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-rw-r--r--llvm/lib/Target/WebAssembly/README.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/WebAssembly/README.txt b/llvm/lib/Target/WebAssembly/README.txt
index f4417e930c8..68f902ee59f 100644
--- a/llvm/lib/Target/WebAssembly/README.txt
+++ b/llvm/lib/Target/WebAssembly/README.txt
@@ -95,3 +95,8 @@ It could be done with a smaller encoding like this:
copy_local $3=, $pop6
//===---------------------------------------------------------------------===//
+
+WebAssembly registers are implicitly initialized to zero. Explicit zeroing is
+therefore often redundant and could be optimized away.
+
+//===---------------------------------------------------------------------===//
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