From 29949505d63df8bd3d9d4a21913aabe38b2a3012 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 2 Apr 2021 10:07:59 -0500
Subject: [PATCH] Fix printing float results from the CLI (#2797)

Previously their bit patterns were printed interpreted as decimals, now
they're printed as floats.
---
 src/commands/run.rs    |  6 +++---
 tests/all/cli_tests.rs | 20 ++++++++++++++++++++
 tests/wasm/simple.wat  |  4 +++-
 3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/src/commands/run.rs b/src/commands/run.rs
index f8b7010146..abc54bf9b1 100644
--- a/src/commands/run.rs
+++ b/src/commands/run.rs
@@ -333,10 +333,10 @@ impl RunCommand {
             match result {
                 Val::I32(i) => println!("{}", i),
                 Val::I64(i) => println!("{}", i),
-                Val::F32(f) => println!("{}", f),
-                Val::F64(f) => println!("{}", f),
+                Val::F32(f) => println!("{}", f32::from_bits(f)),
+                Val::F64(f) => println!("{}", f64::from_bits(f)),
                 Val::ExternRef(_) => println!("<externref>"),
-                Val::FuncRef(_) => println!("<externref>"),
+                Val::FuncRef(_) => println!("<funcref>"),
                 Val::V128(i) => println!("{}", i),
             }
         }
diff --git a/tests/all/cli_tests.rs b/tests/all/cli_tests.rs
index 5c825cd590..ae09dd97cd 100644
--- a/tests/all/cli_tests.rs
+++ b/tests/all/cli_tests.rs
@@ -97,6 +97,26 @@ fn run_wasmtime_simple_wat() -> Result<()> {
         "--disable-cache",
         "4",
     ])?;
+    assert_eq!(
+        run_wasmtime(&[
+            "run",
+            wasm.path().to_str().unwrap(),
+            "--invoke",
+            "get_f32",
+            "--disable-cache",
+        ])?,
+        "100\n"
+    );
+    assert_eq!(
+        run_wasmtime(&[
+            "run",
+            wasm.path().to_str().unwrap(),
+            "--invoke",
+            "get_f64",
+            "--disable-cache",
+        ])?,
+        "100\n"
+    );
     Ok(())
 }
 
diff --git a/tests/wasm/simple.wat b/tests/wasm/simple.wat
index 7b618ee429..a851dfa00e 100644
--- a/tests/wasm/simple.wat
+++ b/tests/wasm/simple.wat
@@ -2,4 +2,6 @@
     (func (export "simple") (param i32) (result i32)
         local.get 0
     )
-)
\ No newline at end of file
+    (func (export "get_f32") (result f32) f32.const 100)
+    (func (export "get_f64") (result f64) f64.const 100)
+)