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Add the necessary support to the ISel to allow targets to codegen the new

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alignment information appropriately.  Includes code for PowerPC to support
fixed-size allocas with alignment larger than the stack.  Support for
arbitrarily aligned dynamic allocas coming soon.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24224 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2005-11-06 09:00:38 +00:00
parent ce5e04e710
commit ae232e7a10
4 changed files with 60 additions and 9 deletions
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14
lib/CodeGen/PrologEpilogInserter.cpp
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@ -258,6 +258,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
MachineFrameInfo *FFI = Fn.getFrameInfo();
unsigned StackAlignment = TFI.getStackAlignment();
unsigned MaxAlign = StackAlignment;
// Start at the beginning of the local area.
// The Offset is the distance from the stack top in the direction
@ -295,9 +296,11 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
Offset += FFI->getObjectSize(i);
unsigned Align = FFI->getObjectAlignment(i);
assert(Align <= StackAlignment && "Cannot align stack object to higher "
"alignment boundary than the stack itself!");
Offset = (Offset+Align-1)/Align*Align; // Adjust to Alignment boundary...
// If the alignment of this object is greater than that of the stack, then
// increase the stack alignment to match.
MaxAlign = std::max(MaxAlign, Align);
// Adjust to alignment boundary
Offset = (Offset+Align-1)/Align*Align;
if (StackGrowsDown) {
FFI->setObjectOffset(i, -Offset); // Set the computed offset
@ -315,6 +318,11 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// Set the final value of the stack pointer...
FFI->setStackSize(Offset+TFI.getOffsetOfLocalArea());
// If we have a new stack alignment, set the preferred stack alignment so that
// the targets can do the appropriate thing to properly align the stack above
// the default alignment.
if (MaxAlign > StackAlignment)
FFI->setMaxAlignment(MaxAlign);
}