reg;
if (tcg_regset_test_reg(arg_ct->u.regs, reg)) {
/* nothing to do : the constraint is satisfied */
@ -1725,9 +1726,9 @@ static void tcg_reg_alloc_op(TCGContext *s,
tcg_reg_alloc_bb_end(s, allocated_regs);
} else {
/* mark dead temporaries and free the associated registers */
for(i = 0; i < nb_iargs; i++) {
arg = args[nb_oargs + i];
if (IS_DEAD_IARG(i)) {
for(i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
arg = args[i];
if (IS_DEAD_ARG(i)) {
ts = &s->temps[arg];
if (!ts->fixed_reg) {
if (ts->val_type == TEMP_VAL_REG)
@ -1808,7 +1809,7 @@ static void tcg_reg_alloc_op(TCGContext *s,
static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
TCGOpcode opc, const TCGArg *args,
unsigned int dead_iargs)
unsigned int dead_args)
{
int nb_iargs, nb_oargs, flags, nb_regs, i, reg, nb_params;
TCGArg arg, func_arg;
@ -1930,9 +1931,9 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
/* mark dead temporaries and free the associated registers */
for(i = 0; i < nb_iargs; i++) {
arg = args[nb_oargs + i];
if (IS_DEAD_IARG(i)) {
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
arg = args[i];
if (IS_DEAD_ARG(i)) {
ts = &s->temps[arg];
if (!ts->fixed_reg) {
if (ts->val_type == TEMP_VAL_REG)
@ -2007,7 +2008,7 @@ static inline int tcg_gen_code_common(TCGContext *s, uint8_t *gen_code_buf,
TCGOpcode opc;
int op_index;
const TCGOpDef *def;
unsigned int dead_iargs;
unsigned int dead_args;
const TCGArg *args;
#ifdef DEBUG_DISAS
@ -2058,8 +2059,8 @@ static inline int tcg_gen_code_common(TCGContext *s, uint8_t *gen_code_buf,
#if TCG_TARGET_REG_BITS == 64
case INDEX_op_mov_i64:
#endif
dead_iargs = s->op_dead_iargs[op_index];
tcg_reg_alloc_mov(s, def, args, dead_iargs);
dead_args = s->op_dead_args[op_index];
tcg_reg_alloc_mov(s, def, args, dead_args);
break;
case INDEX_op_movi_i32:
#if TCG_TARGET_REG_BITS == 64
@ -2095,8 +2096,8 @@ static inline int tcg_gen_code_common(TCGContext *s, uint8_t *gen_code_buf,
tcg_out_label(s, args[0], (long)s->code_ptr);
break;
case INDEX_op_call:
dead_iargs = s->op_dead_iargs[op_index];
args += tcg_reg_alloc_call(s, def, opc, args, dead_iargs);
dead_args = s->op_dead_args[op_index];
args += tcg_reg_alloc_call(s, def, opc, args, dead_args);
goto next;
case INDEX_op_end:
goto the_end;
@ -2104,8 +2105,8 @@ static inline int tcg_gen_code_common(TCGContext *s, uint8_t *gen_code_buf,
/* Note: in order to speed up the code, it would be much
faster to have specialized register allocator functions for
some common argument patterns */
dead_iargs = s->op_dead_iargs[op_index];
tcg_reg_alloc_op(s, def, opc, args, dead_iargs);
dead_args = s->op_dead_args[op_index];
tcg_reg_alloc_op(s, def, opc, args, dead_args);
break;
}
args += def->nb_args;

4
tcg/tcg.h
View File

@ -286,8 +286,8 @@ struct TCGContext {
uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */
/* liveness analysis */
uint16_t *op_dead_iargs; /* for each operation, each bit tells if the
corresponding input argument is dead */
uint16_t *op_dead_args; /* for each operation, each bit tells if the
corresponding argument is dead */
/* tells in which temporary a given register is. It does not take
into account fixed registers */