Try using FMA ops

vertexclique · vertexclique · commit d255996c3d1b · 2020-04-12T15:50:18.000+02:00
diff --git a/src/libstd/f32.rs b/src/libstd/f32.rs
@@ -934,7 +934,7 @@ impl f32 {
     #[unstable(feature = "lerp", issue = "71015")]
     #[inline]
     pub fn lerp(self, upper: f32, pol: f32) -> f32 {
-        self * (1_f32 - pol) + upper * pol
+        unsafe { intrinsics::fmaf32(self, 1_f32 - pol, upper * pol) }
     }
 }
 
diff --git a/src/libstd/f64.rs b/src/libstd/f64.rs
@@ -936,7 +936,7 @@ impl f64 {
     #[unstable(feature = "lerp", issue = "71015")]
     #[inline]
     pub fn lerp(self, upper: f64, pol: f64) -> f64 {
-        self * (1_f64 - pol) + upper * pol
+        unsafe { intrinsics::fmaf64(self, 1_f64 - pol, upper * pol) }
     }
 
     // Solaris/Illumos requires a wrapper around log, log2, and log10 functions

Original file line number	Diff line number	Diff line change
`@@ -934,7 +934,7 @@ impl f32 {`
`934`	`934`	`#[unstable(feature = "lerp", issue = "71015")]`
`935`	`935`	`#[inline]`
`936`	`936`	`pub fn lerp(self, upper: f32, pol: f32) -> f32 {`
`937`		`- self * (1_f32 - pol) + upper * pol`
	`937`	`+ unsafe { intrinsics::fmaf32(self, 1_f32 - pol, upper * pol) }`
`938`	`938`	`}`
`939`	`939`	`}`
`940`	`940`
Original file line number	Diff line number	Diff line change
`@@ -936,7 +936,7 @@ impl f64 {`
`936`	`936`	`#[unstable(feature = "lerp", issue = "71015")]`
`937`	`937`	`#[inline]`
`938`	`938`	`pub fn lerp(self, upper: f64, pol: f64) -> f64 {`
`939`		`- self * (1_f64 - pol) + upper * pol`
	`939`	`+ unsafe { intrinsics::fmaf64(self, 1_f64 - pol, upper * pol) }`
`940`	`940`	`}`
`941`	`941`
`942`	`942`	`// Solaris/Illumos requires a wrapper around log, log2, and log10 functions`