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Disable shrink-wrap for Thumb1

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Summary: In ARMConstantIslandPass, which runs after Shrink Wrap pass, long jumps will be fixed up as BL (tBfar) which depends on spilling LR in epilogue.  However, shrink-wrap may remove the LR, which causes issues when the function returns.

Reviewers: qcolombet, rengolin

Subscribers: aemerson, rengolin

Differential Revision: http://reviews.llvm.org/D15984

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Weiming Zhao 2016-01-08 18:37:43 +00:00
parent da92e11909
commit ad748b70b5
1 changed files with 5 additions and 0 deletions
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5
lib/Target/ARM/Thumb1FrameLowering.h
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@ -53,6 +53,11 @@ public:
/// \p MBB will be correctly handled by the target.
bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
/// Disable shrink wrap as tBfar/BL will be used to adjust for long jumps.
bool enableShrinkWrapping(const MachineFunction &MF) const override {
return false;
}
private:
/// Check if the frame lowering of \p MF needs a special fixup
/// code sequence for the epilogue.