Record the number of times a temporary is forced into memory
and the store would not have been required if there an infinite
number of call-saved cpu registers available. This excludes
stores that are required by semantics to return computed values
to their home slot in ENV, i.e. NEED_SYNC_ARG.
To be copied into TBStatistics when desired.
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
include/tcg/tcg.h | 1 +
tcg/tcg.c | 36 +++++++++++++++++++++++-------------
2 files changed, 24 insertions(+), 13 deletions(-)
diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index d60349878f..c2b1a2e187 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -567,6 +567,7 @@ struct TCGContext {
/* Used by TBStatistics */
int orig_nb_ops;
int nb_deleted_ops;
+ int nb_spills;
/* Exit to translator on overflow. */
sigjmp_buf jmp_trans;
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 60be2f429c..471e5eaad9 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1495,6 +1495,7 @@ void tcg_func_start(TCGContext *s)
s->nb_ops = 0;
s->nb_labels = 0;
s->nb_deleted_ops = 0;
+ s->nb_spills = 0;
s->current_frame_offset = s->frame_start;
#ifdef CONFIG_DEBUG_TCG
@@ -4118,8 +4119,11 @@ static inline void temp_dead(TCGContext *s, TCGTemp *ts)
is non-zero, subsequently release the temporary; if it is positive, the
temp is dead; if it is negative, the temp is free. */
static void temp_sync(TCGContext *s, TCGTemp *ts, TCGRegSet allocated_regs,
- TCGRegSet preferred_regs, int free_or_dead)
+ TCGRegSet preferred_regs, int free_or_dead,
+ bool account_spill)
{
+ bool did_spill = false;
+
if (!temp_readonly(ts) && !ts->mem_coherent) {
if (!ts->mem_allocated) {
temp_allocate_frame(s, ts);
@@ -4132,6 +4136,7 @@ static void temp_sync(TCGContext *s, TCGTemp *ts,
TCGRegSet allocated_regs,
if (free_or_dead
&& tcg_out_sti(s, ts->type, ts->val,
ts->mem_base->reg, ts->mem_offset)) {
+ did_spill = account_spill;
break;
}
temp_load(s, ts, tcg_target_available_regs[ts->type],
@@ -4139,6 +4144,7 @@ static void temp_sync(TCGContext *s, TCGTemp *ts,
TCGRegSet allocated_regs,
/* fallthrough */
case TEMP_VAL_REG:
+ did_spill = account_spill;
tcg_out_st(s, ts->type, ts->reg,
ts->mem_base->reg, ts->mem_offset);
break;
@@ -4155,6 +4161,9 @@ static void temp_sync(TCGContext *s, TCGTemp *ts,
TCGRegSet allocated_regs,
if (free_or_dead) {
temp_free_or_dead(s, ts, free_or_dead);
}
+ if (did_spill) {
+ s->nb_spills += 1;
+ }
}
/* free register 'reg' by spilling the corresponding temporary if necessary */
@@ -4162,7 +4171,7 @@ static void tcg_reg_free(TCGContext *s, TCGReg reg,
TCGRegSet allocated_regs)
{
TCGTemp *ts = s->reg_to_temp[reg];
if (ts != NULL) {
- temp_sync(s, ts, allocated_regs, 0, -1);
+ temp_sync(s, ts, allocated_regs, 0, -1, true);
}
}
@@ -4442,7 +4451,8 @@ static void tcg_reg_alloc_do_movi(TCGContext *s, TCGTemp
*ots,
ots->val = val;
ots->mem_coherent = 0;
if (NEED_SYNC_ARG(0)) {
- temp_sync(s, ots, s->reserved_regs, preferred_regs, IS_DEAD_ARG(0));
+ temp_sync(s, ots, s->reserved_regs, preferred_regs,
+ IS_DEAD_ARG(0), false);
} else if (IS_DEAD_ARG(0)) {
temp_dead(s, ots);
}
@@ -4544,7 +4554,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp
*op)
ots->mem_coherent = 0;
if (NEED_SYNC_ARG(0)) {
- temp_sync(s, ots, allocated_regs, 0, 0);
+ temp_sync(s, ots, allocated_regs, 0, 0, false);
}
}
@@ -4621,7 +4631,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp
*op)
break;
}
/* Sync the temp back to its slot and load from there. */
- temp_sync(s, its, s->reserved_regs, 0, 0);
+ temp_sync(s, its, s->reserved_regs, 0, 0, true);
}
/* fall through */
@@ -4652,7 +4662,7 @@ static void tcg_reg_alloc_dup(TCGContext *s, const TCGOp
*op)
temp_dead(s, its);
}
if (NEED_SYNC_ARG(0)) {
- temp_sync(s, ots, s->reserved_regs, 0, 0);
+ temp_sync(s, ots, s->reserved_regs, 0, 0, false);
}
if (IS_DEAD_ARG(0)) {
temp_dead(s, ots);
@@ -4870,7 +4880,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp
*op)
* Cross register class move not supported. Sync the
* temp back to its slot and load from there.
*/
- temp_sync(s, ts, i_allocated_regs, 0, 0);
+ temp_sync(s, ts, i_allocated_regs, 0, 0, true);
tcg_out_ld(s, ts->type, reg,
ts->mem_base->reg, ts->mem_offset);
}
@@ -5019,7 +5029,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp
*op)
tcg_debug_assert(!temp_readonly(ts));
if (NEED_SYNC_ARG(i)) {
- temp_sync(s, ts, o_allocated_regs, 0, IS_DEAD_ARG(i));
+ temp_sync(s, ts, o_allocated_regs, 0, IS_DEAD_ARG(i), false);
} else if (IS_DEAD_ARG(i)) {
temp_dead(s, ts);
}
@@ -5086,8 +5096,8 @@ static bool tcg_reg_alloc_dup2(TCGContext *s, const TCGOp
*op)
itsl == itsh + (HOST_BIG_ENDIAN ? 1 : -1)) {
TCGTemp *its = itsl - HOST_BIG_ENDIAN;
- temp_sync(s, its + 0, s->reserved_regs, 0, 0);
- temp_sync(s, its + 1, s->reserved_regs, 0, 0);
+ temp_sync(s, its + 0, s->reserved_regs, 0, 0, true);
+ temp_sync(s, its + 1, s->reserved_regs, 0, 0, true);
if (tcg_out_dupm_vec(s, vtype, MO_64, ots->reg,
its->mem_base->reg, its->mem_offset)) {
@@ -5107,7 +5117,7 @@ static bool tcg_reg_alloc_dup2(TCGContext *s, const TCGOp
*op)
temp_dead(s, itsh);
}
if (NEED_SYNC_ARG(0)) {
- temp_sync(s, ots, s->reserved_regs, 0, IS_DEAD_ARG(0));
+ temp_sync(s, ots, s->reserved_regs, 0, IS_DEAD_ARG(0), false);
} else if (IS_DEAD_ARG(0)) {
temp_dead(s, ots);
}
@@ -5125,7 +5135,7 @@ static void load_arg_reg(TCGContext *s, TCGReg reg,
TCGTemp *ts,
* Cross register class move not supported. Sync the
* temp back to its slot and load from there.
*/
- temp_sync(s, ts, allocated_regs, 0, 0);
+ temp_sync(s, ts, allocated_regs, 0, 0, true);
tcg_out_ld(s, ts->type, reg,
ts->mem_base->reg, ts->mem_offset);
}
@@ -5307,7 +5317,7 @@ static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
for (i = 0; i < nb_oargs; i++) {
TCGTemp *ts = arg_temp(op->args[i]);
if (NEED_SYNC_ARG(i)) {
- temp_sync(s, ts, s->reserved_regs, 0, IS_DEAD_ARG(i));
+ temp_sync(s, ts, s->reserved_regs, 0, IS_DEAD_ARG(i), false);
} else if (IS_DEAD_ARG(i)) {
temp_dead(s, ts);
}
--
2.34.1
