vmerge.vvm
No synopsis available.
This instruction is defined by:
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V, version >= 0
This instruction is included in the following profiles:
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RVA22S64 (Optional)
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RVA22U64 (Optional)
Decode Variables
Bits<5> vs2 = $encoding[24:20];
Bits<5> vs1 = $encoding[19:15];
Bits<5> vd = $encoding[11:7];
Execution
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IDL
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Sail
{
let start_element = get_start_element();
let end_element = get_end_element();
let SEW = get_sew();
let LMUL_pow = get_lmul_pow();
let num_elem = get_num_elem(LMUL_pow, SEW); /* max(VLMAX,VLEN/SEW)) */
let real_num_elem = if LMUL_pow >= 0 then num_elem else num_elem / (0 - LMUL_pow); /* VLMAX */
if illegal_vd_masked(vd) then { handle_illegal(); return RETIRE_FAIL };
let 'n = num_elem;
let 'm = SEW;
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, 0b00000);
let vs1_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
result : vector('n, dec, bits('m)) = undefined;
let tail_ag : agtype = get_vtype_vta();
foreach (i from 0 to (num_elem - 1)) {
if i < start_element then {
result[i] = vd_val[i]
} else if i > end_element | i >= real_num_elem then {
result[i] = match tail_ag {
UNDISTURBED => vd_val[i],
AGNOSTIC => vd_val[i] /* TODO: configuration support */
}
} else {
/* the merge operates on all body elements */
result[i] = if vm_val[i] then vs1_val[i] else vs2_val[i]
}
};
write_vreg(num_elem, SEW, LMUL_pow, vd, result);
vstart = zeros();
RETIRE_SUCCESS
}