bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Avoid looking at HIR for inline const pattern literals

Browse source
This commit is contained in:
Oli Scherer 2024-12-05 08:08:19 +00:00
parent 5a0a5e6db9
commit 44019ee330
1 changed files with 0 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

24
compiler/rustc_mir_build/src/thir/pattern/mod.rs
View file

@ -620,32 +620,8 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
) -> PatKind<'tcx> {
let tcx = self.tcx;
let def_id = block.def_id;
let body_id = block.body;
let expr = &tcx.hir().body(body_id).value;
let ty = tcx.typeck(def_id).node_type(block.hir_id);
// Special case inline consts that are just literals. This is solely
// a performance optimization, as we could also just go through the regular
// const eval path below.
// FIXME: investigate the performance impact of removing this.
let lit_input = match expr.kind {
hir::ExprKind::Lit(lit) => Some(LitToConstInput { lit: &lit.node, ty, neg: false }),
hir::ExprKind::Unary(hir::UnOp::Neg, expr) => match expr.kind {
hir::ExprKind::Lit(lit) => Some(LitToConstInput { lit: &lit.node, ty, neg: true }),
_ => None,
},
_ => None,
};
if let Some(lit_input) = lit_input {
match tcx.at(expr.span).lit_to_const(lit_input) {
Ok(c) => return self.const_to_pat(c, ty, id, span).kind,
// If an error occurred, ignore that it's a literal
// and leave reporting the error up to const eval of
// the unevaluated constant below.
Err(_) => {}
}
}
let typeck_root_def_id = tcx.typeck_root_def_id(def_id.to_def_id());
let parent_args =
tcx.erase_regions(ty::GenericArgs::identity_for_item(tcx, typeck_root_def_id));