diff options
Diffstat (limited to 'compiler/optimizing/ssa_liveness_analysis.h')
| -rw-r--r-- | compiler/optimizing/ssa_liveness_analysis.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/compiler/optimizing/ssa_liveness_analysis.h b/compiler/optimizing/ssa_liveness_analysis.h index 7b98c4eab5..b550d8ad8e 100644 --- a/compiler/optimizing/ssa_liveness_analysis.h +++ b/compiler/optimizing/ssa_liveness_analysis.h @@ -973,7 +973,11 @@ class LiveInterval : public ArenaObject<kArenaAllocMisc> { break; } - size_t back_edge_use_position = current->GetSingleBackEdge()->GetLifetimeEnd(); + // We're only adding a synthesized use at the last back edge. Adding syntehsized uses on + // all back edges is not necessary: anything used in the loop will have its use at the + // last back edge. If we want branches in a loop to have better register allocation than + // another branch, then it is the linear order we should change. + size_t back_edge_use_position = current->GetLifetimeEnd(); if ((first_use_ != nullptr) && (first_use_->GetPosition() <= back_edge_use_position)) { // There was a use already seen in this loop. Therefore the previous call to `AddUse` // already inserted the backedge use. We can stop going outward. |