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Vector: Remove now unnecessary uses of undefined #552

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Sep 20, 2024
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Vector: Remove now unnecessary uses of undefined #552

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4 changes: 3 additions & 1 deletion model/prelude.sail
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,8 @@ val sub_vec_int = pure {c: "sub_bits_int", _: "sub_vec_int"} : forall 'n. (bits(

overload operator - = {sub_vec, sub_vec_int}

val quot_positive_round_zero = pure {interpreter: "quot_round_zero", lem: "hardware_quot", c: "tdiv_int", coq: "Z.quot"} : forall 'n 'm, 'n >= 0 & 'm > 0. (int('n), int('m)) -> int(div('n, 'm))

val quot_round_zero = pure {interpreter: "quot_round_zero", lem: "hardware_quot", c: "tdiv_int", coq: "Z.quot"} : (int, int) -> int
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val rem_round_zero = pure {interpreter: "rem_round_zero", lem: "hardware_mod", c: "tmod_int", coq: "Z.rem"} : (int, int) -> int

Expand Down Expand Up @@ -196,7 +198,7 @@ function reverse_bits_in_byte (xs : bits(8)) -> bits(8) = {

overload reverse = {reverse_bits_in_byte}

overload operator / = {quot_round_zero}
overload operator / = {quot_positive_round_zero, quot_round_zero}
overload operator * = {mult_atom, mult_int}

/* helper for vector extension
Expand Down
152 changes: 61 additions & 91 deletions model/riscv_insts_vext_arith.sail
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82 changes: 33 additions & 49 deletions model/riscv_insts_vext_fp.sail
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Original file line number Diff line number Diff line change
Expand Up @@ -46,10 +46,9 @@ function clause execute(FVVTYPE(funct6, vm, vs2, vs1, vd)) = {
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);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -121,10 +120,9 @@ function clause execute(FVVMATYPE(funct6, vm, vs2, vs1, vd)) = {
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);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -194,10 +192,9 @@ function clause execute(FWVVTYPE(funct6, vm, vs2, vs1, vd)) = {
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
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);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -259,10 +256,9 @@ function clause execute(FWVVMATYPE(funct6, vm, vs1, vs2, vd)) = {
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
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);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -322,10 +318,9 @@ function clause execute(FWVTYPE(funct6, vm, vs2, vs1, vd)) = {
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let vs1_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs1);
let vs2_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vs2);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -379,10 +374,9 @@ function clause execute(VFUNARY0(vm, vs2, vfunary0, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
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);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -498,10 +492,9 @@ function clause execute(VFWUNARY0(vm, vs2, vfwunary0, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -628,10 +621,9 @@ function clause execute(VFNUNARY0(vm, vs2, vfnunary0, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vs2);
let vd_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -759,10 +751,9 @@ function clause execute(VFUNARY1(vm, vs2, vfunary1, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
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);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -884,10 +875,9 @@ function clause execute(FVFTYPE(funct6, vm, vs2, rs1, vd)) = {
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
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);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -974,10 +964,9 @@ function clause execute(FVFMATYPE(funct6, vm, vs2, rs1, vd)) = {
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
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);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -1046,10 +1035,9 @@ function clause execute(FWVFTYPE(funct6, vm, vs2, rs1, vd)) = {
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -1110,10 +1098,9 @@ function clause execute(FWVFMATYPE(funct6, vm, rs1, vs2, vd)) = {
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -1172,10 +1159,9 @@ function clause execute(FWFTYPE(funct6, vm, vs2, rs1, vd)) = {
let vd_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vd);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, dec, bits('o)) = read_vreg(num_elem, SEW_widen, LMUL_pow_widen, vs2);
var result : vector('n, dec, bits('o)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW_widen, LMUL_pow_widen, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -1225,7 +1211,7 @@ function clause execute(VFMERGE(vs2, rs1, vd)) = {
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
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);
var result : vector('n, dec, bits('m)) = undefined;
var result : vector('n, dec, bits('m)) = vector_init(zeros());

let tail_ag : agtype = get_vtype_vta();
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -1272,10 +1258,9 @@ function clause execute(VFMV(rs1, vd)) = {
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, 0b1, 0b00000);
let vd_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then result[i] = rs1_val
Expand Down Expand Up @@ -1309,10 +1294,9 @@ function clause execute(VFMVSF(rs1, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, 0b1, 0b00000);
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vd_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, 0, vd);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, 0, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, 0, vd_val, vm_val);
var result = initial_result;

/* one body element */
if mask[0] then result[0] = rs1_val;
Expand Down
10 changes: 4 additions & 6 deletions model/riscv_insts_vext_fp_vm.sail
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,9 @@ function clause execute(FVVMTYPE(funct6, vm, vs2, vs1, vd)) = {
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, bool) = read_vmask(num_elem, 0b0, vd);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -105,10 +104,9 @@ function clause execute(FVFMTYPE(funct6, vm, vs2, rs1, vd)) = {
let rs1_val : bits('m) = get_scalar_fp(rs1, 'm);
let vs2_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vs2);
let vd_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vd);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down
40 changes: 16 additions & 24 deletions model/riscv_insts_vext_mask.sail
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,9 @@ function clause execute(MMTYPE(funct6, vs2, vs1, vd)) = {
let vs1_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs1);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
let vd_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vd);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_carry(num_elem, SEW, 0, vd_val);
let (initial_result, mask) = init_masked_result_carry(num_elem, SEW, 0, vd_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then {
Expand Down Expand Up @@ -98,10 +97,9 @@ function clause execute(VCPOP_M(vm, vs2, rd)) = {

let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vs2_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vs2_val, vm_val);
var result = initial_result;

var count : nat = 0;
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -134,10 +132,9 @@ function clause execute(VFIRST_M(vm, vs2, rd)) = {

let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vs2_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vs2_val, vm_val);
var result = initial_result;

var index : int = -1;
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -174,10 +171,9 @@ function clause execute(VMSBF_M(vm, vs2, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
let vd_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vd);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vd_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vd_val, vm_val);
var result = initial_result;

var found_elem : bool = false;
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -215,10 +211,9 @@ function clause execute(VMSIF_M(vm, vs2, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
let vd_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vd);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vd_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vd_val, vm_val);
var result = initial_result;

var found_elem : bool = false;
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -256,10 +251,9 @@ function clause execute(VMSOF_M(vm, vs2, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
let vd_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vd);
var result : vector('n, dec, bool) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vd_val, vm_val);
let (initial_result, mask) = init_masked_result_cmp(num_elem, SEW, 0, vd_val, vm_val);
var result = initial_result;

var found_elem : bool = false;
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -301,10 +295,9 @@ function clause execute(VIOTA_M(vm, vs2, vd)) = {
let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vs2_val : vector('n, dec, bool) = read_vmask(num_elem, 0b0, vs2);
let vd_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

var sum : int = 0;
foreach (i from 0 to (num_elem - 1)) {
Expand Down Expand Up @@ -340,10 +333,9 @@ function clause execute(VID_V(vm, vd)) = {

let vm_val : vector('n, dec, bool) = read_vmask(num_elem, vm, 0b00000);
let vd_val : vector('n, dec, bits('m)) = read_vreg(num_elem, SEW, LMUL_pow, vd);
var result : vector('n, dec, bits('m)) = undefined;
var mask : vector('n, dec, bool) = undefined;

(result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
let (initial_result, mask) = init_masked_result(num_elem, SEW, LMUL_pow, vd_val, vm_val);
var result = initial_result;

foreach (i from 0 to (num_elem - 1)) {
if mask[i] then result[i] = to_bits(SEW, i)
Expand Down
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