diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index b45f20857e1..335848f785e 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -688,6 +688,18 @@ BinaryenOp BinaryenExtendLowUVecI16x8ToVecI32x4(void) {
 BinaryenOp BinaryenExtendHighUVecI16x8ToVecI32x4(void) {
   return ExtendHighUVecI16x8ToVecI32x4;
 }
+BinaryenOp BinaryenExtendLowSVecI32x4ToVecI64x2(void) {
+  return ExtendLowSVecI32x4ToVecI64x2;
+}
+BinaryenOp BinaryenExtendHighSVecI32x4ToVecI64x2(void) {
+  return ExtendHighSVecI32x4ToVecI64x2;
+}
+BinaryenOp BinaryenExtendLowUVecI32x4ToVecI64x2(void) {
+  return ExtendLowUVecI32x4ToVecI64x2;
+}
+BinaryenOp BinaryenExtendHighUVecI32x4ToVecI64x2(void) {
+  return ExtendHighUVecI32x4ToVecI64x2;
+}
 BinaryenOp BinaryenSwizzleVec8x16(void) { return SwizzleVec8x16; }
 BinaryenOp BinaryenRefIsNull(void) { return RefIsNull; }
 BinaryenOp BinaryenRefIsFunc(void) { return RefIsFunc; }
diff --git a/src/binaryen-c.h b/src/binaryen-c.h
index 686fb5262a7..ebf82d2df5a 100644
--- a/src/binaryen-c.h
+++ b/src/binaryen-c.h
@@ -548,6 +548,10 @@ BINARYEN_API BinaryenOp BinaryenExtendLowSVecI16x8ToVecI32x4(void);
 BINARYEN_API BinaryenOp BinaryenExtendHighSVecI16x8ToVecI32x4(void);
 BINARYEN_API BinaryenOp BinaryenExtendLowUVecI16x8ToVecI32x4(void);
 BINARYEN_API BinaryenOp BinaryenExtendHighUVecI16x8ToVecI32x4(void);
+BINARYEN_API BinaryenOp BinaryenExtendLowSVecI32x4ToVecI64x2(void);
+BINARYEN_API BinaryenOp BinaryenExtendHighSVecI32x4ToVecI64x2(void);
+BINARYEN_API BinaryenOp BinaryenExtendLowUVecI32x4ToVecI64x2(void);
+BINARYEN_API BinaryenOp BinaryenExtendHighUVecI32x4ToVecI64x2(void);
 BINARYEN_API BinaryenOp BinaryenSwizzleVec8x16(void);
 BINARYEN_API BinaryenOp BinaryenRefIsNull(void);
 BINARYEN_API BinaryenOp BinaryenRefIsFunc(void);
diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index 4c8a8c91ed4..e0d10fe66c4 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -475,6 +475,10 @@ function initializeConstants() {
     'ExtendHighSVecI16x8ToVecI32x4',
     'ExtendLowUVecI16x8ToVecI32x4',
     'ExtendHighUVecI16x8ToVecI32x4',
+    'ExtendLowSVecI32x4ToVecI64x2',
+    'ExtendHighSVecI32x4ToVecI64x2',
+    'ExtendLowUVecI32x4ToVecI64x2',
+    'ExtendHighUVecI32x4ToVecI64x2',
     'SwizzleVec8x16',
     'RefIsNull',
     'RefIsFunc',
@@ -1856,6 +1860,18 @@ function wrapModule(module, self = {}) {
     'mul'(left, right) {
       return Module['_BinaryenBinary'](module, Module['MulVecI64x2'], left, right);
     },
+    'extend_low_i32x4_s'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtendLowSVecI32x4ToVecI64x2'], value);
+    },
+    'extend_high_i32x4_s'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtendHighSVecI32x4ToVecI64x2'], value);
+    },
+    'extend_low_i32x4_u'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtendLowUVecI32x4ToVecI64x2'], value);
+    },
+    'extend_high_i32x4_u'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtendHighUVecI32x4ToVecI64x2'], value);
+    },
   };
 
   self['f32x4'] = {
diff --git a/test/binaryen.js/kitchen-sink.js b/test/binaryen.js/kitchen-sink.js
index cb2cd32ffb5..ce07ee7bfe8 100644
--- a/test/binaryen.js/kitchen-sink.js
+++ b/test/binaryen.js/kitchen-sink.js
@@ -297,6 +297,10 @@ function test_core() {
     module.i32x4.extend_high_i16x8_s(module.v128.const(v128_bytes)),
     module.i32x4.extend_low_i16x8_u(module.v128.const(v128_bytes)),
     module.i32x4.extend_high_i16x8_u(module.v128.const(v128_bytes)),
+    module.i64x2.extend_low_i32x4_s(module.v128.const(v128_bytes)),
+    module.i64x2.extend_high_i32x4_s(module.v128.const(v128_bytes)),
+    module.i64x2.extend_low_i32x4_u(module.v128.const(v128_bytes)),
+    module.i64x2.extend_high_i32x4_u(module.v128.const(v128_bytes)),
     // Binary
     module.i32.add(module.i32.const(-10), module.i32.const(-11)),
     module.f64.sub(module.f64.const(-9005.841), module.f64.const(-9007.333)),
diff --git a/test/binaryen.js/kitchen-sink.js.txt b/test/binaryen.js/kitchen-sink.js.txt
index 9d97b652331..9d4133fa9b1 100644
--- a/test/binaryen.js/kitchen-sink.js.txt
+++ b/test/binaryen.js/kitchen-sink.js.txt
@@ -561,6 +561,26 @@ getExpressionInfo(tuple[3])={"id":14,"type":5,"value":3.7}
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i64x2.extend_low_i32x4_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_high_i32x4_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_low_i32x4_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_high_i32x4_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i32.add
         (i32.const -10)
@@ -2359,6 +2379,26 @@ getExpressionInfo(tuple[3])={"id":14,"type":5,"value":3.7}
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i64x2.extend_low_i32x4_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_high_i32x4_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_low_i32x4_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_high_i32x4_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i32.add
         (i32.const -10)
diff --git a/test/example/c-api-kitchen-sink.c b/test/example/c-api-kitchen-sink.c
index e4e8c37b05b..2c4ed912298 100644
--- a/test/example/c-api-kitchen-sink.c
+++ b/test/example/c-api-kitchen-sink.c
@@ -435,6 +435,10 @@ void test_core() {
     makeUnary(module, BinaryenExtendHighSVecI16x8ToVecI32x4(), v128),
     makeUnary(module, BinaryenExtendLowUVecI16x8ToVecI32x4(), v128),
     makeUnary(module, BinaryenExtendHighUVecI16x8ToVecI32x4(), v128),
+    makeUnary(module, BinaryenExtendLowSVecI32x4ToVecI64x2(), v128),
+    makeUnary(module, BinaryenExtendHighSVecI32x4ToVecI64x2(), v128),
+    makeUnary(module, BinaryenExtendLowUVecI32x4ToVecI64x2(), v128),
+    makeUnary(module, BinaryenExtendHighUVecI32x4ToVecI64x2(), v128),
     // Binary
     makeBinary(module, BinaryenAddInt32(), i32),
     makeBinary(module, BinaryenSubFloat64(), f64),
diff --git a/test/example/c-api-kitchen-sink.txt b/test/example/c-api-kitchen-sink.txt
index e6785037608..3b95fd1b507 100644
--- a/test/example/c-api-kitchen-sink.txt
+++ b/test/example/c-api-kitchen-sink.txt
@@ -471,6 +471,26 @@ BinaryenFeatureAll: 8191
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i64x2.extend_low_i32x4_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_high_i32x4_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_low_i32x4_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i64x2.extend_high_i32x4_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i32.add
         (i32.const -10)