remove signnum from isinf

sunfishcode · Dec 29, 2023 · 48189b2 · 48189b2
1 parent 45a1a4b
commit 48189b2
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/c-scape/src/math/mod.rs b/c-scape/src/math/mod.rs
@@ -749,12 +749,24 @@ unsafe extern "C" fn isnanf(x: f32) -> i32 {
 
 #[no_mangle]
 unsafe extern "C" fn isinf(x: f64) -> i32 {
-    return (x.is_infinite() as i32) * x.signum() as i32;
+    if x == f64::INFINITY {
+        return 1;
+    } else if x == f64::NEG_INFINITY {
+        return -1;
+    } else {
+        return 0;
+    }
 }
 
 #[no_mangle]
 unsafe extern "C" fn isinff(x: f32) -> i32 {
-    return (x.is_infinite() as i32) * x.signum() as i32;
+    if x == f32::INFINITY {
+        return 1;
+    } else if x == f32::NEG_INFINITY {
+        return -1;
+    } else {
+        return 0;
+    }
 }
 
 // Enable support for complex numbers only on architectures where the builtin