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Merge pull request #3234 from dheaton-arm/implement-isubb

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Implement `IsubBin`, `IsubBout`, and `IsubBorrow`for Cranelift interpreter
This commit is contained in:
Chris Fallin
2021-09-01 11:25:43 -07:00
committed by GitHub
parent 2a63979151 d1fe72affa
commit 91410aaddf
4 changed files with 254 additions and 3 deletions
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23
cranelift/interpreter/src/step.rs
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@@ -550,11 +550,28 @@ where
assign_multiple(&[sum, Value::bool(carry, types::B1)?])
}
Opcode::IaddIfcarry => unimplemented!("IaddIfcarry"),
Opcode::IsubBin => unimplemented!("IsubBin"),
Opcode::IsubBin => choose(
Value::into_bool(arg(2)?)?,
Value::sub(arg(0)?, Value::add(arg(1)?, Value::int(1, ctrl_ty)?)?)?,
Value::sub(arg(0)?, arg(1)?)?,
),
Opcode::IsubIfbin => unimplemented!("IsubIfbin"),
Opcode::IsubBout => unimplemented!("IsubBout"),
Opcode::IsubBout => {
let sum = Value::sub(arg(0)?, arg(1)?)?;
let borrow = Value::lt(&arg(0)?, &arg(1)?)?;
assign_multiple(&[sum, Value::bool(borrow, types::B1)?])
}
Opcode::IsubIfbout => unimplemented!("IsubIfbout"),
Opcode::IsubBorrow => unimplemented!("IsubBorrow"),
Opcode::IsubBorrow => {
let rhs = if Value::into_bool(arg(2)?)? {
Value::add(arg(1)?, Value::int(1, ctrl_ty)?)?
} else {
arg(1)?
};
let borrow = Value::lt(&arg(0)?, &rhs)?;
let sum = Value::sub(arg(0)?, rhs)?;
assign_multiple(&[sum, Value::bool(borrow, types::B1)?])
}
Opcode::IsubIfborrow => unimplemented!("IsubIfborrow"),
Opcode::Band => binary(Value::and, arg(0)?, arg(1)?)?,
Opcode::Bor => binary(Value::or, arg(0)?, arg(1)?)?,