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LivePhysRegs: Add support to add pristine registers when populating with live-in/live-out registers.

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Differential Revision: http://reviews.llvm.org/D10139

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241172 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-07-01 17:17:17 +00:00
parent 1804878f0c
commit 08f65f9d69
2 changed files with 49 additions and 12 deletions
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41
lib/CodeGen/LivePhysRegs.cpp
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@ -14,6 +14,8 @@
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
@ -123,3 +125,42 @@ void LivePhysRegs::dump() const {
dbgs() << " " << *this;
#endif
}
/// Add live-in registers of basic block \p MBB to \p LiveRegs.
static void addLiveIns(LivePhysRegs &LiveRegs, const MachineBasicBlock &MBB) {
for (unsigned Reg : make_range(MBB.livein_begin(), MBB.livein_end()))
LiveRegs.addReg(Reg);
}
/// Add pristine registers to the given \p LiveRegs. This function removes
/// actually saved callee save registers when \p InPrologueEpilogue is false.
static void addPristines(LivePhysRegs &LiveRegs, const MachineFunction &MF,
const TargetRegisterInfo &TRI) {
const MachineFrameInfo &MFI = *MF.getFrameInfo();
if (!MFI.isCalleeSavedInfoValid())
return;
for (const MCPhysReg *CSR = TRI.getCalleeSavedRegs(&MF); CSR && *CSR; ++CSR)
LiveRegs.addReg(*CSR);
for (const CalleeSavedInfo &Info : MFI.getCalleeSavedInfo())
LiveRegs.removeReg(Info.getReg());
}
void LivePhysRegs::addLiveOuts(const MachineBasicBlock *MBB,
bool AddPristines) {
if (AddPristines) {
const MachineFunction &MF = *MBB->getParent();
addPristines(*this, MF, *TRI);
}
for (const MachineBasicBlock *Succ : MBB->successors())
::addLiveIns(*this, *Succ);
}
void LivePhysRegs::addLiveIns(const MachineBasicBlock *MBB,
bool AddPristines) {
if (AddPristines) {
const MachineFunction &MF = *MBB->getParent();
addPristines(*this, MF, *TRI);
}
::addLiveIns(*this, *MBB);
}