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2695093a03
863: Rewrite Min/Max to handle all cases correctly. Fixes 545 spectest failures. r=nlewycky a=nlewycky
# Description
The llvm backend was not quite following the Wasm spec for {F32,F64,F32x4xF64x2}{Min,Max}. We used the `@llvm.minnum` and `@llvm.maxnum` intrinsics which don't handle the corner cases the same. When we tried to use `@llvm.minimum` and `@llvm.maximum` which do, we get an internal error from the x86 backend. I was hoping that crash would go away with the upgrade to LLVM 9, but it does not.
Reimplement these operations using plain LLVM instructions.
# Review
- [x] Add a short description of the the change to the CHANGELOG.md file
Co-authored-by: Nick Lewycky <nick@wasmer.io>
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| clif-backend | ||
| dev-utils | ||
| emscripten | ||
| emscripten-tests | ||
| kernel-loader | ||
| kernel-net | ||
| llvm-backend | ||
| middleware-common | ||
| middleware-common-tests | ||
| runtime | ||
| runtime-c-api | ||
| runtime-core | ||
| singlepass-backend | ||
| spectests | ||
| wasi | ||
| wasi-tests | ||
| win-exception-handler | ||
| .gitignore | ||
| README.md | ||
Wasmer Libraries
Wasmer is modularized into different libraries, separated into three main sections:
Runtime
The core of Wasmer is the runtime, which provides the necessary abstractions to create a good user experience when embedding.
The runtime is divided into two main libraries:
- runtime-core: The main implementation of the runtime.
- runtime: Easy-to-use API on top of
runtime-core.
Integrations
The integration builds on the Wasmer runtime and allow us to run WebAssembly files compiled for different environments.
Wasmer intends to support different integrations:
- WASI: run WebAssembly files with the WASI ABI.
- Emscripten: run Emscripten-generated WebAssembly files, such as Lua or nginx.
- Go ABI: we will work on this soon! Want to give us a hand? ✋
- Blazor: research period, see tracking issue
Backends
The Wasmer runtime is designed to support multiple compiler backends, allowing the user to tune the codegen properties (compile speed, performance, etc) to best fit their use case.
Currently, we support multiple backends for compiling WebAssembly to machine code:
- singlepass-backend: Single pass backend - super fast compilation, slower runtime speed
- clif-backend: Cranelift backend - slower compilation, normal runtime speed
- llvm-backend: LLVM backend - slow compilation, native runtime speed