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use crate::MirPass;
use rustc_middle::mir::*;
use rustc_middle::ty::TyCtxt;
use std::iter;
use super::simplify::simplify_cfg;
pub struct MatchBranchSimplification;
impl<'tcx> MirPass<'tcx> for MatchBranchSimplification {
fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
sess.mir_opt_level() >= 3
}
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
let def_id = body.source.def_id();
let param_env = tcx.param_env(def_id);
let bbs = body.basic_blocks.as_mut();
let mut should_cleanup = false;
'outer: for bb_idx in bbs.indices() {
if !tcx.consider_optimizing(|| format!("MatchBranchSimplification {:?} ", def_id)) {
continue;
}
let (discr, val, switch_ty, first, second) = match bbs[bb_idx].terminator().kind {
TerminatorKind::SwitchInt {
discr: ref discr @ (Operand::Copy(_) | Operand::Move(_)),
switch_ty,
ref targets,
..
} if targets.iter().len() == 1 => {
let (value, target) = targets.iter().next().unwrap();
if target == targets.otherwise() {
continue;
}
(discr, value, switch_ty, target, targets.otherwise())
}
_ => continue,
};
if bbs[first].terminator().kind != bbs[second].terminator().kind {
continue;
}
let first_stmts = &bbs[first].statements;
let scnd_stmts = &bbs[second].statements;
if first_stmts.len() != scnd_stmts.len() {
continue;
}
for (f, s) in iter::zip(first_stmts, scnd_stmts) {
match (&f.kind, &s.kind) {
(f_s, s_s) if f_s == s_s => {}
(
StatementKind::Assign(box (lhs_f, Rvalue::Use(Operand::Constant(f_c)))),
StatementKind::Assign(box (lhs_s, Rvalue::Use(Operand::Constant(s_c)))),
) if lhs_f == lhs_s
&& f_c.literal.ty().is_bool()
&& s_c.literal.ty().is_bool()
&& f_c.literal.try_eval_bool(tcx, param_env).is_some()
&& s_c.literal.try_eval_bool(tcx, param_env).is_some() => {}
_ => continue 'outer,
}
}
let discr = discr.clone();
let source_info = bbs[bb_idx].terminator().source_info;
let discr_local = body.local_decls.push(LocalDecl::new(switch_ty, source_info.span));
let (from, first, second) = bbs.pick3_mut(bb_idx, first, second);
let new_stmts = iter::zip(&first.statements, &second.statements).map(|(f, s)| {
match (&f.kind, &s.kind) {
(f_s, s_s) if f_s == s_s => (*f).clone(),
(
StatementKind::Assign(box (lhs, Rvalue::Use(Operand::Constant(f_c)))),
StatementKind::Assign(box (_, Rvalue::Use(Operand::Constant(s_c)))),
) => {
let f_b = f_c.literal.try_eval_bool(tcx, param_env).unwrap();
let s_b = s_c.literal.try_eval_bool(tcx, param_env).unwrap();
if f_b == s_b {
(*f).clone()
} else {
let size = tcx.layout_of(param_env.and(switch_ty)).unwrap().size;
let const_cmp = Operand::const_from_scalar(
tcx,
switch_ty,
rustc_const_eval::interpret::Scalar::from_uint(val, size),
rustc_span::DUMMY_SP,
);
let op = if f_b { BinOp::Eq } else { BinOp::Ne };
let rhs = Rvalue::BinaryOp(
op,
Box::new((Operand::Copy(Place::from(discr_local)), const_cmp)),
);
Statement {
source_info: f.source_info,
kind: StatementKind::Assign(Box::new((*lhs, rhs))),
}
}
}
_ => unreachable!(),
}
});
from.statements
.push(Statement { source_info, kind: StatementKind::StorageLive(discr_local) });
from.statements.push(Statement {
source_info,
kind: StatementKind::Assign(Box::new((
Place::from(discr_local),
Rvalue::Use(discr),
))),
});
from.statements.extend(new_stmts);
from.statements
.push(Statement { source_info, kind: StatementKind::StorageDead(discr_local) });
from.terminator_mut().kind = first.terminator().kind.clone();
should_cleanup = true;
}
if should_cleanup {
simplify_cfg(tcx, body);
}
}
}