diff options
Diffstat (limited to 'lib/CodeGen/SimpleRegisterCoalescing.h')
-rw-r--r-- | lib/CodeGen/SimpleRegisterCoalescing.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h index 41d1dfb..39c9071 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.h +++ b/lib/CodeGen/SimpleRegisterCoalescing.h @@ -223,6 +223,13 @@ namespace llvm { bool isProfitableToCoalesceToSubRC(unsigned SrcReg, unsigned DstReg, MachineBasicBlock *MBB); + /// HasIncompatibleSubRegDefUse - If we are trying to coalesce a virtual + /// register with a physical register, check if any of the virtual register + /// operand is a sub-register use or def. If so, make sure it won't result + /// in an illegal extract_subreg or insert_subreg instruction. + bool HasIncompatibleSubRegDefUse(MachineInstr *CopyMI, + unsigned VirtReg, unsigned PhysReg); + /// RangeIsDefinedByCopyFromReg - Return true if the specified live range of /// the specified live interval is defined by a copy from the specified /// register. |