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fixed dead global variable update

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4512 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-21 16:24:20 +00:00
parent 839bca8467
commit e5097dc8e3
1 changed files with 18 additions and 20 deletions
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38
tcg/tcg.c
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@ -1293,10 +1293,9 @@ static int tcg_reg_alloc(TCGContext *s, TCGRegSet reg1, TCGRegSet reg2)
tcg_abort();
}
/* at the end of a basic block, we assume all temporaries are dead and
all globals are stored at their canonical location */
/* XXX: optimize by handling constants in another array ? */
void tcg_reg_alloc_bb_end(TCGContext *s)
/* save globals to their cannonical location and assume they can be
modified be the following code. */
static void save_globals(TCGContext *s)
{
TCGTemp *ts;
int i;
@ -1306,9 +1305,22 @@ void tcg_reg_alloc_bb_end(TCGContext *s)
if (!ts->fixed_reg) {
if (ts->val_type == TEMP_VAL_REG) {
tcg_reg_free(s, ts->reg);
} else if (ts->val_type == TEMP_VAL_DEAD) {
ts->val_type = TEMP_VAL_MEM;
}
}
}
}
/* at the end of a basic block, we assume all temporaries are dead and
all globals are stored at their canonical location */
/* XXX: optimize by handling constants in another array ? */
void tcg_reg_alloc_bb_end(TCGContext *s)
{
TCGTemp *ts;
int i;
save_globals(s);
for(i = s->nb_globals; i < s->nb_temps; i++) {
ts = &s->temps[i];
@ -1481,14 +1493,7 @@ static void tcg_reg_alloc_op(TCGContext *s,
/* store globals and free associated registers (we assume the insn
can modify any global. */
for(i = 0; i < s->nb_globals; i++) {
ts = &s->temps[i];
if (!ts->fixed_reg) {
if (ts->val_type == TEMP_VAL_REG) {
tcg_reg_free(s, ts->reg);
}
}
}
save_globals(s);
}
/* satisfy the output constraints */
@ -1680,14 +1685,7 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
/* store globals and free associated registers (we assume the call
can modify any global. */
for(i = 0; i < s->nb_globals; i++) {
ts = &s->temps[i];
if (!ts->fixed_reg) {
if (ts->val_type == TEMP_VAL_REG) {
tcg_reg_free(s, ts->reg);
}
}
}
save_globals(s);
tcg_out_op(s, opc, &func_arg, &const_func_arg);