From 0cb9dd7aa28f091ee8bd0c86a2c7f55f288ac2fb Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 1 Jan 2008 20:36:19 +0000 Subject: switch the register iterator to act more like hte LLVM value iterator: dereferencing it now returns the machineinstr of the use. To get the operand, use I.getOperand(). Add a new MachineRegisterInfo::replaceRegWith, which is basically like Value::replaceAllUsesWith. llvm-svn: 45482 --- llvm/lib/CodeGen/MachineRegisterInfo.cpp | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'llvm/lib/CodeGen/MachineRegisterInfo.cpp') diff --git a/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/llvm/lib/CodeGen/MachineRegisterInfo.cpp index b41a1e748cc..dbb01c3e553 100644 --- a/llvm/lib/CodeGen/MachineRegisterInfo.cpp +++ b/llvm/lib/CodeGen/MachineRegisterInfo.cpp @@ -45,6 +45,20 @@ void MachineRegisterInfo::HandleVRegListReallocation() { } } +/// replaceRegWith - Replace all instances of FromReg with ToReg in the +/// machine function. This is like llvm-level X->replaceAllUsesWith(Y), +/// except that it also changes any definitions of the register as well. +void MachineRegisterInfo::replaceRegWith(unsigned FromReg, unsigned ToReg) { + assert(FromReg != ToReg && "Cannot replace a reg with itself"); + + // TODO: This could be more efficient by bulk changing the operands. + for (reg_iterator I = reg_begin(FromReg), E = reg_end(); I != E; ) { + MachineOperand &O = I.getOperand(); + ++I; + O.setReg(ToReg); + } +} + /// getVRegDef - Return the machine instr that defines the specified virtual /// register or null if none is found. This assumes that the code is in SSA @@ -54,8 +68,8 @@ MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const { "Invalid vreg!"); for (reg_iterator I = reg_begin(Reg), E = reg_end(); I != E; ++I) { // Since we are in SSA form, we can stop at the first definition. - if (I->isDef()) - return I->getParent(); + if (I.getOperand().isDef()) + return &*I; } return 0; } -- cgit v1.2.3