X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FWebAssembly%2FWebAssemblyRegStackify.cpp;h=d890310ac5013e5a10c09fce4bf21d84c3a9e8a8;hb=54fd4d436030f4fa15e8b9cd6643a9255890144c;hp=ac016a7b9b0aaa23fdf86b10195418a849076e3c;hpb=ca526959c1fc8d8172b780d916cdeb3f03a33836;p=oota-llvm.git

diff --git a/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp b/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
index ac016a7b9b0..d890310ac50 100644
--- a/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
+++ b/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
@@ -15,7 +15,7 @@
 /// are then marked as "stackified", meaning references to them are replaced by
 /// "push" and "pop" from the stack.
 ///
-/// This is primarily a code size optimiation, since temporary values on the
+/// This is primarily a code size optimization, since temporary values on the
 /// expression don't need to be named.
 ///
 //===----------------------------------------------------------------------===//
@@ -127,6 +127,8 @@ bool WebAssemblyRegStackify::runOnMachineFunction(MachineFunction &MF) {
   WebAssemblyFunctionInfo &MFI = *MF.getInfo<WebAssemblyFunctionInfo>();
   AliasAnalysis &AA = getAnalysis<AAResultsWrapperPass>().getAAResults();
 
+  assert(MRI.isSSA() && "RegStackify depends on SSA form");
+
   // Walk the instructions from the bottom up. Currently we don't look past
   // block boundaries, and the blocks aren't ordered so the block visitation
   // order isn't significant, but we may want to change this in the future.