diff options
Diffstat (limited to 'llvm/include/llvm/CodeGen/LivePhysRegs.h')
| -rw-r--r-- | llvm/include/llvm/CodeGen/LivePhysRegs.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/llvm/include/llvm/CodeGen/LivePhysRegs.h b/llvm/include/llvm/CodeGen/LivePhysRegs.h index 76bb34d270a2..1d40b1cbb0ea 100644 --- a/llvm/include/llvm/CodeGen/LivePhysRegs.h +++ b/llvm/include/llvm/CodeGen/LivePhysRegs.h @@ -193,11 +193,18 @@ void addLiveIns(MachineBasicBlock &MBB, const LivePhysRegs &LiveRegs); void computeAndAddLiveIns(LivePhysRegs &LiveRegs, MachineBasicBlock &MBB); -/// Convenience function for recomputing live-in's for \p MBB. -static inline void recomputeLiveIns(MachineBasicBlock &MBB) { +/// Convenience function for recomputing live-in's for a MBB. Returns true if +/// any changes were made. +static inline bool recomputeLiveIns(MachineBasicBlock &MBB) { LivePhysRegs LPR; + auto oldLiveIns = MBB.getLiveIns(); + MBB.clearLiveIns(); computeAndAddLiveIns(LPR, MBB); + MBB.sortUniqueLiveIns(); + + auto newLiveIns = MBB.getLiveIns(); + return oldLiveIns != newLiveIns; } } // end namespace llvm |