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PEI is now responsible for adding MaxCallFrameSize to frame size and align the stack. Each target can further adjust the frame size if necessary.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33460 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-01-23 09:38:11 +00:00
parent c970812283
commit 367372a30c
5 changed files with 16 additions and 50 deletions
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17
lib/CodeGen/PrologEpilogInserter.cpp
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@ -386,7 +386,22 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
}
}
// Set the final value of the stack pointer...
// Round up the size to a multiple of the alignment, but only if there are
// calls or alloca's in the function. This ensures that any calls to
// subroutines have their stack frames suitable aligned.
if (FFI->hasCalls() || FFI->hasVarSizedObjects()) {
// When we have no frame pointer, we reserve argument space for call sites
// in the function immediately on entry to the current function. This
// eliminates the need for add/sub sp brackets around call sites.
const MRegisterInfo *RegInfo = Fn.getTarget().getRegisterInfo();
if (!RegInfo->hasFP(Fn))
Offset += FFI->getMaxCallFrameSize();
unsigned AlignMask = TFI.getStackAlignment() - 1;
Offset = (Offset + AlignMask) & ~AlignMask;
}
// Update frame info to pretend that this is part of the stack...
FFI->setStackSize(Offset+TFI.getOffsetOfLocalArea());
// Remember the required stack alignment in case targets need it to perform