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-rw-r--r--llvm/lib/CodeGen/LiveRangeCalc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/LiveRangeCalc.h b/llvm/lib/CodeGen/LiveRangeCalc.h
index 84cc1cb2be7..892f535a5ae 100644
--- a/llvm/lib/CodeGen/LiveRangeCalc.h
+++ b/llvm/lib/CodeGen/LiveRangeCalc.h
@@ -160,6 +160,7 @@ class LiveRangeCalc {
/// all uses must be jointly dominated by the definitions from @p LR
/// together with definitions of other lanes where @p LR becomes undefined
/// (via <def,read-undef> operands).
+ /// If @p LR is a main range, the @p LaneMask should be set to ~0.
void extendToUses(LiveRange &LR, unsigned Reg, LaneBitmask LaneMask,
LiveInterval *LI = nullptr);
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