[WebAssembly] Change comments on SP writing back (NFC)

Summary: We now write back not to memory but to __stack_pointer global.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D51074

llvm-svn: 340372

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
index 9e33ed7..8b156ec 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
@@ -99,8 +99,9 @@ bool WebAssemblyFrameLowering::needsSP(const MachineFunction &MF,
 }
 
 /// Returns true if the local user-space stack pointer needs to be written back
-/// to memory by this function (this is not meaningful if needsSP is false). If
-/// false, the stack red zone can be used and only a local SP is needed.
+/// to __stack_pointer global by this function (this is not meaningful if
+/// needsSP is false). If false, the stack red zone can be used and only a local
+/// SP is needed.
 bool WebAssemblyFrameLowering::needsSPWriteback(
     const MachineFunction &MF, const MachineFrameInfo &MFI) const {
   assert(needsSP(MF, MFI));