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Lower the assume intrinsic to a MIR statement

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This commit is contained in:
Oli Scherer 2022-06-30 08:16:05 +00:00
parent 3c72788461
commit 3f07645120
33 changed files with 212 additions and 30 deletions
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8
compiler/rustc_middle/src/mir/syntax.rs
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@ -342,6 +342,14 @@ pub enum StatementKind<'tcx> {
/// I vaguely remember Ralf saying somewhere that he thought it should not be.
CopyNonOverlapping(Box<CopyNonOverlapping<'tcx>>),
/// Denotes a call to the intrinsic function `assume`.
///
/// The operand must be a boolean. Optimizers may use the value of the boolean to backtrack its
/// computation to infer information about other variables. So if the boolean came from a
/// `x < y` operation, subsequent operations on `x` and `y` could elide various bound checks.
/// If the argument is `false`, this operation is equivalent to `TerminatorKind::Unreachable`.
Assume(Box<Operand<'tcx>>),
/// No-op. Useful for deleting instructions without affecting statement indices.
Nop,
}