fix i64 conversion

Author: MikeInnes

common/integer.rv

@@ -117,6 +117,11 @@ fn Float64(Int(x)) {
   wasm f64.convert_i64_s(x: i64): f64
 }
 
+fn oftype(to: Int, x: Float64) {
+  # TODO catch out of range
+  oftype(to, wasm i64.trunc_f64_s(x): i64)
+}
+
 fn (a: Int) / (b: Int) { Float64(a) / Float64(b) }
 
 fn js(x: Int) { js(Float64(x)) }

common/wasm/js.rv

@@ -117,14 +117,8 @@ fn Float64(obj: JSObject) {
   return x
 }
 
-@extend
-fn Int32(obj: JSObject) {
-  x = wasm call(support.identity, jsref(obj)): i32
-  return Int32(x)
-}
-
 fn oftype(to: Int, from: JSObject) {
-  oftype(to, Int32(from))
+  oftype(to, Float64(from))
 }
 
 fn oftype(to: UInt, from: JSObject) {

test/language.ts

@@ -927,6 +927,13 @@ test('allocs', async () => {
   `)
 })
 
+test('js int conversion', async () => {
+  await rv(`
+    test Int64(js(2828255673)) == 2828255673
+    test Int32(js(2828255673)) == -1466711623
+  `)
+})
+
 test('wasi', async () => {
   await compile(path.join(__dirname, 'language', 'wasi.rv'),
     { options: { memcheck: false } })