2d25db047f
Cranelift only has one instruction SIMD which depends on SSE4.2 so this commit adds a lowering rule for `pcmpgtq` which doesn't use SSE4.2 and enables lowering the baseline requirement for SIMD support from SSE4.2 to SSE4.1. The `has_sse42` setting is no longer enabled by default for Cranelift. Additionally `enable_simd` no longer requires `has_sse42` on x64. Finally the fuzz-generator for Wasmtime codegen settings now enables flipping the `has_sse42` setting instead of unconditionally setting it to `true`. The specific lowering for `pcmpgtq` is copied from LLVM's lowering of this instruction.
Fuzzing Infrastructure for Wasmtime
This crate provides test case generators and oracles for use with fuzzing.
These generators and oracles are generally independent of the fuzzing engine
that might be using them and driving the whole fuzzing process (e.g. libFuzzer
or AFL). As such, this crate does not contain any actual fuzz targets
itself. Those are generally just a couple lines of glue code that plug raw input
from (for example) libFuzzer into a generator, and then run one or more
oracles on the generated test case.
If you're looking for the actual fuzz target definitions we currently have, they
live in wasmtime/fuzz/fuzz_targets/* and are driven by cargo fuzz and
libFuzzer.