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| author | Hal Finkel <hfinkel@anl.gov> | 2013-03-22 23:32:27 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-03-22 23:32:27 +0000 |
| commit | dc3beb90178fc316f63790812b22201884eaa017 (patch) | |
| tree | d3574ac59a9d120549452dd0f94db575bb04096e /lib/CodeGen/PrologEpilogInserter.cpp | |
| parent | a2e3834d1644889484ef3a8a94189b7369e3eaf9 (diff) | |
| download | llvm-dc3beb90178fc316f63790812b22201884eaa017.tar.gz llvm-dc3beb90178fc316f63790812b22201884eaa017.tar.bz2 llvm-dc3beb90178fc316f63790812b22201884eaa017.tar.xz | |
Allow the register scavenger to spill multiple registers
This patch lets the register scavenger make use of multiple spill slots in
order to guarantee that it will be able to provide multiple registers
simultaneously.
To support this, the RS's API has changed slightly: setScavengingFrameIndex /
getScavengingFrameIndex have been replaced by addScavengingFrameIndex /
isScavengingFrameIndex / getScavengingFrameIndices.
In forthcoming commits, the PowerPC backend will use this capability in order
to implement the spilling of condition registers, and some special-purpose
registers, without relying on r0 being reserved. In some cases, spilling these
registers requires two GPRs: one for addressing and one to hold the value being
transferred.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177774 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/PrologEpilogInserter.cpp')
| -rw-r--r-- | lib/CodeGen/PrologEpilogInserter.cpp | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp index 855a8c5f92..413ce91ead 100644 --- a/lib/CodeGen/PrologEpilogInserter.cpp +++ b/lib/CodeGen/PrologEpilogInserter.cpp @@ -548,9 +548,11 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) { const TargetRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo(); if (RS && TFI.hasFP(Fn) && RegInfo->useFPForScavengingIndex(Fn) && !RegInfo->needsStackRealignment(Fn)) { - int SFI = RS->getScavengingFrameIndex(); - if (SFI >= 0) - AdjustStackOffset(MFI, SFI, StackGrowsDown, Offset, MaxAlign); + SmallVector<int, 2> SFIs; + RS->getScavengingFrameIndices(SFIs); + for (SmallVector<int, 2>::iterator I = SFIs.begin(), + IE = SFIs.end(); I != IE; ++I) + AdjustStackOffset(MFI, *I, StackGrowsDown, Offset, MaxAlign); } // FIXME: Once this is working, then enable flag will change to a target @@ -593,7 +595,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) { continue; if (i >= MinCSFrameIndex && i <= MaxCSFrameIndex) continue; - if (RS && (int)i == RS->getScavengingFrameIndex()) + if (RS && RS->isScavengingFrameIndex((int)i)) continue; if (MFI->isDeadObjectIndex(i)) continue; @@ -615,7 +617,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) { continue; if (i >= MinCSFrameIndex && i <= MaxCSFrameIndex) continue; - if (RS && (int)i == RS->getScavengingFrameIndex()) + if (RS && RS->isScavengingFrameIndex((int)i)) continue; if (MFI->isDeadObjectIndex(i)) continue; @@ -631,9 +633,11 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) { // stack pointer. if (RS && (!TFI.hasFP(Fn) || RegInfo->needsStackRealignment(Fn) || !RegInfo->useFPForScavengingIndex(Fn))) { - int SFI = RS->getScavengingFrameIndex(); - if (SFI >= 0) - AdjustStackOffset(MFI, SFI, StackGrowsDown, Offset, MaxAlign); + SmallVector<int, 2> SFIs; + RS->getScavengingFrameIndices(SFIs); + for (SmallVector<int, 2>::iterator I = SFIs.begin(), + IE = SFIs.end(); I != IE; ++I) + AdjustStackOffset(MFI, *I, StackGrowsDown, Offset, MaxAlign); } if (!TFI.targetHandlesStackFrameRounding()) { |