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Create bottom on-the-fly instead of cloning it.

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This commit is contained in:
Camille GILLOT 2023-05-06 11:08:36 +00:00
parent 9c97abd54c
commit 760881b29d
1 changed files with 4 additions and 3 deletions
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7
compiler/rustc_mir_dataflow/src/framework/engine.rs
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@ -201,11 +201,12 @@ where
analysis: A, analysis: A,
apply_trans_for_block: Option<Box<dyn Fn(BasicBlock, &mut A::Domain)>>, apply_trans_for_block: Option<Box<dyn Fn(BasicBlock, &mut A::Domain)>>,
) -> Self { ) -> Self {
let bottom_value = analysis.bottom_value(body); let mut entry_sets =
let mut entry_sets = IndexVec::from_elem(bottom_value.clone(), &body.basic_blocks); IndexVec::from_fn_n(|_| analysis.bottom_value(body), body.basic_blocks.len());
analysis.initialize_start_block(body, &mut entry_sets[mir::START_BLOCK]); analysis.initialize_start_block(body, &mut entry_sets[mir::START_BLOCK]);
if A::Direction::IS_BACKWARD && entry_sets[mir::START_BLOCK] != bottom_value { if A::Direction::IS_BACKWARD && entry_sets[mir::START_BLOCK] != analysis.bottom_value(body)
{
bug!("`initialize_start_block` is not yet supported for backward dataflow analyses"); bug!("`initialize_start_block` is not yet supported for backward dataflow analyses");
} }