Method insert_block

cranelift/codegen/src/ir/layout.rs:246–266

Insert `block` in the layout before the existing block `before`.

(&mut self, block: Block, before: Block)

    /// Insert `block` in the layout before the existing block `before`.
    pub fn insert_block(&mut self, block: Block, before: Block) {
        debug_assert!(
            !self.is_block_inserted(block),
            "Cannot insert block that is already in the layout"
        );
        debug_assert!(
            self.is_block_inserted(before),
            "block Insertion point not in the layout"
        );
        let after = self.blocks[before].prev;
        {
            let node = &mut self.blocks[block];
            node.next = before.into();
            node.prev = after;
        }
        self.blocks[before].prev = block.into();
        match after.expand() {
            None => self.first_block = Some(block),
            Some(a) => self.blocks[a].next = block.into(),
        }
    }

    /// Insert `block` in the layout *after* the existing block `after`.
    pub fn insert_block_after(&mut self, block: Block, after: Block) {