Detects dead and undefined subregister lanes across COPY-like instructions.
Declared in <llvm/CodeGen/DetectDeadLanes.h>
class DeadLaneDetector;| Name | Description |
|---|---|
VRegInfo | Contains a bitmask of which lanes of a given virtual register are defined and which ones are actually used. |
| Name | Description |
|---|---|
DeadLaneDetector [constructor] | Construct a detector for the given machine register info. |
computeSubRegisterLaneBitInfo | Update the DefinedLanes and the UsedLanes for all virtual registers. |
getVRegInfo | Return the used/defined lane info for virtual register index RegIdx. |
isDefinedByCopy | Return true if virtual register index RegIdx is defined by a COPY-like instruction. |
transferDefinedLanes | Given a mask DefinedLanes of lanes defined at operand OpNum of COPY-like instruction, determine which lanes are defined at the output operand Def. |
transferUsedLanes | Given a mask UsedLanes used from the output of instruction MI determine which lanes are used from operand MO of this instruction. |