diff options
Diffstat (limited to 'include/llvm/CodeGen')
| -rw-r--r-- | include/llvm/CodeGen/RegisterScavenging.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/llvm/CodeGen/RegisterScavenging.h b/include/llvm/CodeGen/RegisterScavenging.h index 458c2e4487..a4ed0129eb 100644 --- a/include/llvm/CodeGen/RegisterScavenging.h +++ b/include/llvm/CodeGen/RegisterScavenging.h @@ -69,6 +69,10 @@ class RegScavenger { /// available, unset means the register is currently being used. BitVector RegsAvailable; + /// ImplicitDefed - If bit is set that means the register is defined by an + /// implicit_def instructions. That means it can be clobbered at will. + BitVector ImplicitDefed; + /// CurrDist - Distance from MBB entry to the current instruction MBBI. /// unsigned CurrDist; @@ -113,18 +117,25 @@ public: bool isUsed(unsigned Reg) const { return !RegsAvailable[Reg]; } bool isUnused(unsigned Reg) const { return RegsAvailable[Reg]; } + bool isImplicitlyDefined(unsigned Reg) const { return ImplicitDefed[Reg]; } + /// getRegsUsed - return all registers currently in use in used. void getRegsUsed(BitVector &used, bool includeReserved); /// setUsed / setUnused - Mark the state of one or a number of registers. /// - void setUsed(unsigned Reg); - void setUsed(BitVector &Regs) { + void setUsed(unsigned Reg, bool ImpDef = false); + void setUsed(BitVector &Regs, bool ImpDef = false) { RegsAvailable &= ~Regs; + if (ImpDef) + ImplicitDefed |= Regs; + else + ImplicitDefed &= ~Regs; } void setUnused(unsigned Reg, const MachineInstr *MI); void setUnused(BitVector &Regs) { RegsAvailable |= Regs; + ImplicitDefed &= ~Regs; } /// FindUnusedReg - Find a unused register of the specified register class |