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Add fixed aliases to a statement's kill set.

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Fixed aliases are those that will never change through the life of the
code. They are generated from structure accesses and thus what they alias
is always known.
This commit is contained in:
Bill Currie 2012-12-10 13:25:06 +09:00
parent 4f70b48370
commit f30741c875
1 changed files with 40 additions and 1 deletions
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41
tools/qfcc/source/flow.c
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@ -373,6 +373,45 @@ flow_build_vars (function_t *func)
set_delete (stdef);
}
static void
flow_kill_aliases (set_t *kill, flowvar_t *var)
{
operand_t *op;
def_t *st_def;
def_t *def;
set_union (kill, var->define);
op = var->op;
if (op->op_type == op_temp) {
if (op->o.tempop.alias) {
op = op->o.tempop.alias;
var = op->o.tempop.flowvar;
if (var)
set_union (kill, var->define);
}
for (op = op->o.tempop.alias_ops; op; op = op->next) {
var = op->o.tempop.flowvar;
if (var)
set_union (kill, var->define);
}
} else if (op->op_type == op_def) {
st_def = def = op->o.def;
if (def->alias) {
def = def->alias;
var = def->flowvar;
if (var)
set_union (kill, var->define);
}
for (def = def->alias_defs; def; def = def->next) {
if (!def_overlap (def, st_def))
continue;
var = def->flowvar;
if (var)
set_union (kill, var->define);
}
}
}
static void
flow_reaching_defs (flowgraph_t *graph)
{
@ -400,7 +439,7 @@ flow_reaching_defs (flowgraph_t *graph)
set_empty (stkill);
for (var_i = set_first (stdef); var_i; var_i = set_next (var_i)) {
var = graph->func->vars[var_i->value];
set_union (stkill, var->define);
flow_kill_aliases (stkill, var);
set_remove (stkill, st->number);
set_add (stgen, st->number);
}