Include ldexp* intrinsics on the wasm target

alexcrichton · alexcrichton · commit 4012b9c4f514 · 2019-05-02T12:40:39.000-07:00
Looks like LLVM optimizes programs like:

    fn foo(a: u8) -&gt; f32 {
        2.0f32.powf(a as f32)
    }

to actually invoking `ldexpf`, so let's be sure to include bindings so
there's not undefined symbols.
diff --git a/libm b/libm
@@ -1 +1 @@
-Subproject commit 3559e703795d33e84a91da2a35f2f3baac47e872
+Subproject commit 0ae442888c7af72c0a335edd43dbbd74c751f119
diff --git a/src/math.rs b/src/math.rs
@@ -71,6 +71,8 @@ no_mangle! {
     fn sinhf(n: f32) -> f32;
     fn tanf(n: f32) -> f32;
     fn tanhf(n: f32) -> f32;
+    fn ldexp(f: f64, n: i32) -> f64;
+    fn ldexpf(f: f32, n: i32) -> f32;
 }
 
 #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]

Original file line number	Diff line number	Diff line change
`@@ -71,6 +71,8 @@ no_mangle! {`
`71`	`71`	`fn sinhf(n: f32) -> f32;`
`72`	`72`	`fn tanf(n: f32) -> f32;`
`73`	`73`	`fn tanhf(n: f32) -> f32;`
	`74`	`+ fn ldexp(f: f64, n: i32) -> f64;`
	`75`	`+ fn ldexpf(f: f32, n: i32) -> f32;`
`74`	`76`	`}`
`75`	`77`
`76`	`78`	`#[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]`