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LiveInterval: Add support to track liveness of subregisters.

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This code adds the required data structures. Algorithms to compute it follow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223877 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2014-12-10 01:12:10 +00:00
parent 5874714ac3
commit 01ddf04b63
6 changed files with 246 additions and 32 deletions
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29
lib/CodeGen/LiveInterval.cpp
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@ -26,6 +26,7 @@
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include <algorithm>
@ -641,6 +642,11 @@ void LiveRange::print(raw_ostream &OS) const {
void LiveInterval::print(raw_ostream &OS) const {
OS << PrintReg(reg) << ' ';
super::print(OS);
// Print subranges
for (const_subrange_iterator I = subrange_begin(), E = subrange_end();
I != E; ++I) {
OS << format(" L%04X ", I->LaneMask) << *I;
}
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
@ -669,6 +675,27 @@ void LiveRange::verify() const {
}
}
}
void LiveInterval::verify(const MachineRegisterInfo *MRI) const {
super::verify();
// Make sure SubRanges are fine and LaneMasks are disjunct.
unsigned Mask = 0;
unsigned MaxMask = MRI != nullptr ? MRI->getMaxLaneMaskForVReg(reg) : ~0u;
for (const_subrange_iterator I = subrange_begin(), E = subrange_end(); I != E;
++I) {
// Subrange lanemask should be disjunct to any previous subrange masks.
assert((Mask & I->LaneMask) == 0);
Mask |= I->LaneMask;
// subrange mask should not contained in maximum lane mask for the vreg.
assert((Mask & ~MaxMask) == 0);
I->verify();
// Main liverange should cover subrange.
assert(covers(*I));
}
}
#endif
@ -959,6 +986,8 @@ void ConnectedVNInfoEqClasses::Distribute(LiveInterval *LIV[],
} else
*J++ = *I;
}
// TODO: do not cheat anymore by simply cleaning all subranges
LI.clearSubRanges();
LI.segments.erase(J, E);
// Transfer VNInfos to their new owners and renumber them.