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Rollup merge of #121706 - Nadrieril:simplify-sort-candidate, r=matthewjasper

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match lowering: Remove hacky branch in sort_candidate

Reusing `self.test()` there wasn't actually pulling a lot of weight. In particular the `TestKind::Len` cases were all already correctly handled.

r? `@matthewjasper`
This commit is contained in:
Matthias Krüger 2024-03-01 22:38:48 +01:00 • committed by GitHub
commit 1fbc53af48
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1 changed files with 17 additions and 34 deletions
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51
compiler/rustc_mir_build/src/build/matches/test.rs
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@ -583,10 +583,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fully_matched = true;
Some(variant_index.as_usize())
}
(&TestKind::Switch { .. }, _) => {
fully_matched = false;
None
}
// If we are performing a switch over integers, then this informs integer
// equality, but nothing else.
@ -611,10 +607,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
options.len()
})
}
(&TestKind::SwitchInt { .. }, _) => {
fully_matched = false;
None
}
(
&TestKind::Len { len: test_len, op: BinOp::Eq },
@ -703,34 +695,25 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
None
}
}
(&TestKind::Range { .. }, _) => {
fully_matched = false;
None
// FIXME(#29623): return `Some(1)` when the values are different.
(TestKind::Eq { value: test_val, .. }, TestCase::Constant { value: case_val })
if test_val == case_val =>
{
fully_matched = true;
Some(0)
}
(&TestKind::Eq { .. } | &TestKind::Len { .. }, _) => {
// The call to `self.test(&match_pair)` below is not actually used to generate any
// MIR. Instead, we just want to compare with `test` (the parameter of the method)
// to see if it is the same.
//
// However, at this point we can still encounter or-patterns that were extracted
// from previous calls to `sort_candidate`, so we need to manually address that
// case to avoid panicking in `self.test()`.
if let TestCase::Or { .. } = &match_pair.test_case {
return None;
}
// These are all binary tests.
//
// FIXME(#29623) we can be more clever here
let pattern_test = self.test(match_pair);
if pattern_test.kind == test.kind {
fully_matched = true;
Some(0)
} else {
fully_matched = false;
None
}
(
TestKind::Switch { .. }
| TestKind::SwitchInt { .. }
| TestKind::Len { .. }
| TestKind::Range { .. }
| TestKind::Eq { .. },
_,
) => {
fully_matched = false;
None
}
};