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Auto merge of #124190 - RalfJung:pat-compare-with-fast-path, r=Nadrieril
PatRangeBoundary::compare_with: als add a fast-path for signed integers Not sure if we have a benchmark that hits this... but it seems odd to only do this for unsigned integers.
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@ -1006,15 +1006,18 @@ pub fn compare_with(
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// This code is hot when compiling matches with many ranges. So we
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// special-case extraction of evaluated scalars for speed, for types where
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// unsigned int comparisons are appropriate. E.g. `unicode-normalization` has
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// we can do scalar comparisons. E.g. `unicode-normalization` has
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// many ranges such as '\u{037A}'..='\u{037F}', and chars can be compared
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// in this way.
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(Finite(a), Finite(b)) if matches!(ty.kind(), ty::Uint(_) | ty::Char) => {
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(Finite(a), Finite(b)) if matches!(ty.kind(), ty::Int(_) | ty::Uint(_) | ty::Char) => {
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if let (Some(a), Some(b)) = (a.try_to_scalar_int(), b.try_to_scalar_int()) {
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let sz = ty.primitive_size(tcx);
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let a = a.assert_uint(sz);
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let b = b.assert_uint(sz);
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return Some(a.cmp(&b));
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let cmp = match ty.kind() {
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ty::Uint(_) | ty::Char => a.assert_uint(sz).cmp(&b.assert_uint(sz)),
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ty::Int(_) => a.assert_int(sz).cmp(&b.assert_int(sz)),
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_ => unreachable!(),
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};
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return Some(cmp);
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}
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}
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_ => {}
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