Add conversion

Author: dontru

README.md

@@ -239,3 +239,74 @@ for (int i = 0; i < 10; i++) {
     (get_local $a)
     (get_local $b)))
 ```
+
+### Conversion
+
+```WebAssembly
+(func $i64_to_i32 (param i64) (result i32)
+  (i32.wrap/i64
+    (get_local 0)))
+
+(func $f32_to_i32 (param f32) (result i32)
+  (i32.trunc_s/f32
+    (get_local 0)))
+
+(func $f64_to_i32 (param f64) (result i32)
+  (i32.trunc_s/f64
+    (get_local 0)))
+
+(func $i32_to_i64 (param i32) (result i64)
+  (i64.extend_s/i32
+    (get_local 0)))
+
+(func $f32_to_i64 (param f32) (result i64)
+  (i64.trunc_s/f32
+    (get_local 0)))
+
+(func $f64_to_i64 (param f64) (result i64)
+  (i64.trunc_s/f64
+    (get_local 0)))
+
+(func $i32_to_f32 (param i32) (result f32)
+  (f32.convert_s/i32
+    (get_local 0)))
+
+(func $i64_to_f32 (param i64) (result f32)
+  (f32.convert_s/i64
+    (get_local 0)))
+
+(func $f64_to_f32 (param f64) (result f32)
+  (f32.demote/f64
+    (get_local 0)))
+
+(func $i32_to_f64 (param i32) (result f64)
+  (f64.convert_s/i32
+    (get_local 0)))
+
+(func $i64_to_f64 (param i64) (result f64)
+  (f64.convert_s/i64
+    (get_local 0)))
+
+(func $f32_to_f64 (param f32) (result f64)
+  (f64.promote/f32
+    (get_local 0)))
+
+(func $i32_to_bool (param i32) (result i32)
+  (i32.ne
+    (get_local 0)
+    (i32.const 0)))
+
+(func $i32_to_i8 (param i32) (result i32)
+  (i32.shr_s
+    (i32.shl
+      (get_local 0)
+      (i32.const 24))
+    (i32.const 24)))
+
+(func $i32_to_i16 (param i32) (result i32)
+  (i32.shr_s
+    (i32.shl
+      (get_local 0)
+      (i32.const 16))
+    (i32.const 16)))
+```