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Compile time improvements to VirtRegRewriter.

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This change to VirtRegRewriter::addMBBLiveIns adds live-in registers for each
MachineBasicBlock's LiveIns set without isLiveIn checks as they are being added
because doing so is expensive. After all live-in registers are added, the LiveIn
vectors are sorted and uniqued.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Puyan Lotfi
2015-05-22 08:11:26 +00:00
parent b6b98c12d5
commit d9a08b08ac
2 changed files with 19 additions and 7 deletions
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15
include/llvm/CodeGen/MachineBasicBlock.h
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@ -315,9 +315,18 @@ public:
// LiveIn management methods.
/// addLiveIn - Add the specified register as a live in. Note that it
/// is an error to add the same register to the same set more than once.
void addLiveIn(unsigned Reg) { LiveIns.push_back(Reg); }
/// Adds the specified register as a live in. Note that it is an error to add
/// the same register to the same set more than once unless the intention is
/// to call sortUniqueLiveIns after all registers are added.
void addLiveIn(unsigned Reg) { LiveIns.push_back(Reg); }
/// Sorts and uniques the LiveIns vector. It can be significantly faster to do
/// this than repeatedly calling isLiveIn before calling addLiveIn for every
/// LiveIn insertion.
void sortUniqueLiveIns() {
std::sort(LiveIns.begin(), LiveIns.end());
LiveIns.erase(std::unique(LiveIns.begin(), LiveIns.end()), LiveIns.end());
}
/// Add PhysReg as live in to this block, and ensure that there is a copy of
/// PhysReg to a virtual register of class RC. Return the virtual register