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j immediate decoding fix

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nora 2025-03-10 21:55:18 +01:00
parent 13aec667db
commit 9cdc795824
3 changed files with 59 additions and 10 deletions
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11
src/inst.rs
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@ -394,13 +394,8 @@ impl Display for AmoOp {
}
fn sign_extend(value: u32, size: u32) -> u32 {
assert!(size <= u32::BITS);
let sign = value >> (size - 1);
if sign == 1 {
(u32::MAX << size) | value
} else {
value
}
let right = u32::BITS - size;
(((value << right) as i32) >> right) as u32
}
#[derive(Clone, Copy)]
@ -462,7 +457,7 @@ impl InstCode {
self.immediate_u(&[(12..=31, 12)])
}
fn imm_j(self) -> u32 {
self.immediate_u(&[(31..=31, 20), (21..=30, 1), (20..=20, 11), (12..=19, 12)])
self.immediate_s(&[(31..=31, 20), (21..=30, 1), (20..=20, 11), (12..=19, 12)])
}
}