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Make Rust rotate code smaller (#462)

Browse Source 
* 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
View File

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

29
codecs/rotate/rotate.rs
View File

@@ -1,8 +1,22 @@
#![no_std] use std::slice::from_raw_parts_mut;
#![no_main]
use core::panic::PanicInfo; // This function is taken from
use core::slice::from_raw_parts_mut; // 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] #[no_mangle]
fn rotate(input_width: isize, input_height: isize, rotate: isize) { 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 d2 in 0..d2_limit {
for d1 in 0..d1_limit { for d1 in 0..d1_limit {
let in_idx = (d1_start + d1 * d1_advance) * d1_multiplier + (d2_start + d2 * d2_advance) * d2_multiplier; 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; i += 1;
} }
} }
} }
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
loop {}
}

BIN
codecs/rotate/rotate.wasm
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Binary file not shown.

82
package-lock.json generated
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@@ -2283,7 +2283,8 @@
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@@ -5851,7 +5870,8 @@
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@@ -6366,6 +6401,7 @@
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"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=", "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
"dev": true, "dev": true,
"optional": true,
"requires": { "requires": {
"ansi-regex": "^2.0.0" "ansi-regex": "^2.0.0"
} }
@@ -6414,13 +6450,15 @@
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"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
"integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=", "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
"dev": true "dev": true,
"optional": true
}, },
"yallist": { "yallist": {
"version": "3.0.2", "version": "3.0.2",
"resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz", "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.2.tgz",
"integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k=", "integrity": "sha1-hFK0u36Dx8GI2AQcGoN8dz1ti7k=",
"dev": true "dev": true,
"optional": true
} }
} }
}, },