Refactor getMaxBits() out of OptimizeInstructions and add beginnings of unit testing for it (#3019)

getMaxBits just moves around, no logic is changed.

Aside from adding getMaxBits, the change in bits.h is 99% whitespace.

helps #2879

1 files changed, 29 insertions, 5 deletions

diff --git a/test/example/cpp-unit.cpp b/test/example/cpp-unit.cpp
index e6189d9d1..2ba4388d1 100644
--- a/test/example/cpp-unit.cpp
+++ b/test/example/cpp-unit.cpp
@@ -1,17 +1,41 @@
 // test multiple uses of the threadPool
 
-#include <assert.h>
+#include <iostream>
 
-#include <wasm.h>
+#include <ir/bits.h>
 #include <ir/cost.h>
+#include <wasm.h>
 
 using namespace wasm;
 
-int main() 
-{
+void compare(size_t x, size_t y) {
+  if (x != y) {
+    std::cout << "comparison error!\n" << x << '\n' << y << '\n';
+    abort();
+  }
+}
+
+void test_bits() {
+  Const c;
+  c.type = Type::i32;
+  c.value = Literal(int32_t(1));
+  compare(Bits::getMaxBits(&c), 1);
+  c.value = Literal(int32_t(2));
+  compare(Bits::getMaxBits(&c), 2);
+  c.value = Literal(int32_t(3));
+  compare(Bits::getMaxBits(&c), 2);
+}
+
+void test_cost() {
   // Some optimizations assume that the cost of a get is zero, e.g. local-cse.
   LocalGet get;
-  assert(CostAnalyzer(&get).cost == 0);
+  compare(CostAnalyzer(&get).cost, 0);
+}
+
+int main() {
+  test_bits();
+
+  test_cost();
 
   std::cout << "Success.\n";
   return 0;