diff options
Diffstat (limited to 'lib/Target/ARM/ARMBaseRegisterInfo.cpp')
-rw-r--r-- | lib/Target/ARM/ARMBaseRegisterInfo.cpp | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp index a8c7657..3f79a9b 100644 --- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp +++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp @@ -245,11 +245,15 @@ ARMBaseRegisterInfo::getRegAllocationHints(unsigned VirtReg, // This register should preferably be even (Odd == 0) or odd (Odd == 1). // Check if the other part of the pair has already been assigned, and provide // the paired register as the first hint. + unsigned Paired = Hint.second; + if (Paired == 0) + return; + unsigned PairedPhys = 0; - if (VRM && VRM->hasPhys(Hint.second)) { - PairedPhys = getPairedGPR(VRM->getPhys(Hint.second), Odd, this); - if (PairedPhys && MRI.isReserved(PairedPhys)) - PairedPhys = 0; + if (TargetRegisterInfo::isPhysicalRegister(Paired)) { + PairedPhys = Paired; + } else if (VRM && VRM->hasPhys(Paired)) { + PairedPhys = getPairedGPR(VRM->getPhys(Paired), Odd, this); } // First prefer the paired physreg. @@ -284,9 +288,14 @@ ARMBaseRegisterInfo::updateRegAllocHint(unsigned Reg, unsigned NewReg, // change. unsigned OtherReg = Hint.second; Hint = MRI->getRegAllocationHint(OtherReg); - if (Hint.second == Reg) - // Make sure the pair has not already divorced. + // Make sure the pair has not already divorced. + if (Hint.second == Reg) { MRI->setRegAllocationHint(OtherReg, Hint.first, NewReg); + if (TargetRegisterInfo::isVirtualRegister(NewReg)) + MRI->setRegAllocationHint(NewReg, + Hint.first == (unsigned)ARMRI::RegPairOdd ? ARMRI::RegPairEven + : ARMRI::RegPairOdd, OtherReg); + } } } |