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Skip intermediate PtrAdds. #1468

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Skip intermediate PtrAdds. #1468

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39 changes: 39 additions & 0 deletions ykrt/src/compile/jitc_yk/opt/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -326,6 +326,21 @@ impl Opt {
Operand::Var(op_iidx) => {
if x.off() == 0 {
self.m.replace(iidx, Inst::Copy(op_iidx));
} else {
// Skip intermediate `PtrAdds`. For example given:
// %7: ptr = ptr_add %0, 2
// %8: ptr = ptr_add %7, 3
// we can replace the latter with:
// %8: ptr = ptr_add %0, 5
if let Some(Inst::PtrAdd(back_inst)) = self.m.inst_nocopy(op_iidx) {
self.m.replace(
iidx,
Inst::PtrAdd(PtrAddInst::new(
back_inst.ptr(&self.m),
back_inst.off().checked_add(x.off()).unwrap(),
)),
);
}
}
}
},
Expand Down Expand Up @@ -1022,4 +1037,28 @@ mod test {
",
);
}

#[test]
fn opt_ptr_adds() {
Module::assert_ir_transform_eq(
"
entry:
%0: ptr = load_ti 0
%1: ptr = ptr_add %0, 2
%2: ptr = ptr_add %1, 3
black_box %1
black_box %2
",
|m| opt(m).unwrap(),
"
...
entry:
%0: ptr = load_ti ...
%1: ptr = ptr_add %0, 2
%2: ptr = ptr_add %0, 5
black_box %1
black_box %2
",
);
}
}