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author | Chris Lattner <sabre@nondot.org> | 2008-01-01 20:36:19 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2008-01-01 20:36:19 +0000 |
commit | e138b3dd1ff02d826233482831318708a166ed93 (patch) | |
tree | 9a7f8e2fa9b65ad0426d782bb694626846a17f2d /lib/CodeGen/MachineRegisterInfo.cpp | |
parent | ab477ccde9382b58d3883eeb574ba09469d4cde8 (diff) | |
download | llvm-e138b3dd1ff02d826233482831318708a166ed93.tar.gz llvm-e138b3dd1ff02d826233482831318708a166ed93.tar.bz2 llvm-e138b3dd1ff02d826233482831318708a166ed93.tar.xz |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45482 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineRegisterInfo.cpp')
-rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index b41a1e748c..dbb01c3e55 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/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; } |