Fixes FP rounding issue and adds tests

Justfile

@@ -101,7 +101,8 @@ examples-ci target=default-target features="": (build-rust-wasm-examples target)
     cargo run {{ if features =="" {"--no-default-features --features kvm,mshv3"} else {"--no-default-features -F function_call_metrics," + features } }} --profile={{ if target == "debug" {"dev"} else { target } }} --example metrics 
 
 examples-components target=default-target features="": (build-rust-component-examples target) 
-    {{ wit-world }} cargo run {{ if features =="" {''} else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" {"dev"} else { target } }} --example component_example
+    {{ wit-world }} cargo run {{ if features =="" {''} else {"--no-default-features -F kvm -F " + features } }} --profile={{ if target == "debug" {"dev"} else { target } }} --example component_example
+    {{ wit-world-c }} cargo run {{ if features =="" {''} else {"--no-default-features -F kvm -F " + features } }} --profile={{ if target == "debug" {"dev"} else { target } }} --example c-component
 
 # warning, compares to and then OVERWRITES the given baseline
 bench-ci baseline target="release" features="":

src/hyperlight_wasm/examples/c-component/main.rs

@@ -0,0 +1,68 @@
+use examples_common::get_wasm_module_path;
+use hyperlight_wasm::SandboxBuilder;
+
+use crate::bindings::example::runcomponent::Guest;
+
+extern crate alloc;
+mod bindings {
+    hyperlight_component_macro::host_bindgen!(
+        "../../src/wasmsamples/components/runcomponent-world.wasm"
+    );
+}
+
+pub struct State {}
+impl State {
+    pub fn new() -> Self {
+        State {}
+    }
+}
+
+impl Default for State {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl bindings::example::runcomponent::Host for State {
+    fn r#get_time_since_boot_microsecond(&mut self) -> i64 {
+        let res = std::time::SystemTime::now()
+            .duration_since(std::time::SystemTime::UNIX_EPOCH)
+            .unwrap()
+            .as_micros();
+        i64::try_from(res).unwrap()
+    }
+}
+
+impl bindings::example::runcomponent::RuncomponentImports for State {
+    type Host = State;
+
+    fn r#host(&mut self) -> impl ::core::borrow::BorrowMut<Self::Host> {
+        self
+    }
+}
+
+fn main() {
+    let state = State::new();
+    let mut sandbox = SandboxBuilder::new()
+        .with_guest_input_buffer_size(70000000)
+        .with_guest_heap_size(200000000)
+        .with_guest_stack_size(100000000)
+        //.with_debugging_enabled(8080)
+        .build()
+        .unwrap();
+    let rt = bindings::register_host_functions(&mut sandbox, state);
+
+    let sb = sandbox.load_runtime().unwrap();
+
+    let mod_path = get_wasm_module_path("runcomponent.aot").unwrap();
+    let sb = sb.load_module(mod_path).unwrap();
+
+    let mut wrapped = bindings::RuncomponentSandbox { sb, rt };
+    let instance = bindings::example::runcomponent::RuncomponentExports::guest(&mut wrapped);
+    let echo = instance.echo("Hello World!".to_string());
+    println!("{}", echo);
+
+    let result = instance.round_to_nearest_int(1.331, 24.0);
+    println!("rounded result {}", result);
+    assert_eq!(result, 32);
+}

src/hyperlight_wasm/examples/helloworld/main.rs

@@ -83,5 +83,37 @@ fn main() -> Result<()> {
             );
         }
     }
+
+    let tests = [
+        (1.331, 24.0, 32),
+        (std::f32::consts::PI, std::f32::consts::E, 9),
+        (-5.7, 10.3, -59),
+        (0.0, 0.0, 0),
+        (99.999, 0.001, 0),
+        (-std::f32::consts::PI, -2.86, 9),
+        (1.5, 1.5, 2),
+    ];
+    let mut sandbox = SandboxBuilder::new().build()?;
+    sandbox
+        .register(
+            "GetTimeSinceBootMicrosecond",
+            get_time_since_boot_microsecond,
+        )
+        .unwrap();
+    let wasm_sandbox = sandbox.load_runtime()?;
+    let mod_path = get_wasm_module_path("RunWasm.aot")?;
+    let mut loaded_wasm_sandbox = wasm_sandbox.load_module(mod_path)?;
+    let snapshot = loaded_wasm_sandbox.snapshot()?;
+
+    for (idx, case) in tests.iter().enumerate() {
+        let (a, b, expected_result): (f32, f32, i32) = *case;
+        let result: i32 = loaded_wasm_sandbox.call_guest_function("RoundToNearestInt", (a, b))?;
+        assert_eq!(
+            result, expected_result,
+            "RoundToInt test case {idx} failed: got {}, expected {}",
+            result, expected_result
+        );
+        loaded_wasm_sandbox.restore(&snapshot)?
+    }
     Ok(())
 }

src/wasm_runtime/.cargo/config.toml

@@ -7,6 +7,8 @@ rustflags = [
   "code-model=small",
   "-C",
   "link-args=-e entrypoint",
+  "-C",
+  "target-feature=-soft-float,+sse,+sse2"
 ]
 linker = "rust-lld"
 

src/wasmsamples/RunWasm.c

@@ -20,6 +20,7 @@ limitations under the License.
 #include <limits.h>
 #include <stdint.h>
 #include <ctype.h>
+#include <math.h>
 
 int HostPrint(char* msg); // Implementation of this will be available in the native host
 
@@ -129,3 +130,12 @@ int KeepCPUBusy(int ms)
     printf("Kept CPU busy for %d ms using %d iterations of fib(10) %d|toreach max = %d|", ms, iter, INT_MAX, INT_MAX-iter);
     return ms;
 }
+
+__attribute__((export_name("RoundToNearestInt"))) 
+int RoundToNearestInt(float a, float b)
+{
+    float c = a*b;
+    float r = lrintf(c);
+    printf("rounded answer: %f\n", r);
+    return r;
+}

src/wasmsamples/components/runcomponent.c

@@ -1,11 +1,19 @@
 #include "bindings/runcomponent.h"
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 
 void exports_example_runcomponent_guest_echo(runcomponent_string_t *msg, runcomponent_string_t *ret)
 {
   ret->len = msg->len;
   ret->ptr = (uint8_t *) malloc(ret->len);
   memcpy(ret->ptr, msg->ptr, ret->len);
   runcomponent_string_free(msg);
+}
+
+int32_t exports_example_runcomponent_guest_round_to_nearest_int(float a, float b)
+{
+    float c = a*b;
+    float r = lrintf(c);
+    return r;
 }

src/wasmsamples/components/runcomponent.wit

@@ -2,6 +2,7 @@ package example:runcomponent;
 
 interface guest {
     echo: func(msg: string) -> string;
+    round-to-nearest-int: func(a: f32, b: f32) -> s32;
 }
 
 interface host {