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[qfcc] Use ud- and du-chains for block live analysis

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The ud- and du-chains include known side-effects of the instructions and
thus depict a more accurate view of what operands an instruction uses or
defines. Fixes the arraylife2 test.
This commit is contained in:
Bill Currie 2023-06-05 11:03:44 +09:00
parent a5ed154cfe
commit fb1b3e0869
1 changed files with 20 additions and 1 deletions
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21
tools/qfcc/source/flow.c
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@ -1237,12 +1237,30 @@ flow_live_vars (flowgraph_t *graph)
// first, calculate use and def for each block, and initialize the in and
// out sets.
set_t *node_statements = set_new ();
for (i = 0; i < graph->num_nodes; i++) {
node = graph->nodes[i];
use = set_new ();
def = set_new ();
set_empty (node_statements);
for (st = node->sblock->statements; st; st = st->next) {
flow_analyze_statement (st, stuse, stdef, 0, 0);
set_add (node_statements, st->number);
}
for (st = node->sblock->statements; st; st = st->next) {
set_empty (stuse);
set_empty (stdef);
for (int i = 0; i < st->num_use; i++) {
udchain_t ud = graph->func->ud_chains[st->first_use + i];
if (!set_is_member (node_statements, ud.defst)) {
set_add (stuse, ud.var);
}
}
for (int i = 0; i < st->num_def; i++) {
udchain_t du = graph->func->du_chains[st->first_def + i];
if (!set_is_member (node_statements, du.usest)) {
set_add (stdef, du.var);
}
}
live_set_use (stuse, use, def);
live_set_def (stdef, use, def);
}
@ -1251,6 +1269,7 @@ flow_live_vars (flowgraph_t *graph)
node->live_vars.in = set_new ();
node->live_vars.out = set_new ();
}
set_delete (node_statements);
// create in for the exit dummy block using the global vars used by the
// function
use = set_new ();