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| author | Quentin Colombet <qcolombet@apple.com> | 2015-12-09 23:08:18 +0000 |
|---|---|---|
| committer | Quentin Colombet <qcolombet@apple.com> | 2015-12-09 23:08:18 +0000 |
| commit | 5d2f7cfd44db983c5c21d36356c3319d792a90bc (patch) | |
| tree | 516d6364e8b823dcfa6d9c7915a950cae0c2f0cf /llvm/lib/Target/X86/X86FrameLowering.cpp | |
| parent | 429183e7c8b93e8fcbad7741f87fc25d1cb94d51 (diff) | |
| download | bcm5719-llvm-5d2f7cfd44db983c5c21d36356c3319d792a90bc.tar.gz bcm5719-llvm-5d2f7cfd44db983c5c21d36356c3319d792a90bc.zip | |
[X86] Enable shrink-wrapping by default, but keep it disabled for stack frames
without a frame pointer when unwind may happen.
This is a workaround for a bug in the way we emit the CFI directives for
frameless unwind information. See PR25614.
llvm-svn: 255175
Diffstat (limited to 'llvm/lib/Target/X86/X86FrameLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86FrameLowering.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp index 2e7ed58e340..8695a0e2967 100644 --- a/llvm/lib/Target/X86/X86FrameLowering.cpp +++ b/llvm/lib/Target/X86/X86FrameLowering.cpp @@ -2595,6 +2595,12 @@ bool X86FrameLowering::canUseAsEpilogue(const MachineBasicBlock &MBB) const { return !flagsNeedToBePreservedBeforeTheTerminators(MBB); } +bool X86FrameLowering::enableShrinkWrapping(const MachineFunction &MF) const { + // If we may need to emit frameless compact unwind information, give + // up as this is currently broken: PR25614. + return MF.getFunction()->hasFnAttribute(Attribute::NoUnwind) || hasFP(MF); +} + MachineBasicBlock::iterator X86FrameLowering::restoreWin32EHStackPointers( MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, DebugLoc DL, bool RestoreSP) const { |
