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Force fixed-size but large alloca objects to the dynamically allocated

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area to avoid using up precious stack space within the 4095 offset limit
from %fp.  Such objects that would themselves live at a large offset
were being put there already so this is a simple change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7066 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2003-07-02 06:59:22 +00:00
parent 44cfdf9b9a
commit ea28dd3392
1 changed files with 14 additions and 8 deletions
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22
lib/Target/SparcV9/SparcV9InstrSelection.cpp
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@ -1109,15 +1109,21 @@ CreateCodeForFixedSizeAlloca(const TargetMachine& target,
Function *F = result->getParent()->getParent();
MachineFunction &mcInfo = MachineFunction::get(F);
// Check if the offset would small enough to use as an immediate in
// load/stores (check LDX because all load/stores have the same-size immediate
// field). If not, put the variable in the dynamically sized area of the
// frame.
unsigned paddedSizeIgnored;
// Put the variable in the dynamically sized area of the frame if either:
// (a) The offset is too large to use as an immediate in load/stores
// (check LDX because all load/stores have the same-size immed. field).
// (b) The object is "large", so it could cause many other locals,
// spills, and temporaries to have large offsets.
// NOTE: We use LARGE = 8 * argSlotSize = 64 bytes.
// You've gotta love having only 13 bits for constant offset values :-|.
//
unsigned paddedSize;
int offsetFromFP = mcInfo.getInfo()->computeOffsetforLocalVar(result,
paddedSizeIgnored,
tsize * numElements);
if (! target.getInstrInfo().constantFitsInImmedField(V9::LDXi,offsetFromFP)) {
paddedSize,
tsize * numElements);
if (((int)paddedSize) > 8 * target.getFrameInfo().getSizeOfEachArgOnStack() ||
! target.getInstrInfo().constantFitsInImmedField(V9::LDXi,offsetFromFP)) {
CreateCodeForVariableSizeAlloca(target, result, tsize,
ConstantSInt::get(Type::IntTy,numElements),
getMvec);