From: Dan Gohman <dan433584@gmail.com>
Date: Wed, 25 Nov 2015 21:32:06 +0000 (+0000)
Subject: [WebAssembly] Add some comments. NFC.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=c2d7234c34efc8409b6e282c850d6f9a79011ea9;ds=sidebyside

[WebAssembly] Add some comments. NFC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254096 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp b/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
index 29332940b76..c98bea9c214 100644
--- a/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
+++ b/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
@@ -187,7 +187,12 @@ void WebAssemblyPassConfig::addPostRegAlloc() {
 void WebAssemblyPassConfig::addPreSched2() {}
 
 void WebAssemblyPassConfig::addPreEmitPass() {
+  // Put the CFG in structured form; insert BLOCK and LOOP markers.
   addPass(createWebAssemblyCFGStackify());
+
+  // Create a mapping from LLVM CodeGen virtual registers to wasm registers.
   addPass(createWebAssemblyRegNumbering());
+
+  // Perform the very last peephole optimizations on the code.
   addPass(createWebAssemblyPeephole());
 }