Use wasm32 arch intrinsics for rint{,f}

Author: hanna-kruppe

src/math/arch/mod.rs

@@ -11,7 +11,9 @@
 cfg_if! {
     if #[cfg(all(target_arch = "wasm32", intrinsics_enabled))] {
         mod wasm32;
-        pub use wasm32::{ceil, ceilf, fabs, fabsf, floor, floorf, sqrt, sqrtf, trunc, truncf};
+        pub use wasm32::{
+            ceil, ceilf, fabs, fabsf, floor, floorf, rint, rintf, sqrt, sqrtf, trunc, truncf,
+        };
     } else if #[cfg(target_feature = "sse2")] {
         mod i686;
         pub use i686::{sqrt, sqrtf};

src/math/arch/wasm32.rs

@@ -25,6 +25,14 @@ pub fn floorf(x: f32) -> f32 {
     core::arch::wasm32::f32_floor(x)
 }
 
+pub fn rint(x: f64) -> f64 {
+    core::arch::wasm32::f64_nearest(x)
+}
+
+pub fn rintf(x: f32) -> f32 {
+    core::arch::wasm32::f32_nearest(x)
+}
+
 pub fn sqrt(x: f64) -> f64 {
     core::arch::wasm32::f64_sqrt(x)
 }

src/math/rint.rs

@@ -1,5 +1,11 @@
 #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
 pub fn rint(x: f64) -> f64 {
+    select_implementation! {
+        name: rint,
+        use_arch: all(target_arch = "wasm32", intrinsics_enabled),
+        args: x,
+    }
+
     let one_over_e = 1.0 / f64::EPSILON;
     let as_u64: u64 = x.to_bits();
     let exponent: u64 = (as_u64 >> 52) & 0x7ff;

src/math/rintf.rs

@@ -1,5 +1,11 @@
 #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
 pub fn rintf(x: f32) -> f32 {
+    select_implementation! {
+        name: rintf,
+        use_arch: all(target_arch = "wasm32", intrinsics_enabled),
+        args: x,
+    }
+
     let one_over_e = 1.0 / f32::EPSILON;
     let as_u32: u32 = x.to_bits();
     let exponent: u32 = (as_u32 >> 23) & 0xff;