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tcg: Reference count labels 

Increment when adding branches, and decrement when removing them.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-11-26 12:47:28 -08:00
parent 15d7409260
commit d88a117eaa
4 changed files with 25 additions and 1 deletions
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2
tcg/tcg-op.c
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@ -240,6 +240,7 @@ void tcg_gen_brcond_i32(TCGCond cond, TCGv_i32 arg1, TCGv_i32 arg2, TCGLabel *l)
if (cond == TCG_COND_ALWAYS) {
tcg_gen_br(l);
} else if (cond != TCG_COND_NEVER) {
l->refs++;
tcg_gen_op4ii_i32(INDEX_op_brcond_i32, arg1, arg2, cond, label_arg(l));
}
}
@ -1405,6 +1406,7 @@ void tcg_gen_brcond_i64(TCGCond cond, TCGv_i64 arg1, TCGv_i64 arg2, TCGLabel *l)
if (cond == TCG_COND_ALWAYS) {
tcg_gen_br(l);
} else if (cond != TCG_COND_NEVER) {
l->refs++;
if (TCG_TARGET_REG_BITS == 32) {
tcg_gen_op6ii_i32(INDEX_op_brcond2_i32, TCGV_LOW(arg1),
TCGV_HIGH(arg1), TCGV_LOW(arg2),

1
tcg/tcg-op.h
View File

@ -260,6 +260,7 @@ static inline void gen_set_label(TCGLabel *l)
static inline void tcg_gen_br(TCGLabel *l)
{
l->refs++;
tcg_gen_op1(INDEX_op_br, label_arg(l));
}

20
tcg/tcg.c
View File

@ -2171,6 +2171,26 @@ static void process_op_defs(TCGContext *s)
void tcg_op_remove(TCGContext *s, TCGOp *op)
{
TCGLabel *label;
switch (op->opc) {
case INDEX_op_br:
label = arg_label(op->args[0]);
label->refs--;
break;
case INDEX_op_brcond_i32:
case INDEX_op_brcond_i64:
label = arg_label(op->args[3]);
label->refs--;
break;
case INDEX_op_brcond2_i32:
label = arg_label(op->args[5]);
label->refs--;
break;
default:
break;
}
QTAILQ_REMOVE(&s->ops, op, link);
QTAILQ_INSERT_TAIL(&s->free_ops, op, link);
s->nb_ops--;

3
tcg/tcg.h
View File

@ -244,7 +244,8 @@ typedef struct TCGRelocation {
typedef struct TCGLabel {
unsigned has_value : 1;
unsigned id : 31;
unsigned id : 15;
unsigned refs : 16;
union {
uintptr_t value;
tcg_insn_unit *value_ptr;