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Add a trivial but handy function to efficiently return the machine

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instruction that defines the specified vreg.  Crazy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45480 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-01 03:07:29 +00:00
parent 6c5757e4e8
commit a91a7d594f
2 changed files with 21 additions and 0 deletions
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6
include/llvm/CodeGen/MachineRegisterInfo.h
View File

@ -120,6 +120,12 @@ public:
return VRegInfo.size()+MRegisterInfo::FirstVirtualRegister-1;
}
/// 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
/// form, so there should only be one definition.
MachineInstr *getVRegDef(unsigned Reg) const;
//===--------------------------------------------------------------------===//
// Physical Register Use Info
//===--------------------------------------------------------------------===//

15
lib/CodeGen/MachineRegisterInfo.cpp
View File

@ -44,3 +44,18 @@ void MachineRegisterInfo::HandleVRegListReallocation() {
List->Contents.Reg.Prev = &VRegInfo[i].second;
}
}
/// 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
/// form, so there should only be one definition.
MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
assert(Reg-MRegisterInfo::FirstVirtualRegister < VRegInfo.size() &&
"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();
}
return 0;
}