diff --git a/core/src/main/java/org/teavm/backend/wasm/render/WasmCRenderingVisitor.java b/core/src/main/java/org/teavm/backend/wasm/render/WasmCRenderingVisitor.java
index 219e51db1..9259a9da7 100644
--- a/core/src/main/java/org/teavm/backend/wasm/render/WasmCRenderingVisitor.java
+++ b/core/src/main/java/org/teavm/backend/wasm/render/WasmCRenderingVisitor.java
@@ -642,21 +642,27 @@ class WasmCRenderingVisitor implements WasmExpressionVisitor {
         if (type != null && expression.getSourceType() != expression.getTargetType()) {
             switch (expression.getTargetType()) {
                 case INT32:
-                    if (expression.isSigned()) {
+                    if (expression.getSourceType() == WasmType.FLOAT32 && expression.isReinterpret()) {
+                        result.setText("reinterpret_float32(" + operand.getText() + ")");
+                    } else if (expression.isSigned()) {
                         result.setText("(int32_t) " + operand.getText());
                     } else {
                         result.setText("(uint32_t) " + operand.getText());
                     }
                     break;
                 case INT64:
-                    if (expression.isSigned()) {
+                    if (expression.getSourceType() == WasmType.FLOAT64 && expression.isReinterpret()) {
+                        result.setText("reinterpret_float64(" + operand.getText() + ")");
+                    } else if (expression.isSigned()) {
                         result.setText("(int64_t) " + operand.getText());
                     } else {
                         result.setText("(uint64_t) " + operand.getText());
                     }
                     break;
                 case FLOAT32:
-                    if (expression.getSourceType() == WasmType.FLOAT64) {
+                    if (expression.getSourceType() == WasmType.INT32 && expression.isReinterpret()) {
+                        result.setText("reinterpret_int32(" + operand.getText() + ")");
+                    } else if (expression.getSourceType() == WasmType.FLOAT64) {
                         result.setText("(float) " + operand.getText());
                     } else if (expression.isSigned()) {
                         result.setText("(float) (int64_t) " + operand.getText());
@@ -665,7 +671,9 @@ class WasmCRenderingVisitor implements WasmExpressionVisitor {
                     }
                     break;
                 case FLOAT64:
-                    if (expression.getSourceType() == WasmType.FLOAT32) {
+                    if (expression.getSourceType() == WasmType.INT64 && expression.isReinterpret()) {
+                        result.setText("reinterpret_int64(" + operand.getText() + ")");
+                    } else if (expression.getSourceType() == WasmType.FLOAT32) {
                         result.setText("(double) " + operand.getText());
                     } else if (expression.isSigned()) {
                         result.setText("(double) (int64_t) " + operand.getText());
diff --git a/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.c b/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.c
index 76dd1737a..87b3f2d26 100644
--- a/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.c
+++ b/core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.c
@@ -17,4 +17,27 @@ static int64_t currentTimeMillis() {
     clock_gettime(CLOCK_REALTIME, &time);
 
     return time.tv_sec * 1000 + (int64_t) round(time.tv_nsec / 1000000);
+}
+
+static union { float f; int32_t i; } reinterpret_union_32;
+static union { double f; int64_t i; } reinterpret_union_64;
+
+inline static int64_t reinterpret_float64(double v) {
+    reinterpret_union_64.f = v;
+    return reinterpret_union_64.i;
+}
+
+inline static double reinterpret_int64(int64_t v) {
+    reinterpret_union_64.i = v;
+    return reinterpret_union_64.f;
+}
+
+inline static int32_t reinterpret_float32(double v) {
+    reinterpret_union_32.f = v;
+    return reinterpret_union_32.i;
+}
+
+inline static float reinterpret_int32(int32_t v) {
+    reinterpret_union_32.i = v;
+    return reinterpret_union_32.f;
 }
\ No newline at end of file