vendor/llvm/llvm-trunk-r375505vendor/llvm

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/CodeGen/LocalStackSlotAllocation.cpp b/lib/CodeGen/LocalStackSlotAllocation.cpp
index b14d76a585f7..2392d4d00b56 100644
--- a/lib/CodeGen/LocalStackSlotAllocation.cpp
+++ b/lib/CodeGen/LocalStackSlotAllocation.cpp
@@ -261,7 +261,7 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
 
   // Remember how big this blob of stack space is
   MFI.setLocalFrameSize(Offset);
-  MFI.setLocalFrameMaxAlign(MaxAlign);
+  MFI.setLocalFrameMaxAlign(assumeAligned(MaxAlign));
 }
 
 static inline bool
@@ -351,6 +351,14 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
     assert(MFI.isObjectPreAllocated(FrameIdx) &&
            "Only pre-allocated locals expected!");
 
+    // We need to keep the references to the stack protector slot through frame
+    // index operands so that it gets resolved by PEI rather than this pass.
+    // This avoids accesses to the stack protector though virtual base
+    // registers, and forces PEI to address it using fp/sp/bp.
+    if (MFI.hasStackProtectorIndex() &&
+        FrameIdx == MFI.getStackProtectorIndex())
+      continue;
+
     LLVM_DEBUG(dbgs() << "Considering: " << MI);
 
     unsigned idx = 0;