bjoernager/rust
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Auto merge of #108442 - scottmcm:mir-transmute, r=oli-obk

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Add `CastKind::Transmute` to MIR

~~Nothing actually produces it in this commit, so I don't know how to test it, but it also means it shouldn't be possible for it to break anything.~~

Includes lowering `transmute` calls to it, so it's used.

Zulip Conversation: <321849610>
This commit is contained in:
bors 2023-03-23 18:43:04 +00:00
commit e216300876
55 changed files with 955 additions and 190 deletions
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4
compiler/rustc_codegen_cranelift/src/base.rs
View file

@ -709,6 +709,10 @@ fn codegen_stmt<'tcx>(
let operand = codegen_operand(fx, operand);
operand.coerce_dyn_star(fx, lval);
}
Rvalue::Cast(CastKind::Transmute, ref operand, _to_ty) => {
let operand = codegen_operand(fx, operand);
lval.write_cvalue_transmute(fx, operand);
}
Rvalue::Discriminant(place) => {
let place = codegen_place(fx, place);
let value = place.to_cvalue(fx);

10
compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
View file

@ -557,16 +557,6 @@ fn codegen_regular_intrinsic_call<'tcx>(
fx.bcx.ins().band(ptr, mask);
}
sym::transmute => {
intrinsic_args!(fx, args => (from); intrinsic);
if ret.layout().abi.is_uninhabited() {
crate::base::codegen_panic(fx, "Transmuting to uninhabited type.", source_info);
return;
}
ret.write_cvalue_transmute(fx, from);
}
sym::write_bytes | sym::volatile_set_memory => {
intrinsic_args!(fx, args => (dst, val, count); intrinsic);
let val = val.load_scalar(fx);