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Implement slt in interpreter

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This commit is contained in:
Robin Salen 2023-04-06 16:58:21 -04:00
parent 232832e34d
commit ac2ccc1eb9
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GPG Key ID: FB87BACFB3CB2007
1 changed files with 8 additions and 8 deletions
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16
evm/src/cpu/kernel/interpreter.rs
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@ -318,7 +318,7 @@ impl<'a> Interpreter<'a> {
0x0e => self.run_subfp254(), // "SUBFP254",
0x10 => self.run_lt(), // "LT",
0x11 => self.run_gt(), // "GT",
0x12 => todo!(), // "SLT",
0x12 => self.run_slt(), // "SLT",
0x13 => todo!(), // "SGT",
0x14 => self.run_eq(), // "EQ",
0x15 => self.run_iszero(), // "ISZERO",
@ -577,6 +577,12 @@ impl<'a> Interpreter<'a> {
self.push_bool(x > y);
}
fn run_slt(&mut self) {
let x = self.pop();
let y = self.pop();
self.push_bool(signed_cmp(x, y) == Ordering::Less);
}
fn run_eq(&mut self) {
let x = self.pop();
let y = self.pop();
@ -942,13 +948,7 @@ fn signed_cmp(x: U256, y: U256) -> Ordering {
}
}
const MINUS_ZERO: U256 = U256([
0x0000000000000001,
0x0000000000000000,
0x0000000000000000,
0x8000000000000000,
]);
/// -1 in two's complement representation consists in all bits set to 1.
const MINUS_ONE: U256 = U256([
0xffffffffffffffff,
0xffffffffffffffff,