2.5.0: Add u64 -> Float conversion

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tifloats"
-version = "2.4.0"
+version = "2.5.0"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/TI-Toolkit/tifloats_lib_rs"

benches/float.rs

@@ -1,3 +1,4 @@
+use std::hint::black_box;
 use criterion::{criterion_group, criterion_main, Criterion};
 use tifloats::{tifloat, Float};
 
@@ -37,6 +38,14 @@ fn criterion_benchmark(c: &mut Criterion) {
             );
         })
     });
+
+    c.bench_function("float_from_num", |b| {
+        b.iter(|| {
+            let n = black_box(tifloats::Float::from(12345));
+
+            assert_eq!(n, tifloat!(0x12345000000000 * 10 ^ 4));
+        })
+    });
 }
 
 criterion_group!(benches, criterion_benchmark);

src/float.rs

@@ -336,6 +336,19 @@ impl Debug for Float {
     }
 }
 
+impl From<u64> for Float {
+    fn from(value: u64) -> Self {
+        if value == 0 {
+            Float::new_unchecked(false, 0, 0)
+        } else {
+            let exp = value.ilog10() as i8;
+            let mantissa = Mantissa::from_dec_normalized(value);
+
+            Float::new_unchecked(false, exp, mantissa.0.bits())
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/mantissa.rs

@@ -14,7 +14,7 @@ const DEC_TO_BCD: [u64; 100] = [
 ];
 
 #[derive(Copy, Clone, Debug)]
-pub(super) struct Mantissa {
+pub(crate) struct Mantissa {
     data: u64,
 }
 
@@ -115,6 +115,18 @@ impl Mantissa {
 
         Mantissa { data: result }
     }
+
+    pub fn from_dec_normalized(mut data: u64) -> (Self, u8) {
+        if data == 0 {
+            return (Mantissa::from_unchecked(data), 0)
+        }
+
+        let mut mantissa = Mantissa::from_dec(data);
+
+        let mut count = (mantissa.data.leading_zeros()/4) as u8 - 2;
+
+        (mantissa.shl(count), count)
+    }
 }
 
 impl Add for Mantissa {