bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

introduce apply helper that applies a DefUse set to live bits

Browse source
This commit is contained in:
Niko Matsakis 2017-10-24 11:57:22 -04:00
parent bd2511652f
commit ea03a43fe6
1 changed files with 7 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

9
src/librustc_mir/util/liveness.rs
View file

@ -54,6 +54,10 @@ struct DefsUses {
}
impl DefsUses {
fn apply(&self, bits: &mut LocalSet) -> bool {
bits.subtract(&self.defs) | bits.union(&self.uses)
}
fn add_def(&mut self, index: Local) {
// If it was used already in the block, remove that use
// now that we found a definition.
@ -194,8 +198,9 @@ pub fn liveness_of_locals<'tcx>(mir: &Mir<'tcx>) -> LivenessResult {
// in = use ∪ (out - def)
ins[b].clone_from(&outs[b]);
ins[b].subtract(&def_use[b].defs);
ins[b].union(&def_use[b].uses);
// FIXME use the return value to detect if we have changed things
def_use[b].apply(&mut ins[b]);
}
if ins_ == ins && outs_ == outs {