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Implement SLLI and fix sign extension of immediates for I-type and S-type instructions

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taitep
2025-12-21 14:00:47 +01:00
parent 87e6d03dbd
commit d03863f5a2
3 changed files with 24 additions and 4 deletions
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8
src/decode.rs
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@@ -52,12 +52,12 @@ impl Instruction {
#[inline]
pub fn imm_i(self) -> DWord {
(self.0 as i64 >> 20) as DWord
(self.0 as i32 as i64 >> 20) as DWord
}
#[inline]
pub fn imm_s(self) -> DWord {
(self.0 as i64 >> (25 - 5) & (0x7f << 5)) as DWord | (self.0 >> 7 & 0b1111) as DWord
(self.0 as i32 as i64 >> (25 - 5) & (0x7f << 5)) as DWord | (self.0 >> 7 & 0b1111) as DWord
}
#[inline]
@@ -88,12 +88,12 @@ impl Instruction {
// The following are AFAIK only used for shift by immediate operations
#[inline]
fn funct6(self) -> u8 {
pub fn funct6(self) -> u8 {
(self.0 >> 26 & 0x3f) as u8
}
#[inline]
fn imm_shamt(self) -> usize {
pub fn imm_shamt(self) -> usize {
(self.0 >> 20 & 0x3f) as usize
}
}