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Fixes the last x86-64 test failure in compat.exp:

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<16 x float> is 64-byte aligned (for some reason),
which gets us into the stack realignment code.  The
computation changing FP-relative offsets to SP-relative
was broken, assiging a spill temp to a location
also used for parameter passing.  This
fixes it by rounding up the stack frame to a multiple
of the largest alignment (I concluded it wasn't fixable
without doing this, but I'm not very sure.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52750 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2008-06-26 01:51:13 +00:00
parent 872a738775
commit b5dae00325
4 changed files with 18 additions and 7 deletions
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8
lib/CodeGen/PrologEpilogInserter.cpp
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@ -459,15 +459,19 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// 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.
// Also do this if we need runtime alignment of the stack. In this case
// offsets will be relative to SP not FP; round up the stack size so this
// works.
if (!RegInfo->targetHandlesStackFrameRounding() &&
(FFI->hasCalls() || FFI->hasVarSizedObjects())) {
(FFI->hasCalls() || FFI->hasVarSizedObjects() ||
RegInfo->needsStackRealignment(Fn))) {
// If we have reserved argument space for call sites in the function
// immediately on entry to the current function, count it as part of the
// overall stack size.
if (RegInfo->hasReservedCallFrame(Fn))
Offset += FFI->getMaxCallFrameSize();
unsigned AlignMask = TFI.getStackAlignment() - 1;
unsigned AlignMask = std::max(TFI.getStackAlignment(),MaxAlign) - 1;
Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
}