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-rw-r--r--llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
index ac016a7..9fbde70 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
@@ -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.