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Add CastKind::Transmute to MIR

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Updates `interpret`, `codegen_ssa`, and `codegen_cranelift` to consume the new cast instead of the intrinsic.

Includes `CastTransmute` for custom MIR building, to be able to test the extra UB.
This commit is contained in:
Scott McMurray 2023-02-24 18:32:52 -08:00
parent a266f11990
commit 64cce5fc7d
55 changed files with 955 additions and 190 deletions
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4
compiler/rustc_mir_build/src/build/custom/parse/instruction.rs
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@ -137,6 +137,10 @@ impl<'tcx, 'body> ParseCtxt<'tcx, 'body> {
fn parse_rvalue(&self, expr_id: ExprId) -> PResult<Rvalue<'tcx>> {
parse_by_kind!(self, expr_id, expr, "rvalue",
@call("mir_discriminant", args) => self.parse_place(args[0]).map(Rvalue::Discriminant),
@call("mir_cast_transmute", args) => {
let source = self.parse_operand(args[0])?;
Ok(Rvalue::Cast(CastKind::Transmute, source, expr.ty))
},
@call("mir_checked", args) => {
parse_by_kind!(self, args[0], _, "binary op",
ExprKind::Binary { op, lhs, rhs } => Ok(Rvalue::CheckedBinaryOp(