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Stack Alignment: when creating stack objects in MachineFrameInfo, make sure

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the alignment is clamped to TargetFrameLowering.getStackAlignment if the target
does not support stack realignment or the option "realign-stack" is off.

This will cause miscompile if the address is treated as aligned and add is
replaced with or in DAGCombine.

Added a bool StackRealignable to TargetFrameLowering to check whether stack
realignment is implemented for the target. Also added a bool RealignOption
to MachineFrameInfo to check whether the option "realign-stack" is on.

rdar://12713765


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169197 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2012-12-04 00:52:33 +00:00
parent 46608c0f64
commit 69261a6442
4 changed files with 85 additions and 4 deletions
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5
include/llvm/CodeGen/MachineFrameInfo.h
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@@ -221,8 +221,11 @@ class MachineFrameInfo {
/// just allocate them normally.
bool UseLocalStackAllocationBlock;
/// Whether the "realign-stack" option is on.
bool RealignOption;
public:
explicit MachineFrameInfo(const TargetFrameLowering &tfi) : TFI(tfi) {
explicit MachineFrameInfo(const TargetFrameLowering &tfi, bool RealignOpt)
: TFI(tfi), RealignOption(RealignOpt) {
StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
HasVarSizedObjects = false;
FrameAddressTaken = false;