f32 && f64 tests

spec/src/fixtures.rs

@@ -8,3 +8,5 @@ macro_rules! run_test {
 }
 
 run_test!("i32", wasm_i32);
+run_test!("f32", wasm_f32);
+run_test!("f64", wasm_f64);

spec/src/run.rs

@@ -10,6 +10,7 @@ use serde_json;
 use test;
 use parity_wasm;
 use parity_wasm::interpreter::{
+    RuntimeValue,
     ProgramInstance, ModuleInstance, ModuleInstanceInterface, 
     Error as InterpreterError,
 };
@@ -30,6 +31,18 @@ fn runtime_value(test_val: &test::RuntimeValue) -> parity_wasm::RuntimeValue {
             let unsigned: u32 = test_val.value.parse().expect("Literal parse error");
             parity_wasm::RuntimeValue::I32(unsigned as i32)
         },
+        "i64" => {
+            let unsigned: u64 = test_val.value.parse().expect("Literal parse error");
+            parity_wasm::RuntimeValue::I64(unsigned as i64)
+        },
+        "f32" => {
+            let unsigned: u32 = test_val.value.parse().expect("Literal parse error");
+            parity_wasm::RuntimeValue::decode_f32(unsigned)
+        },
+        "f64" => {
+            let unsigned: u64 = test_val.value.parse().expect("Literal parse error");
+            parity_wasm::RuntimeValue::decode_f64(unsigned)
+        },
         _ => panic!("Unknwon runtime value type"),
     }
 }
@@ -103,6 +116,24 @@ pub fn spec(name: &str) {
                     }
                 }
             },
+            &test::Command::AssertReturnCanonicalNan { line, ref action } | &test::Command::AssertReturnArithmeticNan { line, ref action } => {
+                let result = run_action(&*module, action);
+                match result {
+                    Ok(result) => {
+                        for actual_result in result.into_iter().collect::<Vec<parity_wasm::RuntimeValue>>() {
+                            match actual_result {
+                                RuntimeValue::F32(val) => if !val.is_nan() { panic!("Expected nan value, got {:?}", val) },
+                                RuntimeValue::F64(val) => if !val.is_nan() { panic!("Expected nan value, got {:?}", val) },
+                                val @ _ => panic!("Expected action to return float value, got {:?}", val),
+                            }
+                        }
+                        println!("assert_return_nan at line {} - success", line);
+                    },
+                    Err(e) => {
+                        panic!("Expected action to return value, got error: {:?}", e);
+                    }
+                }
+            },
             &test::Command::AssertTrap { line, ref action, .. } => {
                 let result = run_action(&*module, action);
                 match result {

spec/src/test.rs

@@ -25,6 +25,16 @@ pub enum Command {
         action: Action,
         expected: Vec<RuntimeValue>,
     },
+    #[serde(rename = "assert_return_canonical_nan")]
+    AssertReturnCanonicalNan {
+        line: u64,
+        action: Action,
+    },
+    #[serde(rename = "assert_return_arithmetic_nan")]
+    AssertReturnArithmeticNan {
+        line: u64,
+        action: Action,
+    },
     #[serde(rename = "assert_trap")]
     AssertTrap {
         line: u64,

src/interpreter/runner.rs

@@ -758,7 +758,7 @@ impl Interpreter {
 		context
 			.value_stack_mut()
 			.pop_as::<T>()
-			.map(|v| v.round())
+			.map(|v| v.nearest())
 			.map(|v| context.value_stack_mut().push(v.into()))
 			.map(|_| InstructionOutcome::RunNextInstruction)
 	}

src/interpreter/value.rs

@@ -99,6 +99,8 @@ pub trait Float<T>: ArithmeticOps<T> {
 	fn trunc(self) -> T;
 	/// Returns the nearest integer to a number. Round half-way cases away from 0.0.
 	fn round(self) -> T;
+	/// Returns the nearest integer to a number. Ties are round to even number.
+	fn nearest(self) -> T;
 	/// Takes the square root of a number.
 	fn sqrt(self) -> T;
 	/// Returns the minimum of the two numbers.
@@ -604,17 +606,40 @@ macro_rules! impl_float {
 			fn ceil(self) -> $type { self.ceil() }
 			fn trunc(self) -> $type { self.trunc() }
 			fn round(self) -> $type { self.round() }
+			fn nearest(self) -> $type {
+				let round = self.round();
+				if self.fract().abs() != 0.5 {
+					return round;
+				}
+
+				use std::ops::Rem;
+				if round.rem(2.0) == 1.0 {
+					self.floor()
+				} else if round.rem(2.0) == -1.0 {
+					self.ceil()
+				} else {
+					round
+				}
+			}
 			fn sqrt(self) -> $type { self.sqrt() }
-			// TODO
 			// This instruction corresponds to what is sometimes called "minNaN" in other languages.
-			// This differs from the IEEE 754-2008 minNum operation in that it returns a NaN if either operand is a NaN, and in that the behavior when the operands are zeros of differing signs is fully specified.
-			// This differs from the common x<y?x:y expansion in its handling of negative zero and NaN values.
-			fn min(self, other: $type) -> $type { self.min(other) }
-			// TODO
+			fn min(self, other: $type) -> $type {
+				if self.is_nan() || other.is_nan() {
+					use std::$type;
+					return $type::NAN;
+				}
+
+				self.min(other)
+			}
 			// This instruction corresponds to what is sometimes called "maxNaN" in other languages.
-			// This differs from the IEEE 754-2008 maxNum operation in that it returns a NaN if either operand is a NaN, and in that the behavior when the operands are zeros of differing signs is fully specified.
-			// This differs from the common x>y?x:y expansion in its handling of negative zero and NaN values.
-			fn max(self, other: $type) -> $type { self.max(other) }
+			fn max(self, other: $type) -> $type {
+				if self.is_nan() || other.is_nan() {
+					use std::$type;
+					return $type::NAN;
+				}
+
+				self.max(other)
+			}
 			fn copysign(self, other: $type) -> $type {
 				// TODO: this may be buggy for edge cases
 				if self.is_sign_positive() == other.is_sign_positive() {