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-rw-r--r--example/std_example.rs1
-rw-r--r--src/intrinsics.rs3
2 files changed, 4 insertions, 0 deletions
diff --git a/example/std_example.rs b/example/std_example.rs
index 61182a49b9c..2aa2235d7bd 100644
--- a/example/std_example.rs
+++ b/example/std_example.rs
@@ -35,6 +35,7 @@ fn main() {
     println!("{}", 2.3f32.max(1.0));
     println!("{}", 2.3f32.powi(2));
     println!("{}", 2.3f32.log2());
+    assert_eq!(2.3f32.copysign(-1.0), -2.3f32);
 
     assert_eq!(0b0000000000000000000000000010000010000000000000000000000000000000_0000000000100000000000000000000000001000000000000100000000000000u128.leading_zeros(), 26);
     assert_eq!(0b0000000000000000000000000010000000000000000000000000000000000000_0000000000000000000000000000000000001000000000000000000010000000u128.trailing_zeros(), 7);
diff --git a/src/intrinsics.rs b/src/intrinsics.rs
index 74d5e95091f..1c14278866c 100644
--- a/src/intrinsics.rs
+++ b/src/intrinsics.rs
@@ -326,8 +326,11 @@ pub fn codegen_intrinsic_call<'tcx>(
         fabsf64(flt) -> f64 => fabs,
         fmaf32(x, y, z) -> f32 => fmaf,
         fmaf64(x, y, z) -> f64 => fma,
+        copysignf32(x, y) -> f32 => copysignf,
+        copysignf64(x, y) -> f64 => copysign,
 
         // rounding variants
+        // FIXME use clif insts
         floorf32(flt) -> f32 => floorf,
         floorf64(flt) -> f64 => floor,
         ceilf32(flt) -> f32 => ceilf,