diff --git a/package.json b/package.json
index 51fa40cd..500528c6 100644
--- a/package.json
+++ b/package.json
@@ -44,8 +44,7 @@
     "build": "webpack",
     "clean": "node scripts/clean",
     "lint": "tslint --project src",
-    "test:config": "npm run test:config:assembly --scripts-prepend-node-path && npm run test:config:portable --scripts-prepend-node-path && npm run test:config:src --scripts-prepend-node-path",
-    "test:config:assembly": "tsc --noEmit -p std/assembly --diagnostics --listFiles",
+    "test:config": "npm run test:config:portable --scripts-prepend-node-path && npm run test:config:src --scripts-prepend-node-path",
     "test:config:portable": "tsc --noEmit -p std/portable --diagnostics --listFiles",
     "test:config:src": "tsc --noEmit -p src --diagnostics --listFiles",
     "test:parser": "node tests/parser",
diff --git a/std/assembly.d.ts b/std/assembly.d.ts
index 7946d2f6..63900de6 100644
--- a/std/assembly.d.ts
+++ b/std/assembly.d.ts
@@ -193,6 +193,8 @@ declare function isFinite<T = f32 | f64>(value: T): bool;
 declare function assert<T>(isTrueish: T, message?: string): T & object; // any better way to model `: T != null`?
 /** Parses an integer string to a 64-bit float. */
 declare function parseInt(str: string, radix?: i32): f64;
+/** Parses an integer string to a 32-bit integer. */
+declare function parseI32(str: string, radix?: i32): i32;
 /** Parses an integer string to a 64-bit integer. */
 declare function parseI64(str: string, radix?: i32): i64;
 /** Parses a string to a 64-bit float. */
diff --git a/std/assembly/string.ts b/std/assembly/string.ts
index 861dd182..dfd8befa 100644
--- a/std/assembly/string.ts
+++ b/std/assembly/string.ts
@@ -351,45 +351,34 @@ const enum CharCode {
 }
 
 export function parseInt(str: String, radix: i32 = 0): f64 {
-  var len: i32 = str.length;
-  if (!len)
-    return NaN;
-  var ptr = changetype<usize>(str) /* + HEAD -> offset */;
-  var code = <i32>load<u16>(ptr, HEAD);
+  return parse<f64>(str, radix);
+}
 
-  // pre-check sign
-  if (code == CharCode.MINUS) {
-    if (!--len)
-      return NaN;
-  } else if (code == CharCode.PLUS) {
-    if (!--len)
-      return NaN;
-  }
-
-  // pre-check radix
-  if (radix && (radix < 2 || radix > 36))
-    return NaN;
-
-  return <f64>parseI64(str, radix);
+export function parseI32(str: String, radix: i32 = 0): i32 {
+  return parse<i32>(str, radix);
 }
 
 export function parseI64(str: String, radix: i32 = 0): i64 {
+  return parse<i64>(str, radix);
+}
+
+function parse<T>(str: String, radix: i32 = 0): T {
   var len: i32 = str.length;
   if (!len)
-    return 0; // (NaN)
+    return <T>NaN;
   var ptr = changetype<usize>(str) /* + HEAD -> offset */;
   var code = <i32>load<u16>(ptr, HEAD);
 
   // determine sign
-  var sign: i64;
+  var sign: T;
   if (code == CharCode.MINUS) {
     if (!--len)
-      return 0; // (NaN)
+      return <T>NaN;
     code = <i32>load<u16>(ptr += 2, HEAD);
     sign = -1;
   } else if (code == CharCode.PLUS) {
     if (!--len)
-      return 0; // (NaN)
+      return <T>NaN;
     code = <i32>load<u16>(ptr += 2, HEAD);
     sign = 1;
   } else
@@ -423,10 +412,10 @@ export function parseI64(str: String, radix: i32 = 0): i64 {
       }
     } else radix = 10;
   } else if (radix < 2 || radix > 36)
-    return 0; // (NaN)
+    return <T>NaN;
 
   // calculate value
-  var num: i64 = 0;
+  var num: T = 0;
   while (len--) {
     code = <i32>load<u16>(ptr, HEAD);
     if (code >= CharCode._0 && code <= CharCode._9)
diff --git a/std/portable.d.ts b/std/portable.d.ts
index 1f4a5ae3..3fe2a859 100644
--- a/std/portable.d.ts
+++ b/std/portable.d.ts
@@ -135,6 +135,8 @@ declare function changetype<T>(value: any): T;
 declare function assert<T>(isTrueish: T, message?: string): T & object; // any better way to model `: T != null`?
 /** Parses an integer string to a 64-bit float. */
 declare function parseInt(str: string, radix?: i32): f64;
+/** Parses an integer string to a 32-bit integer. */
+declare function parseI32(str: string, radix?: i32): i32;
 /** Parses a floating point string to a 64-bit float. */
 declare function parseFloat(str: string): f64;
 
diff --git a/std/portable.js b/std/portable.js
index cda83fe6..f575c91c 100644
--- a/std/portable.js
+++ b/std/portable.js
@@ -98,3 +98,7 @@ globalScope["changetype"] = function changetype(value) { return value; }
 
 String["fromCharCodes"] = function fromCharCodes(arr) { return String.fromCharCode.apply(String, arr); }
 String["fromCodePoints"] = function fromCodePoints(arr) { return String.fromCodePoint.apply(String, arr); }
+
+globalScope["parseI32"] = function parseI32(str, radix) {
+  return parseInt(str) | 0;
+};
diff --git a/tests/compiler/std/array.wast b/tests/compiler/std/array.wast
index 3e0db620..87798d17 100644
--- a/tests/compiler/std/array.wast
+++ b/tests/compiler/std/array.wast
@@ -4077,8 +4077,11 @@
   ENUM: std:string/CharCode
   FUNCTION_PROTOTYPE: std:string/parseInt
   FUNCTION_PROTOTYPE: parseInt
+  FUNCTION_PROTOTYPE: std:string/parseI32
+  FUNCTION_PROTOTYPE: parseI32
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseI64
+  FUNCTION_PROTOTYPE: std:string/parse
   FUNCTION_PROTOTYPE: std:string/parseFloat
   FUNCTION_PROTOTYPE: parseFloat
   GLOBAL: std/array/arr
@@ -4118,6 +4121,8 @@
   CLASS_PROTOTYPE: String
   FUNCTION_PROTOTYPE: parseInt
   FUNCTION_PROTOTYPE: std:string/parseInt
+  FUNCTION_PROTOTYPE: parseI32
+  FUNCTION_PROTOTYPE: std:string/parseI32
   FUNCTION_PROTOTYPE: parseI64
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseFloat
diff --git a/tests/compiler/std/carray.wast b/tests/compiler/std/carray.wast
index ef42ffdf..969796e6 100644
--- a/tests/compiler/std/carray.wast
+++ b/tests/compiler/std/carray.wast
@@ -284,8 +284,11 @@
   ENUM: std:string/CharCode
   FUNCTION_PROTOTYPE: std:string/parseInt
   FUNCTION_PROTOTYPE: parseInt
+  FUNCTION_PROTOTYPE: std:string/parseI32
+  FUNCTION_PROTOTYPE: parseI32
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseI64
+  FUNCTION_PROTOTYPE: std:string/parse
   FUNCTION_PROTOTYPE: std:string/parseFloat
   FUNCTION_PROTOTYPE: parseFloat
   GLOBAL: std/carray/arr
@@ -314,6 +317,8 @@
   CLASS_PROTOTYPE: String
   FUNCTION_PROTOTYPE: parseInt
   FUNCTION_PROTOTYPE: std:string/parseInt
+  FUNCTION_PROTOTYPE: parseI32
+  FUNCTION_PROTOTYPE: std:string/parseI32
   FUNCTION_PROTOTYPE: parseI64
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseFloat
diff --git a/tests/compiler/std/heap.wast b/tests/compiler/std/heap.wast
index 6e6a99fb..b7d92c06 100644
--- a/tests/compiler/std/heap.wast
+++ b/tests/compiler/std/heap.wast
@@ -2893,8 +2893,11 @@
   ENUM: std:string/CharCode
   FUNCTION_PROTOTYPE: std:string/parseInt
   FUNCTION_PROTOTYPE: parseInt
+  FUNCTION_PROTOTYPE: std:string/parseI32
+  FUNCTION_PROTOTYPE: parseI32
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseI64
+  FUNCTION_PROTOTYPE: std:string/parse
   FUNCTION_PROTOTYPE: std:string/parseFloat
   FUNCTION_PROTOTYPE: parseFloat
   GLOBAL: std/heap/size
@@ -2936,6 +2939,8 @@
   CLASS_PROTOTYPE: String
   FUNCTION_PROTOTYPE: parseInt
   FUNCTION_PROTOTYPE: std:string/parseInt
+  FUNCTION_PROTOTYPE: parseI32
+  FUNCTION_PROTOTYPE: std:string/parseI32
   FUNCTION_PROTOTYPE: parseI64
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseFloat
diff --git a/tests/compiler/std/new.wast b/tests/compiler/std/new.wast
index d5213004..51dc0f6f 100644
--- a/tests/compiler/std/new.wast
+++ b/tests/compiler/std/new.wast
@@ -234,8 +234,11 @@
   ENUM: std:string/CharCode
   FUNCTION_PROTOTYPE: std:string/parseInt
   FUNCTION_PROTOTYPE: parseInt
+  FUNCTION_PROTOTYPE: std:string/parseI32
+  FUNCTION_PROTOTYPE: parseI32
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseI64
+  FUNCTION_PROTOTYPE: std:string/parse
   FUNCTION_PROTOTYPE: std:string/parseFloat
   FUNCTION_PROTOTYPE: parseFloat
   CLASS_PROTOTYPE: std/new/AClass
@@ -276,6 +279,8 @@
   CLASS_PROTOTYPE: String
   FUNCTION_PROTOTYPE: parseInt
   FUNCTION_PROTOTYPE: std:string/parseInt
+  FUNCTION_PROTOTYPE: parseI32
+  FUNCTION_PROTOTYPE: std:string/parseI32
   FUNCTION_PROTOTYPE: parseI64
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseFloat
diff --git a/tests/compiler/std/set.wast b/tests/compiler/std/set.wast
index bbaf156f..566aab41 100644
--- a/tests/compiler/std/set.wast
+++ b/tests/compiler/std/set.wast
@@ -2802,8 +2802,11 @@
   ENUM: std:string/CharCode
   FUNCTION_PROTOTYPE: std:string/parseInt
   FUNCTION_PROTOTYPE: parseInt
+  FUNCTION_PROTOTYPE: std:string/parseI32
+  FUNCTION_PROTOTYPE: parseI32
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseI64
+  FUNCTION_PROTOTYPE: std:string/parse
   FUNCTION_PROTOTYPE: std:string/parseFloat
   FUNCTION_PROTOTYPE: parseFloat
   GLOBAL: std/set/set
@@ -2842,6 +2845,8 @@
   CLASS_PROTOTYPE: String
   FUNCTION_PROTOTYPE: parseInt
   FUNCTION_PROTOTYPE: std:string/parseInt
+  FUNCTION_PROTOTYPE: parseI32
+  FUNCTION_PROTOTYPE: std:string/parseI32
   FUNCTION_PROTOTYPE: parseI64
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseFloat
diff --git a/tests/compiler/std/string.optimized.wast b/tests/compiler/std/string.optimized.wast
index 4424003a..a8777bc2 100644
--- a/tests/compiler/std/string.optimized.wast
+++ b/tests/compiler/std/string.optimized.wast
@@ -2,7 +2,6 @@
  (type $i (func (result i32)))
  (type $iii (func (param i32 i32) (result i32)))
  (type $iiii (func (param i32 i32 i32) (result i32)))
- (type $iiI (func (param i32 i32) (result i64)))
  (type $iiF (func (param i32 i32) (result f64)))
  (type $iF (func (param i32) (result f64)))
  (type $v (func))
@@ -375,11 +374,11 @@
  (func $std/string/getString (; 5 ;) (type $i) (result i32)
   (get_global $std/string/str)
  )
- (func $std:string/parseI64 (; 6 ;) (type $iiI) (param $0 i32) (param $1 i32) (result i64)
+ (func $std:string/parse<f64> (; 6 ;) (type $iiF) (param $0 i32) (param $1 i32) (result f64)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i64)
-  (local $5 i64)
+  (local $4 f64)
+  (local $5 f64)
   (if
    (i32.eqz
     (tee_local $3
@@ -389,11 +388,11 @@
     )
    )
    (return
-    (i64.const 0)
+    (f64.const nan:0x8000000000000)
    )
   )
   (set_local $5
-   (if (result i64)
+   (if (result f64)
     (i32.eq
      (tee_local $2
       (i32.load16_u offset=4
@@ -402,7 +401,7 @@
      )
      (i32.const 45)
     )
-    (block (result i64)
+    (block (result f64)
      (if
       (i32.eqz
        (tee_local $3
@@ -413,7 +412,7 @@
        )
       )
       (return
-       (i64.const 0)
+       (f64.const nan:0x8000000000000)
       )
      )
      (set_local $2
@@ -426,14 +425,14 @@
        )
       )
      )
-     (i64.const -1)
+     (f64.const -1)
     )
-    (if (result i64)
+    (if (result f64)
      (i32.eq
       (get_local $2)
       (i32.const 43)
      )
-     (block (result i64)
+     (block (result f64)
       (if
        (i32.eqz
         (tee_local $3
@@ -444,7 +443,7 @@
         )
        )
        (return
-        (i64.const 0)
+        (f64.const nan:0x8000000000000)
        )
       )
       (set_local $2
@@ -457,9 +456,9 @@
         )
        )
       )
-      (i64.const 1)
+      (f64.const 1)
      )
-     (i64.const 1)
+     (f64.const 1)
     )
    )
   )
@@ -484,7 +483,7 @@
      (i32.const 1)
     )
     (return
-     (i64.const 0)
+     (f64.const nan:0x8000000000000)
     )
    )
    (set_local $1
@@ -714,14 +713,14 @@
        )
       )
       (set_local $4
-       (i64.add
-        (i64.mul
+       (f64.add
+        (f64.mul
          (get_local $4)
-         (i64.extend_s/i32
+         (f64.convert_s/i32
           (get_local $1)
          )
         )
-        (i64.extend_s/i32
+        (f64.convert_s/i32
          (get_local $2)
         )
        )
@@ -737,95 +736,15 @@
     )
    )
   )
-  (i64.mul
+  (f64.mul
    (get_local $5)
    (get_local $4)
   )
  )
  (func $std:string/parseInt (; 7 ;) (type $iiF) (param $0 i32) (param $1 i32) (result f64)
-  (local $2 i32)
-  (local $3 i32)
-  (if
-   (i32.eqz
-    (tee_local $2
-     (i32.load
-      (get_local $0)
-     )
-    )
-   )
-   (return
-    (f64.const nan:0x8000000000000)
-   )
-  )
-  (if
-   (i32.eq
-    (tee_local $3
-     (i32.load16_u offset=4
-      (get_local $0)
-     )
-    )
-    (i32.const 45)
-   )
-   (if
-    (i32.eqz
-     (i32.sub
-      (get_local $2)
-      (i32.const 1)
-     )
-    )
-    (return
-     (f64.const nan:0x8000000000000)
-    )
-   )
-   (if
-    (i32.eq
-     (get_local $3)
-     (i32.const 43)
-    )
-    (if
-     (i32.eqz
-      (i32.sub
-       (get_local $2)
-       (i32.const 1)
-      )
-     )
-     (return
-      (f64.const nan:0x8000000000000)
-     )
-    )
-   )
-  )
-  (if
-   (select
-    (i32.and
-     (select
-      (i32.lt_s
-       (get_local $1)
-       (i32.const 2)
-      )
-      (i32.gt_s
-       (get_local $1)
-       (i32.const 36)
-      )
-      (i32.lt_s
-       (get_local $1)
-       (i32.const 2)
-      )
-     )
-     (i32.const 1)
-    )
-    (get_local $1)
-    (get_local $1)
-   )
-   (return
-    (f64.const nan:0x8000000000000)
-   )
-  )
-  (f64.convert_s/i64
-   (call $std:string/parseI64
-    (get_local $0)
-    (get_local $1)
-   )
+  (call $std:string/parse<f64>
+   (get_local $0)
+   (get_local $1)
   )
  )
  (func $std:string/parseFloat (; 8 ;) (type $iF) (param $0 i32) (result f64)
diff --git a/tests/compiler/std/string.wast b/tests/compiler/std/string.wast
index 9a02085b..e8754d40 100644
--- a/tests/compiler/std/string.wast
+++ b/tests/compiler/std/string.wast
@@ -2,7 +2,6 @@
  (type $i (func (result i32)))
  (type $iii (func (param i32 i32) (result i32)))
  (type $iiii (func (param i32 i32 i32) (result i32)))
- (type $iiI (func (param i32 i32) (result i64)))
  (type $iiF (func (param i32 i32) (result f64)))
  (type $iF (func (param i32) (result f64)))
  (type $v (func))
@@ -500,13 +499,13 @@
    (get_global $std/string/str)
   )
  )
- (func $std:string/parseI64 (; 7 ;) (type $iiI) (param $0 i32) (param $1 i32) (result i64)
+ (func $std:string/parse<f64> (; 7 ;) (type $iiF) (param $0 i32) (param $1 i32) (result f64)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
-  (local $5 i64)
+  (local $5 f64)
   (local $6 i32)
-  (local $7 i64)
+  (local $7 f64)
   (set_local $2
    (i32.load
     (get_local $0)
@@ -517,7 +516,7 @@
     (get_local $2)
    )
    (return
-    (i64.const 0)
+    (f64.const nan:0x8000000000000)
    )
   )
   (set_local $3
@@ -545,7 +544,7 @@
       )
      )
      (return
-      (i64.const 0)
+      (f64.const nan:0x8000000000000)
      )
     )
     (set_local $4
@@ -559,9 +558,8 @@
      )
     )
     (set_local $5
-     (i64.sub
-      (i64.const 0)
-      (i64.const 1)
+     (f64.neg
+      (f64.const 1)
      )
     )
    )
@@ -581,7 +579,7 @@
        )
       )
       (return
-       (i64.const 0)
+       (f64.const nan:0x8000000000000)
       )
      )
      (set_local $4
@@ -595,11 +593,11 @@
       )
      )
      (set_local $5
-      (i64.const 1)
+      (f64.const 1)
      )
     )
     (set_local $5
-     (i64.const 1)
+     (f64.const 1)
     )
    )
   )
@@ -766,12 +764,12 @@
      (i32.const 1)
     )
     (return
-     (i64.const 0)
+     (f64.const nan:0x8000000000000)
     )
    )
   )
   (set_local $7
-   (i64.const 0)
+   (f64.const 0)
   )
   (block $break|1
    (loop $continue|1
@@ -894,14 +892,14 @@
         (br $break|1)
        )
        (set_local $7
-        (i64.add
-         (i64.mul
+        (f64.add
+         (f64.mul
           (get_local $7)
-          (i64.extend_s/i32
+          (f64.convert_s/i32
            (get_local $1)
           )
          )
-         (i64.extend_s/i32
+         (f64.convert_s/i32
           (get_local $4)
          )
         )
@@ -919,113 +917,17 @@
    )
   )
   (return
-   (i64.mul
+   (f64.mul
     (get_local $5)
     (get_local $7)
    )
   )
  )
  (func $std:string/parseInt (; 8 ;) (type $iiF) (param $0 i32) (param $1 i32) (result f64)
-  (local $2 i32)
-  (local $3 i32)
-  (local $4 i32)
-  (set_local $2
-   (i32.load
-    (get_local $0)
-   )
-  )
-  (if
-   (i32.eqz
-    (get_local $2)
-   )
-   (return
-    (f64.const nan:0x8000000000000)
-   )
-  )
-  (set_local $3
-   (get_local $0)
-  )
-  (set_local $4
-   (i32.load16_u offset=4
-    (get_local $3)
-   )
-  )
-  (if
-   (i32.eq
-    (get_local $4)
-    (i32.const 45)
-   )
-   (if
-    (i32.eqz
-     (tee_local $2
-      (i32.sub
-       (get_local $2)
-       (i32.const 1)
-      )
-     )
-    )
-    (return
-     (f64.const nan:0x8000000000000)
-    )
-   )
-   (if
-    (i32.eq
-     (get_local $4)
-     (i32.const 43)
-    )
-    (if
-     (i32.eqz
-      (tee_local $2
-       (i32.sub
-        (get_local $2)
-        (i32.const 1)
-       )
-      )
-     )
-     (return
-      (f64.const nan:0x8000000000000)
-     )
-    )
-   )
-  )
-  (if
-   (if (result i32)
-    (i32.ne
-     (get_local $1)
-     (i32.const 0)
-    )
-    (i32.and
-     (if (result i32)
-      (i32.ne
-       (i32.lt_s
-        (get_local $1)
-        (i32.const 2)
-       )
-       (i32.const 0)
-      )
-      (i32.lt_s
-       (get_local $1)
-       (i32.const 2)
-      )
-      (i32.gt_s
-       (get_local $1)
-       (i32.const 36)
-      )
-     )
-     (i32.const 1)
-    )
-    (get_local $1)
-   )
-   (return
-    (f64.const nan:0x8000000000000)
-   )
-  )
   (return
-   (f64.convert_s/i64
-    (call $std:string/parseI64
-     (get_local $0)
-     (get_local $1)
-    )
+   (call $std:string/parse<f64>
+    (get_local $0)
+    (get_local $1)
    )
   )
  )
@@ -1634,8 +1536,11 @@
   ENUM: std:string/CharCode
   FUNCTION_PROTOTYPE: std:string/parseInt
   FUNCTION_PROTOTYPE: parseInt
+  FUNCTION_PROTOTYPE: std:string/parseI32
+  FUNCTION_PROTOTYPE: parseI32
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseI64
+  FUNCTION_PROTOTYPE: std:string/parse
   FUNCTION_PROTOTYPE: std:string/parseFloat
   FUNCTION_PROTOTYPE: parseFloat
   GLOBAL: std/string/str
@@ -1665,6 +1570,8 @@
   CLASS_PROTOTYPE: String
   FUNCTION_PROTOTYPE: parseInt
   FUNCTION_PROTOTYPE: std:string/parseInt
+  FUNCTION_PROTOTYPE: parseI32
+  FUNCTION_PROTOTYPE: std:string/parseI32
   FUNCTION_PROTOTYPE: parseI64
   FUNCTION_PROTOTYPE: std:string/parseI64
   FUNCTION_PROTOTYPE: parseFloat