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Add CursorBase builder methods.

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The CursorBase::at_* are convenience methods for building a cursor that
points to a specific instruction.
This commit is contained in:
Jakob Stoklund Olesen
2017-08-03 18:03:58 -07:00
parent dba0df787c
commit aa0c37235a
2 changed files with 43 additions and 5 deletions
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7
lib/cretonne/src/regalloc/coalescing.rs
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@@ -466,8 +466,7 @@ impl<'a> Context<'a> {
-> Value {
let copy;
{
let mut pos = Cursor::new(&mut self.func.layout);
pos.goto_inst(pred_inst);
let mut pos = Cursor::new(&mut self.func.layout).at_inst(pred_inst);
copy = self.func.dfg.ins(&mut pos).copy(pred_val);
}
let inst = self.func.dfg.value_def(copy).unwrap_inst();
@@ -507,9 +506,7 @@ impl<'a> Context<'a> {
// Insert a copy instruction at the top of ebb.
{
let mut pos = Cursor::new(&mut self.func.layout);
pos.goto_top(ebb);
pos.next_inst();
let mut pos = Cursor::new(&mut self.func.layout).at_first_inst(ebb);
self.func
.dfg
.ins(&mut pos)