diff --git a/src/test/codegen/wasm_casts_nontrapping.rs b/src/test/codegen/wasm_casts_nontrapping.rs
new file mode 100644
index 0000000000000000000000000000000000000000..bd6073d8c204a7eb0b099a8ae792f5478f0eb746
--- /dev/null
+++ b/src/test/codegen/wasm_casts_nontrapping.rs
@@ -0,0 +1,162 @@
+// only-wasm32
+// compile-flags: -C target-feature=+nontrapping-fptoint
+#![crate_type = "lib"]
+
+// CHECK-LABEL: @cast_f64_i64
+#[no_mangle]
+pub fn cast_f64_i64(a: f64) -> i64 {
+    // CHECK: tail call i64 @llvm.wasm.trunc.saturate.signed.i64.f64(double {{.*}})
+    // CHECK-NEXT: ret i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f64_i32
+#[no_mangle]
+pub fn cast_f64_i32(a: f64) -> i32 {
+    // CHECK: tail call i32 @llvm.wasm.trunc.saturate.signed.i32.f64(double {{.*}})
+    // CHECK-NEXT: ret i32 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_i64
+#[no_mangle]
+pub fn cast_f32_i64(a: f32) -> i64 {
+    // CHECK: tail call i64 @llvm.wasm.trunc.saturate.signed.i64.f32(float {{.*}})
+    // CHECK-NEXT: ret i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_i32
+#[no_mangle]
+pub fn cast_f32_i32(a: f32) -> i32 {
+    // CHECK: tail call i32 @llvm.wasm.trunc.saturate.signed.i32.f32(float {{.*}})
+    // CHECK-NEXT: ret i32 {{.*}}
+    a as _
+}
+
+
+// CHECK-LABEL: @cast_f64_u64
+#[no_mangle]
+pub fn cast_f64_u64(a: f64) -> u64 {
+    // CHECK: tail call i64 @llvm.wasm.trunc.saturate.unsigned.i64.f64(double {{.*}})
+    // CHECK-NEXT: ret i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f64_u32
+#[no_mangle]
+pub fn cast_f64_u32(a: f64) -> u32 {
+    // CHECK: tail call i32 @llvm.wasm.trunc.saturate.unsigned.i32.f64(double {{.*}})
+    // CHECK-NEXT: ret i32 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_u64
+#[no_mangle]
+pub fn cast_f32_u64(a: f32) -> u64 {
+    // CHECK: tail call i64 @llvm.wasm.trunc.saturate.unsigned.i64.f32(float {{.*}})
+    // CHECK-NEXT: ret i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_u32
+#[no_mangle]
+pub fn cast_f32_u32(a: f32) -> u32 {
+    // CHECK: tail call i32 @llvm.wasm.trunc.saturate.unsigned.i32.f32(float {{.*}})
+    // CHECK-NEXT: ret i32 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_u8
+#[no_mangle]
+pub fn cast_f32_u8(a: f32) -> u8 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i8
+    // CHECK-NEXT: select i1 {{.*}}, i8 {{.*}}, i8 {{.*}}
+    // CHECK-NEXT: ret i8 {{.*}}
+    a as _
+}
+
+
+
+// CHECK-LABEL: @cast_unchecked_f64_i64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_i64(a: f64) -> i64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi double {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f64_i32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_i32(a: f64) -> i32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi double {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_i64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_i64(a: f32) -> i64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi float {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_i32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_i32(a: f32) -> i32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi float {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+
+// CHECK-LABEL: @cast_unchecked_f64_u64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_u64(a: f64) -> u64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui double {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f64_u32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_u32(a: f64) -> u32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui double {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_u64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_u64(a: f32) -> u64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_u32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_u32(a: f32) -> u32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_u8
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_u8(a: f32) -> u8 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i8
+    // CHECK-NEXT: ret i8 {{.*}}
+    a.to_int_unchecked()
+}
diff --git a/src/test/codegen/wasm_casts_trapping.rs b/src/test/codegen/wasm_casts_trapping.rs
new file mode 100644
index 0000000000000000000000000000000000000000..45b905190493a12151704411e8b8955842f16d1b
--- /dev/null
+++ b/src/test/codegen/wasm_casts_trapping.rs
@@ -0,0 +1,169 @@
+// only-wasm32
+// compile-flags: -C target-feature=-nontrapping-fptoint
+#![crate_type = "lib"]
+
+// CHECK-LABEL: @cast_f64_i64
+#[no_mangle]
+pub fn cast_f64_i64(a: f64) -> i64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi double {{.*}} to i64
+    // CHECK-NEXT: select i1 {{.*}}, i64 {{.*}}, i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f64_i32
+#[no_mangle]
+pub fn cast_f64_i32(a: f64) -> i32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi double {{.*}} to i32
+    // CHECK-NEXT: select i1 {{.*}}, i32 {{.*}}, i32 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_i64
+#[no_mangle]
+pub fn cast_f32_i64(a: f32) -> i64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi float {{.*}} to i64
+    // CHECK-NEXT: select i1 {{.*}}, i64 {{.*}}, i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_i32
+#[no_mangle]
+pub fn cast_f32_i32(a: f32) -> i32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi float {{.*}} to i32
+    // CHECK-NEXT: select i1 {{.*}}, i32 {{.*}}, i32 {{.*}}
+    a as _
+}
+
+
+// CHECK-LABEL: @cast_f64_u64
+#[no_mangle]
+pub fn cast_f64_u64(a: f64) -> u64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui double {{.*}} to i64
+    // CHECK-NEXT: select i1 {{.*}}, i64 {{.*}}, i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f64_u32
+#[no_mangle]
+pub fn cast_f64_u32(a: f64) -> u32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui double {{.*}} to i32
+    // CHECK-NEXT: select i1 {{.*}}, i32 {{.*}}, i32 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_u64
+#[no_mangle]
+pub fn cast_f32_u64(a: f32) -> u64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i64
+    // CHECK-NEXT: select i1 {{.*}}, i64 {{.*}}, i64 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_u32
+#[no_mangle]
+pub fn cast_f32_u32(a: f32) -> u32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i32
+    // CHECK-NEXT: select i1 {{.*}}, i32 {{.*}}, i32 {{.*}}
+    a as _
+}
+
+// CHECK-LABEL: @cast_f32_u8
+#[no_mangle]
+pub fn cast_f32_u8(a: f32) -> u8 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i8
+    // CHECK-NEXT: select i1 {{.*}}, i8 {{.*}}, i8 {{.*}}
+    a as _
+}
+
+
+
+// CHECK-LABEL: @cast_unchecked_f64_i64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_i64(a: f64) -> i64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi double {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f64_i32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_i32(a: f64) -> i32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi double {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_i64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_i64(a: f32) -> i64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi float {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_i32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_i32(a: f32) -> i32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptosi float {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+
+// CHECK-LABEL: @cast_unchecked_f64_u64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_u64(a: f64) -> u64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui double {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f64_u32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f64_u32(a: f64) -> u32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui double {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_u64
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_u64(a: f32) -> u64 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i64
+    // CHECK-NEXT: ret i64 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_u32
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_u32(a: f32) -> u32 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i32
+    // CHECK-NEXT: ret i32 {{.*}}
+    a.to_int_unchecked()
+}
+
+// CHECK-LABEL: @cast_unchecked_f32_u8
+#[no_mangle]
+pub unsafe fn cast_unchecked_f32_u8(a: f32) -> u8 {
+    // CHECK-NOT: {{.*}} call {{.*}} @llvm.wasm.trunc.{{.*}}
+    // CHECK: fptoui float {{.*}} to i8
+    // CHECK-NEXT: ret i8 {{.*}}
+    a.to_int_unchecked()
+}