Vendor dependencies for 0.3.0 release

vendor/const_soft_float/src/soft_f32/pow.rs

@@ -0,0 +1,37 @@
+use crate::abs_diff;
+use crate::soft_f32::SoftF32;
+
+type F = SoftF32;
+
+pub(crate) const fn pow(a: F, b: i32) -> F {
+    let mut a = a;
+    let recip = b < 0;
+    let mut pow = abs_diff(b, 0);
+    let mut mul = F::ONE;
+    loop {
+        if (pow & 1) != 0 {
+            mul = mul.mul(a);
+        }
+        pow >>= 1;
+        if pow == 0 {
+            break;
+        }
+        a = a.mul(a);
+    }
+
+    if recip {
+        F::ONE.div(mul)
+    } else {
+        mul
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::soft_f32::SoftF32;
+
+    #[test]
+    fn sanity_check() {
+        assert_eq!(SoftF32(2.0).powi(2).0, 4.0)
+    }
+}