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Make Rust rotate code smaller (#462)

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* Make Rust rotate code smaller

* Back on the rust happy path
This commit is contained in:
Surma
2019-02-15 09:47:26 +00:00
committed by Jake Archibald
parent ca5162ed32
commit 91e7c9c5ad
6 changed files with 100 additions and 38 deletions
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2
codecs/rotate/.gitignore vendored Normal file
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@@ -0,0 +1,2 @@
target
Cargo.lock

14
codecs/rotate/Cargo.toml Normal file
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@@ -0,0 +1,14 @@
[package]
name = "rotate"
version = "0.1.0"
authors = ["Surma <surma@google.com>"]
edition = "2018"
[lib]
name = "rotate"
path = "rotate.rs"
crate-type = ["cdylib", "rlib"]
[profile.release]
lto = true
opt-level = "s"

11
codecs/rotate/build.sh
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@@ -7,12 +7,11 @@ echo "Compiling wasm"
echo "============================================="
(
rustup run nightly \
rustc \
--target=wasm32-unknown-unknown \
-C opt-level=3 \
-o rotate.wasm \
rotate.rs
wasm-strip rotate.wasm
cargo build \
--target wasm32-unknown-unknown \
--release
cp target/wasm32-unknown-unknown/release/rotate.wasm .
wasm-strip rotate.wasm
)
echo "============================================="
echo "Compiling wasm done"

29
codecs/rotate/rotate.rs
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@@ -1,8 +1,22 @@
#![no_std]
#![no_main]
use std::slice::from_raw_parts_mut;
use core::panic::PanicInfo;
use core::slice::from_raw_parts_mut;
// This function is taken from
// https://rustwasm.github.io/book/reference/code-size.html
#[cfg(not(debug_assertions))]
#[inline]
pub fn unwrap_abort<T>(o: Option<T>) -> T {
use std::process;
match o {
Some(t) => t,
None => process::abort(),
}
}
// Normal panic-y behavior for debug builds
#[cfg(debug_assertions)]
unsafe fn unchecked_unwrap<T>(o: Option<T>) -> T {
o.unwrap()
}
#[no_mangle]
fn rotate(input_width: isize, input_height: isize, rotate: isize) {
@@ -69,13 +83,8 @@ fn rotate(input_width: isize, input_height: isize, rotate: isize) {
for d2 in 0..d2_limit {
for d1 in 0..d1_limit {
let in_idx = (d1_start + d1 * d1_advance) * d1_multiplier + (d2_start + d2 * d2_advance) * d2_multiplier;
out_b[i as usize] = in_b[in_idx as usize];
*unwrap_abort(out_b.get_mut(i as usize)) = *unwrap_abort(in_b.get(in_idx as usize));
i += 1;
}
}
}
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
loop {}
}

BIN
codecs/rotate/rotate.wasm
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82
package-lock.json generated
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@@ -2283,7 +2283,8 @@
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@@ -2511,13 +2520,15 @@
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@@ -2538,6 +2549,7 @@
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@@ -2626,7 +2638,8 @@
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@@ -2640,6 +2653,7 @@
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"dev": true,
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"requires": {
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@@ -2735,7 +2749,8 @@
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"dev": true
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@@ -2777,6 +2792,7 @@
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@@ -2798,6 +2814,7 @@
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@@ -2846,13 +2863,15 @@
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"dev": true
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}
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@@ -5851,7 +5870,8 @@
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"dev": true
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@@ -5875,13 +5895,15 @@
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"dev": true
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"brace-expansion": {
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"dev": true,
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"concat-map": "0.0.1"
@@ -5898,19 +5920,22 @@
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"resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
"integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
"dev": true
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"concat-map": {
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"resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
"integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
"dev": true
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},
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"dev": true
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"optional": true
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"core-util-is": {
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@@ -6041,7 +6066,8 @@
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@@ -6055,6 +6081,7 @@
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@@ -6071,6 +6098,7 @@
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@@ -6079,13 +6107,15 @@
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@@ -6106,6 +6136,7 @@
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@@ -6345,6 +6379,7 @@
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@@ -6414,13 +6450,15 @@
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