bench-criterion base program
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version = 3
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[[package]]
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name = "c-bindings"
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name = "bench-criterion"
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version = "0.1.0"
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dependencies = [
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"cc",
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"cty",
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]
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[[package]]
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name = "cc"
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version = "1.0.83"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
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dependencies = [
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"libc",
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]
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[[package]]
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name = "cty"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b365fabc795046672053e29c954733ec3b05e4be654ab130fe8f1f94d7051f35"
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[[package]]
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name = "libc"
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version = "0.2.147"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
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[[package]]
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name = "rs-basic"
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version = "0.1.0"
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version = "0.2.0"
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publish = false
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members = [
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".",
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"members/bench-criterion",
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]
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default-members = [
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".",
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"members/bench-criterion",
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]
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[package]
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name = "rs-basic"
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version = "0.1.0"
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version = "0.2.0"
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edition = "2021"
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authors = ["Christoph J. Scherr <softwar@cscherr.de>"]
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publish = false
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@ -0,0 +1,8 @@
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[package]
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name = "bench-criterion"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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fn main() {
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let n: f32 = std::env::args().collect::<Vec<String>>()[1]
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.parse::<f32>()
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.expect("bad input number");
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println!("rsqrt:\t\t{}", inverse_sqrt(n));
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println!("f_rsqrt:\t{}", fast_inverse_sqrt(n));
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}
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fn inverse_sqrt(n: f32) -> f32 {
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1f32 / n.sqrt()
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}
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union MixedIntFloat {
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f: f32,
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i: u32,
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}
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/// see https://en.wikipedia.org/wiki/Fast_inverse_square_root
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fn fast_inverse_sqrt(n: f32) -> f32 {
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let mut conv: MixedIntFloat = MixedIntFloat { f: n };
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unsafe {
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conv.i = 0x5f3759df - (conv.i >> 1);
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conv.f *= 1.5f32 - (n* 0.5f32 * conv.f * conv.f);
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conv.f
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}
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}
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