X86: Fix frameescape when not using an FP

We can't use TargetFrameLowering::getFrameIndexOffset directly, because
Win64 really wants the offset from the stack pointer at the end of the
prologue. Instead, use X86FrameLowering::getFrameIndexOffsetFromSP(),
which is a pretty close approximiation of that. It fails to handle cases
with interestingly large stack alignments, which is pretty uncommon on
Win64 and is TODO.

llvm-svn: 233137

1 files changed, 0 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
index 9c90334..6ceace8 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -584,14 +584,6 @@ int MachineFrameInfo::CreateFixedSpillStackObject(uint64_t Size,
   return -++NumFixedObjects;
 }
 
-int MachineFrameInfo::CreateFrameAllocation(uint64_t Size) {
-  // Force the use of a frame pointer. The intention is that this intrinsic be
-  // used in conjunction with unwind mechanisms that leak the frame pointer.
-  setFrameAddressIsTaken(true);
-  Size = RoundUpToAlignment(Size, StackAlignment);
-  return CreateStackObject(Size, StackAlignment, false);
-}
-
 BitVector
 MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const {
   assert(MBB && "MBB must be valid");