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rust/compiler/rustc_codegen_ssa
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bors 7aa413d592 Auto merge of #107921 - cjgillot:codegen-overflow-check, r=tmiasko 
Make codegen choose whether to emit overflow checks

ConstProp and DataflowConstProp currently have a specific code path not to propagate constants when they overflow. This is meant to have the correct behaviour when inlining from a crate with overflow checks (like `core`) into a crate compiled without.

This PR shifts the behaviour change to the `Assert(Overflow*)` MIR terminators: if the crate is compiled without overflow checks, just skip emitting the assertions. This is already what happens with `OverflowNeg`.

This allows ConstProp and DataflowConstProp to transform `CheckedBinaryOp(Add, u8::MAX, 1)` into `const (0, true)`, and let codegen ignore the `true`.

 The interpreter is modified to conform to this behaviour.

Fixes #35310
2023-02-19 18:17:26 +00:00
..
src Auto merge of #107921 - cjgillot:codegen-overflow-check, r=tmiasko 2023-02-19 18:17:26 +00:00
Cargo.toml remove unused imports 2023-02-06 17:40:18 +03:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.