diff options
Diffstat (limited to 'include/llvm/CodeGen')
| -rw-r--r-- | include/llvm/CodeGen/RegisterScavenging.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/include/llvm/CodeGen/RegisterScavenging.h b/include/llvm/CodeGen/RegisterScavenging.h index 08d316992e..8752e67a79 100644 --- a/include/llvm/CodeGen/RegisterScavenging.h +++ b/include/llvm/CodeGen/RegisterScavenging.h @@ -129,10 +129,12 @@ private: /// isReserved - Returns true if a register is reserved. It is never "unused". bool isReserved(unsigned Reg) const { return MRI->isReserved(Reg); } - /// isUsed / isUnused - Test if a register is currently being used. + /// isUsed - Test if a register is currently being used. When called by the + /// isAliasUsed function, we only check isReserved if this is the original + /// register, not an alias register. /// - bool isUsed(unsigned Reg) const { - return !RegsAvailable.test(Reg) || isReserved(Reg); + bool isUsed(unsigned Reg, bool CheckReserved = true) const { + return !RegsAvailable.test(Reg) || (CheckReserved && isReserved(Reg)); } /// isAliasUsed - Is Reg or an alias currently in use? |