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Use more helper functions on CursorBase to reduce cursor repositioning.

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This commit is contained in:
Dan Gohman
2017-09-20 11:19:35 -07:00
parent 482439c94b
commit 74845fed6c
6 changed files with 139 additions and 79 deletions
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9
lib/cretonne/src/licm.rs
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@@ -33,14 +33,12 @@ pub fn do_licm(
None => {
let pre_header =
create_pre_header(loop_analysis.loop_header(lp), func, cfg, domtree);
pos = Cursor::new(&mut func.layout);
pos.goto_last_inst(pre_header);
pos = Cursor::new(&mut func.layout).at_last_inst(pre_header);
}
// If there is a natural pre-header we insert new instructions just before the
// related jumping instruction (which is not necessarily at the end).
Some((_, last_inst)) => {
pos = Cursor::new(&mut func.layout);
pos.goto_inst(last_inst);
pos = Cursor::new(&mut func.layout).at_inst(last_inst);
}
};
// The last instruction of the pre-header is the termination instruction (usually
@@ -82,8 +80,7 @@ fn create_pre_header(
}
}
{
let mut pos = Cursor::new(&mut func.layout);
pos.goto_top(header);
let mut pos = Cursor::new(&mut func.layout).at_top(header);
// Inserts the pre-header at the right place in the layout.
pos.insert_ebb(pre_header);
pos.next_inst();