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Update local stack block allocation to let PEI do the allocs if no additional

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base registers were required. This will allow for slightly better packing
of the locals when alignment padding is necessary after callee saved registers.

llvm-svn: 111508
This commit is contained in:
Jim Grosbach 2010-08-19 02:47:08 +00:00
parent bb27588b3f
commit d6e0ffd95b
3 changed files with 28 additions and 3 deletions
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16
include/llvm/CodeGen/MachineFrameInfo.h
View File

@ -216,6 +216,11 @@ class MachineFrameInfo {
/// alignment of any object in it.
unsigned LocalFrameMaxAlign;
/// Whether the local object blob needs to be allocated together. If not,
/// PEI should ignore the isPreAllocated flags on the stack objects and
/// just allocate them normally.
bool UseLocalStackAllocationBlock;
public:
explicit MachineFrameInfo(const TargetFrameInfo &tfi) : TFI(tfi) {
StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
@ -315,6 +320,17 @@ public:
/// object blob.
unsigned getLocalFrameMaxAlign() { return LocalFrameMaxAlign; }
/// getUseLocalStackAllocationBlock - Get whether the local allocation blob
/// should be allocated together or let PEI allocate the locals in it
/// directly.
bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;}
/// setUseLocalStackAllocationBlock - Set whether the local allocation blob
/// should be allocated together or let PEI allocate the locals in it
/// directly.
void setUseLocalStackAllocationBlock(bool v) {
UseLocalStackAllocationBlock = v;
}
/// isObjectPreAllocated - Return true if the object was pre-allocated into
/// the local block.

7
lib/CodeGen/LocalStackSlotAllocation.cpp
View File

@ -89,6 +89,13 @@ bool LocalStackSlotPass::runOnMachineFunction(MachineFunction &MF) {
// Insert virtual base registers to resolve frame index references.
insertFrameReferenceRegisters(MF);
// Tell MFI whether any base registers were allocated. PEI will only
// want to use the local block allocations from this pass if there were any.
// Otherwise, PEI can do a bit better job of getting the alignment right
// without a hole at the start since it knows the alignment of the stack
// at the start of local allocation, and this pass doesn't.
MFI->setUseLocalStackAllocationBlock(NumBaseRegisters > 0);
return true;
}

8
lib/CodeGen/PrologEpilogInserter.cpp
View File

@ -560,7 +560,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// check for whether the frame is large enough to want to use virtual
// frame index registers. Functions which don't want/need this optimization
// will continue to use the existing code path.
if (EnableLocalStackAlloc && MFI->getLocalFrameSize()) {
if (EnableLocalStackAlloc && MFI->getUseLocalStackAllocationBlock()) {
unsigned Align = MFI->getLocalFrameMaxAlign();
// Adjust to alignment boundary.
@ -593,7 +593,8 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// Assign large stack objects first.
for (unsigned i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) {
if (MFI->isObjectPreAllocated(i))
if (MFI->isObjectPreAllocated(i) &&
MFI->getUseLocalStackAllocationBlock())
continue;
if (i >= MinCSFrameIndex && i <= MaxCSFrameIndex)
continue;
@ -614,7 +615,8 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// Then assign frame offsets to stack objects that are not used to spill
// callee saved registers.
for (unsigned i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) {
if (MFI->isObjectPreAllocated(i))
if (MFI->isObjectPreAllocated(i) &&
MFI->getUseLocalStackAllocationBlock())
continue;
if (i >= MinCSFrameIndex && i <= MaxCSFrameIndex)
continue;