Better handling of local offsets for downwards growing stacks. This corrects

relative offsets when there are offsets encoded in the instructions and
simplifies final allocation in PEI. rdar://8277890

llvm-svn: 111836

1 files changed, 8 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
index 4b8a4b5562f..b600790d851 100644
--- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
@@ -572,16 +572,18 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
 
     DEBUG(dbgs() << "Local frame base offset: " << Offset << "\n");
 
-    // Allocate the local block
-    Offset += MFI->getLocalFrameSize();
-
     // Resolve offsets for objects in the local block.
     for (unsigned i = 0, e = MFI->getLocalFrameObjectCount(); i != e; ++i) {
       std::pair<int, int64_t> Entry = MFI->getLocalFrameObjectMap(i);
-      int64_t FIOffset = MFI->getLocalFrameBaseOffset() + Entry.second;
-
-      AdjustStackOffset(MFI, Entry.first, StackGrowsDown, FIOffset, MaxAlign);
+      int64_t FIOffset = (StackGrowsDown ? -Offset : Offset) + Entry.second;
+      DEBUG(dbgs() << "alloc FI(" << Entry.first << ") at SP[" <<
+            FIOffset << "]\n");
+      MFI->setObjectOffset(Entry.first, FIOffset);
     }
+    // Allocate the local block
+    Offset += MFI->getLocalFrameSize();
+
+    MaxAlign = std::max(Align, MaxAlign);
   }
 
   // Make sure that the stack protector comes before the local variables on the