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Emit the enum range assumption if the range only contains one element

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test: add test case

make tidy happy
This commit is contained in:
hi-rustin 2021-03-11 23:30:39 +08:00
parent 5c6d3bf389
commit d180f91824
2 changed files with 17 additions and 1 deletions
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2
compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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@ -325,7 +325,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let er = scalar.valid_range_exclusive(bx.cx());
if er.end != er.start
&& scalar.valid_range.end() > scalar.valid_range.start()
&& scalar.valid_range.end() >= scalar.valid_range.start()
{
// We want `table[e as usize ± k]` to not
// have bound checks, and this is the most