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[codegen] reintroduce support for carry and borrow instructions in RI… (#1005)

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Reintroduce support for iadd carry variants and isub borrow variants for
RISC ISAs which had been removed in
https://github.com/CraneStation/cranelift/pull/961 and
https://github.com/CraneStation/cranelift/pull/962 because of the lack
of a proper flags register in RISC architectures.
This commit is contained in:
Ujjwal Sharma
2019-09-13 20:57:50 +05:30
committed by Benjamin Bouvier
parent cadd0ac655
commit 3418fb6e18
17 changed files with 326 additions and 85 deletions
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4
cranelift/codegen/src/ir/dfg.rs
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@@ -1253,7 +1253,7 @@ mod tests {
assert_eq!(pos.func.dfg.resolve_aliases(v1), v1);
let arg0 = pos.func.dfg.append_ebb_param(ebb0, types::I32);
let (s, c) = pos.ins().iadd_cout(v1, arg0);
let (s, c) = pos.ins().iadd_ifcout(v1, arg0);
let iadd = match pos.func.dfg.value_def(s) {
ValueDef::Result(i, 0) => i,
_ => panic!(),
@@ -1263,7 +1263,7 @@ mod tests {
pos.func.dfg.clear_results(iadd);
pos.func.dfg.attach_result(iadd, s);
// Replace `iadd_cout` with a normal `iadd` and an `ifcmp`.
// Replace `iadd_ifcout` with a normal `iadd` and an `ifcmp`.
pos.func.dfg.replace(iadd).iadd(v1, arg0);
let c2 = pos.ins().ifcmp(s, v1);
pos.func.dfg.change_to_alias(c, c2);