1 files changed, 29 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/libm/src/math/scalbnf.rs b/vendor/compiler_builtins/libm/src/math/scalbnf.rs
new file mode 100644
index 000000000..73f4bb57a
--- /dev/null
+++ b/vendor/compiler_builtins/libm/src/math/scalbnf.rs
@@ -0,0 +1,29 @@
+#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
+pub fn scalbnf(mut x: f32, mut n: i32) -> f32 {
+    let x1p127 = f32::from_bits(0x7f000000); // 0x1p127f === 2 ^ 127
+    let x1p_126 = f32::from_bits(0x800000); // 0x1p-126f === 2 ^ -126
+    let x1p24 = f32::from_bits(0x4b800000); // 0x1p24f === 2 ^ 24
+
+    if n > 127 {
+        x *= x1p127;
+        n -= 127;
+        if n > 127 {
+            x *= x1p127;
+            n -= 127;
+            if n > 127 {
+                n = 127;
+            }
+        }
+    } else if n < -126 {
+        x *= x1p_126 * x1p24;
+        n += 126 - 24;
+        if n < -126 {
+            x *= x1p_126 * x1p24;
+            n += 126 - 24;
+            if n < -126 {
+                n = -126;
+            }
+        }
+    }
+    x * f32::from_bits(((0x7f + n) as u32) << 23)
+}