LocalCSE: Consider pass options, both size and cost (#1840)

With this we can optimize redundant global accesses fairly well (at least locally; licm also works), see #1831

2 files changed, 19 insertions, 0 deletions

diff --git a/test/example/cpp-unit.cpp b/test/example/cpp-unit.cpp
new file mode 100644
index 000000000..f51ca72b6
--- /dev/null
+++ b/test/example/cpp-unit.cpp
@@ -0,0 +1,18 @@
+// test multiple uses of the threadPool
+
+#include <assert.h>
+
+#include <wasm.h>
+#include <ir/cost.h>
+
+using namespace wasm;
+
+int main() 
+{
+  // Some optimizations assume that the cost of a get is zero, e.g. local-cse.
+  GetLocal get;
+  assert(CostAnalyzer(&get).cost == 0);
+
+  std::cout << "Success.\n";
+  return 0;
+}
diff --git a/test/example/cpp-unit.txt b/test/example/cpp-unit.txt
new file mode 100644
index 000000000..a9d787cc5
--- /dev/null
+++ b/test/example/cpp-unit.txt
@@ -0,0 +1 @@
+Success.