diff options
Diffstat (limited to 'lib/CodeGen/PHIElimination.cpp')
| -rw-r--r-- | lib/CodeGen/PHIElimination.cpp | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index 4a23eb257d..11835cb30c 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/lib/CodeGen/PHIElimination.cpp @@ -87,12 +87,11 @@ bool PNE::EliminatePHINodes(MachineFunction &MF, MachineBasicBlock &MBB) { MachineInstr *PHICopy = *(AfterPHIsIt-1); // Add information to LiveVariables to know that the incoming value is - // dead. This says that the register is dead, not killed, because we - // cannot use the live variable information to indicate that the variable - // is defined in multiple entry blocks. Instead, we pretend that this - // instruction defined it and killed it at the same time. + // killed. Note that because the value is defined in several places (once + // each for each incoming block), the "def" block and instruction fields + // for the VarInfo is not filled in. // - LV->addVirtualRegisterDead(IncomingReg, &MBB, PHICopy); + LV->addVirtualRegisterKilled(IncomingReg, &MBB, PHICopy); // Since we are going to be deleting the PHI node, if it is the last use // of any registers, or if the value itself is dead, we need to move this |