Changes in constants.rs

0e9121da - Fix some typos (#8641)

Thu, 16 May 2024 23:21:22 +0000

Fix some typos (#8641)* occurred* winch typos* tests typos* cli typos* fuzz typos* examples typos* docs typos* crates/wasmtime typos* crates/environ typos* crates/cranelift typos* crates/test-programs typos* crates/c-api typos* crates/cache typos* crates other typos* cranelift/codegen/src/isa typos* cranelift/codegen/src other typos* cranelift/codegen other typos* cranelift other typos* ci js typo* .github workflows typo* RELEASES typo* Fix clang-format documentation line---------Co-authored-by: Andrew Brown List of files: /wasmtime-44.0.1/cranelift/codegen/shared/src/constants.rs

9c43749d - [RFC] Dynamic Vector Support (#4200)

Thu, 07 Jul 2022 19:54:39 +0000

[RFC] Dynamic Vector Support (#4200)Introduce a new concept in the IR that allows a producer to create dynamic vector types. An IR function can now contain global value(s) that represent a dynamic scaling factor, for a given fixed-width vector type. A dynamic type is then created by 'multiplying' the corresponding global value with a fixed-width type. These new types can be used just like the existing types and the type system has a set of hard-coded dynamic types, such as I32X4XN, which the user defined types map onto. The dynamic types are also used explicitly to create dynamic stack slots, which have no set size like their existing counterparts. New IR instructions are added to access these new stack entities. Currently, during codegen, the dynamic scaling factor has to be lowered to a constant so the dynamic slots do eventually have a compile-time known size, as do spill slots. The current lowering for aarch64 just targets Neon, using a dynamic scale of 1. Copyright (c) 2022, Arm Limited. List of files: /wasmtime-44.0.1/cranelift/codegen/shared/src/constants.rs

00f357c0 - Cranelift: support 14-bit Type index with some bitpacking. (#4269)

Tue, 05 Jul 2022 21:51:02 +0000

Cranelift: support 14-bit Type index with some bitpacking. (#4269)* Cranelift: make `ir::Type` a `u16`. * Cranelift: pack ValueData back into 64 bits. After extending `Type` to a `u16`, `ValueData` became 12 bytes rather than 8. This packs it back down to 8 bytes (64 bits) by stealing two bits from the `Type` for the enum discriminant (leaving 14 bits for the type itself). Performance comparison (3-way between original (`ty-u8`), 16-bit `Type` (`ty-u16`), and this PR (`ty-packed`)): ``` ~/work/sightglass% target/release/sightglass-cli benchmark \ -e ~/ty-u8.so -e ~/ty-u16.so -e ~/ty-packed.so \ --iterations-per-process 10 --processes 2 \ benchmarks-next/spidermonkey/benchmark.wasm compilation benchmarks-next/spidermonkey/benchmark.wasm cycles [20654406874 21749213920.50 22958520306] /home/cfallin/ty-packed.so [22227738316 22584704883.90 22916433748] /home/cfallin/ty-u16.so [20659150490 21598675968.60 22588108428] /home/cfallin/ty-u8.so nanoseconds [5435333269 5723139427.25 6041072883] /home/cfallin/ty-packed.so [5848788229 5942729637.85 6030030341] /home/cfallin/ty-u16.so [5436002390 5683248226.10 5943626225] /home/cfallin/ty-u8.so ``` So, when compiling SpiderMonkey.wasm, making `Type` 16 bits regresses performance by 4.5% (5.683s -> 5.723s), while this PR gets 14 bits for a 1.0% cost (5.683s -> 5.723s). That's still not great, and we can likely do better, but it's a start. * Fix test failure: entities to/from u32 via `{from,to}_bits`, not `{from,to}_u32`. List of files: /wasmtime-44.0.1/cranelift/codegen/shared/src/constants.rs

4c75616a - Remove unused constants from cranelift-codegen-shared (#3479)

Thu, 18 Nov 2021 17:51:35 +0000

Remove unused constants from cranelift-codegen-shared (#3479) List of files: /wasmtime-44.0.1/cranelift/codegen/shared/src/constants.rs

f6688695 - Share constants between codegen and the meta crate;

Wed, 09 Oct 2019 15:38:29 +0000

Share constants between codegen and the meta crate; List of files: /wasmtime-44.0.1/cranelift/codegen/shared/src/constants.rs