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Add comments for CompareType

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DianQK 2024-03-10 22:07:41 +08:00
parent 254289a16e
commit 032bb742ab
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1 changed files with 11 additions and 8 deletions
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19
compiler/rustc_mir_transform/src/match_branches.rs
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@ -269,9 +269,12 @@ struct SimplifyToExp {
#[derive(Clone, Copy)] #[derive(Clone, Copy)]
enum CompareType<'tcx, 'a> { enum CompareType<'tcx, 'a> {
/// Identical statements.
Same(&'a StatementKind<'tcx>), Same(&'a StatementKind<'tcx>),
/// Assignment statements have the same value.
Eq(&'a Place<'tcx>, Ty<'tcx>, ScalarInt), Eq(&'a Place<'tcx>, Ty<'tcx>, ScalarInt),
Discr(&'a Place<'tcx>, Ty<'tcx>, bool), /// Enum variant comparison type.
Discr { place: &'a Place<'tcx>, ty: Ty<'tcx>, is_signed: bool },
} }
enum TransfromType { enum TransfromType {
@ -285,7 +288,7 @@ impl From<CompareType<'_, '_>> for TransfromType {
match compare_type { match compare_type {
CompareType::Same(_) => TransfromType::Same, CompareType::Same(_) => TransfromType::Same,
CompareType::Eq(_, _, _) => TransfromType::Eq, CompareType::Eq(_, _, _) => TransfromType::Eq,
CompareType::Discr(_, _, _) => TransfromType::Discr, CompareType::Discr { .. } => TransfromType::Discr,
} }
} }
} }
@ -402,11 +405,11 @@ impl<'tcx> SimplifyMatch<'tcx> for SimplifyToExp {
&& Some(s) && Some(s)
== ScalarInt::try_from_uint(second_val, s.size())) => == ScalarInt::try_from_uint(second_val, s.size())) =>
{ {
CompareType::Discr( CompareType::Discr {
lhs_f, place: lhs_f,
f_c.const_.ty(), ty: f_c.const_.ty(),
f_c.const_.ty().is_signed() || discr_ty.is_signed(), is_signed: f_c.const_.ty().is_signed() || discr_ty.is_signed(),
) }
} }
_ => { _ => {
return false; return false;
@ -436,7 +439,7 @@ impl<'tcx> SimplifyMatch<'tcx> for SimplifyToExp {
&& s_c.const_.ty() == f_ty && s_c.const_.ty() == f_ty
&& s_c.const_.try_eval_scalar_int(tcx, param_env) == Some(val) => {} && s_c.const_.try_eval_scalar_int(tcx, param_env) == Some(val) => {}
( (
CompareType::Discr(lhs_f, f_ty, is_signed), CompareType::Discr { place: lhs_f, ty: f_ty, is_signed },
StatementKind::Assign(box (lhs_s, Rvalue::Use(Operand::Constant(s_c)))), StatementKind::Assign(box (lhs_s, Rvalue::Use(Operand::Constant(s_c)))),
) if lhs_f == lhs_s && s_c.const_.ty() == f_ty => { ) if lhs_f == lhs_s && s_c.const_.ty() == f_ty => {
let Some(f) = s_c.const_.try_eval_scalar_int(tcx, param_env) else { let Some(f) = s_c.const_.try_eval_scalar_int(tcx, param_env) else {