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Propagate a few more LiveRange properties to LiveValue.

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The live value tracker goes through the trouble of looking up the live
range for each value it tracks. We can cache a few more interesting
properties from the live range in the LiveValue struct.
This commit is contained in:
Jakob Stoklund Olesen
2017-05-11 11:03:18 -07:00
parent 5ff2257b12
commit 9d4e23d894
1 changed files with 15 additions and 6 deletions
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21
lib/cretonne/src/regalloc/live_value_tracker.rs
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@@ -11,6 +11,7 @@ use ir::{Inst, Ebb, Value, DataFlowGraph, ProgramOrder, ExpandedProgramPoint};
use partition_slice::partition_slice;
use regalloc::affinity::Affinity;
use regalloc::liveness::Liveness;
use regalloc::liverange::LiveRange;
use std::collections::HashMap;
@@ -45,6 +46,12 @@ pub struct LiveValue {
/// This value is simply a copy of the affinity stored in the live range. We copy it because
/// almost all users of `LiveValue` need to look at it.
pub affinity: Affinity,
/// The live range for this value never leaves its EBB.
pub is_local: bool,
/// This value is dead - the live range ends immediately.
pub is_dead: bool,
}
struct LiveValueVec {
@@ -66,13 +73,15 @@ impl LiveValueVec {
}
}
/// Add a new live value to `values`.
fn push(&mut self, value: Value, endpoint: Inst, affinity: Affinity) {
/// Add a new live value to `values`. Copy some properties from `lr`.
fn push(&mut self, value: Value, endpoint: Inst, lr: &LiveRange) {
self.values
.push(LiveValue {
value,
endpoint,
affinity,
affinity: lr.affinity,
is_local: lr.is_local(),
is_dead: lr.is_dead(),
});
}
@@ -175,7 +184,7 @@ impl LiveValueTracker {
// Check if this value is live-in here.
if let Some(endpoint) = lr.livein_local_end(ebb, program_order) {
self.live.push(value, endpoint, lr.affinity);
self.live.push(value, endpoint, lr);
}
}
}
@@ -189,7 +198,7 @@ impl LiveValueTracker {
assert_eq!(lr.def(), ebb.into());
match lr.def_local_end().into() {
ExpandedProgramPoint::Inst(endpoint) => {
self.live.push(value, endpoint, lr.affinity);
self.live.push(value, endpoint, lr);
}
ExpandedProgramPoint::Ebb(local_ebb) => {
// This is a dead EBB argument which is not even live into the first
@@ -248,7 +257,7 @@ impl LiveValueTracker {
assert_eq!(lr.def(), inst.into());
match lr.def_local_end().into() {
ExpandedProgramPoint::Inst(endpoint) => {
self.live.push(value, endpoint, lr.affinity);
self.live.push(value, endpoint, lr);
}
ExpandedProgramPoint::Ebb(ebb) => {
panic!("Instruction result live range can't end at {}", ebb);