forked from PuqiAR/Fig-TreeWalker
PuqiAR
ca4ae143b4
[Fix][Impl] 为了消除类构造带来的语法歧义，同时保持实现简洁和括号省略的语法，自此版本，引入了 `new` 操作符
造成歧义的原方法：
if a == A{}
条件是 a == A，还是 a == A{} ?
因此，现在使用 new a_struct{}来构造类
[Opti] 相较于 Fig v0.4.1-alpha版本，release O3同编译条件下
Fib普通递归法性能提升 ~50%
具体方式:
增加了小整数优化，-128~127的整数现在会直接从IntPool获取而不是新构造
...忘了
[Fix] 类构造 shorthand模式忘写了，现在补上了
[Feat][Impl] 类型声明现在接受一个表达式，原为Identifier。实现 var start: time.Time = time.now() 的效果
这是符合语法和语言特性的支持，类型为一等公民。类似Python的 <class 'type'>
[Impl] 修改了部分错误输出的细节
65 lines
1.1 KiB
Plaintext
65 lines
1.1 KiB
Plaintext
import std.io;
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import std.time;
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func benchmark(fn: Function, arg: Any) -> Null
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{
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io.println("Testing fn:", fn, "with arg:", arg);
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const start := time.now();
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const result := fn(arg);
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const end := time.now();
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const duration := new time.Time{
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end.since(start)
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};
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io.println("=" * 50);
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io.println("fn returns:", result, "\n");
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io.println("Cost:", duration.toSeconds(), "s");
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io.println(" ", duration.toMillis(), "ms");
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}
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var memo := {};
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func fib_memo(x)
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{
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if memo.contains(x)
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{
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return memo.get(x);
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}
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if x <= 1
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{
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memo[x] = x;
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return x;
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}
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var result := fib_memo(x - 1) + fib_memo(x - 2);
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memo[x] = result;
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return result;
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}
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func fib_iter(n)
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{
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var a := 0;
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var b := 1;
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for var i := 0; i < n; i = i + 1
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{
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var temp := a + b;
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a = b;
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b = temp;
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}
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return a;
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}
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func fib(x)
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{
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if x <= 1
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{
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return x;
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}
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return fib(x - 1) + fib(x - 2);
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}
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const n := 28;
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benchmark(fib, n);
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benchmark(fib_memo, n);
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benchmark(fib_iter, n); |