0.8.5 more perf? more perf!

Author: maciejhirsz

src/codegen.rs

@@ -63,6 +63,7 @@ pub trait Generator {
         self.write_char(b'"');
     }
 
+    #[inline(always)]
     fn write_string(&mut self, string: &str) {
         self.write_char(b'"');
 
@@ -80,7 +81,7 @@ pub trait Generator {
         match num.classify() {
             FpCategory::Normal    |
             FpCategory::Subnormal => {
-                if num.fract() == 0.0 && num < 1e19 {
+                if num.fract() == 0.0 && num.abs() < 1e19 {
                     itoa::write(self.get_buffer(), num as i64).unwrap();
                 } else {
                     let abs = num.abs();

src/parser.rs

@@ -393,12 +393,16 @@ impl<'a> Parser<'a> {
 
     fn read_number_with_fraction(&mut self, mut num: f64) -> JsonResult<f64> {
         if next_byte!(self || return Ok(num)) == b'.' {
-            let mut precision = 0.1;
+            let mut p = 1u64;
+            let mut f = 0u64;
 
+            // FIXME: prevent overflowing!
             read_num!(self, digit, {
-                num += (digit as f64) * precision;
-                precision /= 10.0;
+                f = (f << 1) + (f << 3) + digit as u64;
+                p = (p << 1) + (p << 3);
             });
+
+            num += (f as f64) / (p as f64);
         } else {
             self.index -= 1;
         }