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Use branchless way to get rv_hi/rv_lo result #146

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Merged
merged 1 commit into from
Aug 5, 2024
Merged

Use branchless way to get rv_hi/rv_lo result #146

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8 changes: 2 additions & 6 deletions src/riscv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -112,16 +112,12 @@ int rv_extract_bits(int imm, int i_start, int i_end, int d_start, int d_end)

int rv_hi(int val)
{
if ((val & (1 << 11)) != 0)
return val + 4096;
return val;
return val + ((val & (1 << 11)) << 1);
}

int rv_lo(int val)
{
if ((val & (1 << 11)) != 0)
return (val & 0xFFF) - 4096;
return val & 0xFFF;
return (val & 0xFFF) - ((val & (1 << 11)) << 1);
}

int rv_encode_R(rv_op op, rv_reg rd, rv_reg rs1, rv_reg rs2)
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