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tcg: Use output_pref wrapper function 

We will shortly have the possibility of more that two outputs,
though only for calls (for which preferences are moot).  Avoid
direct references to op->output_pref[] when possible.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-11 15:10:51 +10:00
parent cb10bc63b7
commit 31fd884b2e
2 changed files with 23 additions and 16 deletions
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5
include/tcg/tcg.h
View File

@ -518,6 +518,11 @@ typedef struct TCGOp {
/* Make sure operands fit in the bitfields above. */
QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8));
static inline TCGRegSet output_pref(const TCGOp *op, unsigned i)
{
return i < ARRAY_SIZE(op->output_pref) ? op->output_pref[i] : 0;
}
typedef struct TCGProfile {
int64_t cpu_exec_time;
int64_t tb_count1;

34
tcg/tcg.c
View File

@ -1966,7 +1966,7 @@ static void tcg_dump_ops(TCGContext *s, FILE *f, bool have_prefs)
if (have_prefs) {
for (i = 0; i < nb_oargs; ++i) {
TCGRegSet set = op->output_pref[i];
TCGRegSet set = output_pref(op, i);
if (i == 0) {
ne_fprintf(f, " pref=");
@ -2636,11 +2636,11 @@ static void liveness_pass_1(TCGContext *s)
}
ts->state = TS_DEAD;
la_reset_pref(ts);
/* Not used -- it will be tcg_target_call_oarg_regs[i]. */
op->output_pref[i] = 0;
}
/* Not used -- it will be tcg_target_call_oarg_reg(). */
memset(op->output_pref, 0, sizeof(op->output_pref));
if (!(call_flags & (TCG_CALL_NO_WRITE_GLOBALS |
TCG_CALL_NO_READ_GLOBALS))) {
la_global_kill(s, nb_globals);
@ -2802,7 +2802,9 @@ static void liveness_pass_1(TCGContext *s)
ts = arg_temp(op->args[i]);
/* Remember the preference of the uses that followed. */
op->output_pref[i] = *la_temp_pref(ts);
if (i < ARRAY_SIZE(op->output_pref)) {
op->output_pref[i] = *la_temp_pref(ts);
}
/* Output args are dead. */
if (ts->state & TS_DEAD) {
@ -2872,7 +2874,7 @@ static void liveness_pass_1(TCGContext *s)
set &= ct->regs;
if (ct->ialias) {
set &= op->output_pref[ct->alias_index];
set &= output_pref(op, ct->alias_index);
}
/* If the combination is not possible, restart. */
if (set == 0) {
@ -3539,7 +3541,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp *op)
TCGReg oreg, ireg;
allocated_regs = s->reserved_regs;
preferred_regs = op->output_pref[0];
preferred_regs = output_pref(op, 0);
ots = arg_temp(op->args[0]);
ts = arg_temp(op->args[1]);
@ -3656,7 +3658,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp *op)
if (IS_DEAD_ARG(1)) {
temp_dead(s, its);
}
tcg_reg_alloc_do_movi(s, ots, val, arg_life, op->output_pref[0]);
tcg_reg_alloc_do_movi(s, ots, val, arg_life, output_pref(op, 0));
return;
}
@ -3673,7 +3675,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp *op)
tcg_regset_set_reg(allocated_regs, its->reg);
}
oreg = tcg_reg_alloc(s, dup_out_regs, allocated_regs,
op->output_pref[0], ots->indirect_base);
output_pref(op, 0), ots->indirect_base);
set_temp_val_reg(s, ots, oreg);
}
@ -3792,7 +3794,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
switch (arg_ct->pair) {
case 0: /* not paired */
if (arg_ct->ialias) {
i_preferred_regs = op->output_pref[arg_ct->alias_index];
i_preferred_regs = output_pref(op, arg_ct->alias_index);
/*
* If the input is readonly, then it cannot also be an
@ -3841,7 +3843,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
* and to identify a few cases where it's not required.
*/
if (arg_ct->ialias) {
i_preferred_regs = op->output_pref[arg_ct->alias_index];
i_preferred_regs = output_pref(op, arg_ct->alias_index);
if (IS_DEAD_ARG(i1) &&
IS_DEAD_ARG(i2) &&
!temp_readonly(ts) &&
@ -3877,7 +3879,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
case 3: /* ialias with second output, no first input */
tcg_debug_assert(arg_ct->ialias);
i_preferred_regs = op->output_pref[arg_ct->alias_index];
i_preferred_regs = output_pref(op, arg_ct->alias_index);
if (IS_DEAD_ARG(i) &&
!temp_readonly(ts) &&
@ -4001,10 +4003,10 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
} else if (arg_ct->newreg) {
reg = tcg_reg_alloc(s, arg_ct->regs,
i_allocated_regs | o_allocated_regs,
op->output_pref[k], ts->indirect_base);
output_pref(op, k), ts->indirect_base);
} else {
reg = tcg_reg_alloc(s, arg_ct->regs, o_allocated_regs,
op->output_pref[k], ts->indirect_base);
output_pref(op, k), ts->indirect_base);
}
break;
@ -4015,7 +4017,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
break;
}
reg = tcg_reg_alloc_pair(s, arg_ct->regs, o_allocated_regs,
op->output_pref[k], ts->indirect_base);
output_pref(op, k), ts->indirect_base);
break;
case 2: /* second of pair */
@ -4098,7 +4100,7 @@ static bool tcg_reg_alloc_dup2(TCGContext *s, const TCGOp *op)
}
oreg = tcg_reg_alloc(s, dup_out_regs, allocated_regs,
op->output_pref[0], ots->indirect_base);
output_pref(op, 0), ots->indirect_base);
set_temp_val_reg(s, ots, oreg);
}