diff options
3 files changed, 41 insertions, 0 deletions
diff --git a/src/tools/miri/bench-cargo-miri/slice-chunked/Cargo.lock b/src/tools/miri/bench-cargo-miri/slice-chunked/Cargo.lock new file mode 100644 index 00000000000..0f9e5db52d6 --- /dev/null +++ b/src/tools/miri/bench-cargo-miri/slice-chunked/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "slice-chunked" +version = "0.1.0" diff --git a/src/tools/miri/bench-cargo-miri/slice-chunked/Cargo.toml b/src/tools/miri/bench-cargo-miri/slice-chunked/Cargo.toml new file mode 100644 index 00000000000..8fed6ad2f31 --- /dev/null +++ b/src/tools/miri/bench-cargo-miri/slice-chunked/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "slice-chunked" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] diff --git a/src/tools/miri/bench-cargo-miri/slice-chunked/src/main.rs b/src/tools/miri/bench-cargo-miri/slice-chunked/src/main.rs new file mode 100644 index 00000000000..b498c8bec75 --- /dev/null +++ b/src/tools/miri/bench-cargo-miri/slice-chunked/src/main.rs @@ -0,0 +1,26 @@ +//! This is a small example using slice::chunks, which creates a very large Tree Borrows tree. +//! Thanks to ##3837, the GC now compacts the tree, so this test can be run in a reasonable time again. +//! The actual code is adapted from tiny_skia, see https://github.com/RazrFalcon/tiny-skia/blob/master/src/pixmap.rs#L121 +//! To make this benchmark demonstrate the effectiveness, run with MIRIFLAGS="-Zmiri-tree-borrows -Zmiri-provenance-gc=100" + +const N: usize = 1000; + +fn input_vec() -> Vec<u8> { + vec![0; N] +} + +fn main() { + let data_len = 2 * N; + let mut rgba_data = Vec::with_capacity(data_len); + let img_data = input_vec(); + for slice in img_data.chunks(2) { + let gray = slice[0]; + let alpha = slice[1]; + rgba_data.push(gray); + rgba_data.push(gray); + rgba_data.push(gray); + rgba_data.push(alpha); + } + + assert_eq!(rgba_data.len(), data_len); +} |