8000 Issue with Vector addition · Issue #397 · riscv/riscv-crypto · GitHub
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Issue with Vector addition #397

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TVS2004Chaitanya opened this issue Feb 28, 2025 · 1 comment
Closed

Issue with Vector addition #397

TVS2004Chaitanya opened this issue Feb 28, 2025 · 1 comment

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@TVS2004Chaitanya
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I am trying to add two vectors of length 8. The following is the C code with inline assembly I am using:

#include <stdio.h>

#define N 8 // Size of vectors

void vector_addition(int *a, int *b, int *c, int n) {
//unsigned long start_cycle, end_cycle, elapsed_cycles;
// asm volatile("csrr %0, cycle" : "=r"(start_cycle));
//for (int i = 0; i < n; i++) {
// c[i] = a[i] + b[i];
// }

asm volatile(
	"vsetvli t0, %[size], e32, m1\n\t"
    "vle32.v v0, (%[x])\n\t"
    "vle32.v v1, (%[y])\n\t"
    "vadd.vv v2, v0, v1\n\t"
    "vse32.v v2, (%[z])\n\t"
    : 
    : [z] "r" (c), [x] "r" (a), [y] "r" (b), [size] "r" (n)
    : "t0", "v0", "v1", "v2", "memory"
);

}

int main() {
int a[N] = {1, 2, 3, 4, 5, 6, 7, 8};
int b[N] = {8, 7, 6, 5, 4, 3, 2, 1};
int c[N];

// Read the initial cycle count
vector_addition(a, b, c, N);



// Output the results
for (int i = 0; i < N; i++) {
    printf("%d ", c[i]);
}
printf("\n");
return 0;

}

The output expected is {9,9,9,9,9,9,9,9}, a vector with 8 9's in it. But the actual output I am getting is {9,9,9,9,0,0,0,}. Why is the output coming like this?
@nibrunieAtSi5
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@TVS2004Chaitanya , how is this related to RISC-V crypto specification ?

it is not clear where you are decrementing you vl (result of vsetvli)) from your AVL (n) and implementing the loop stripmining.

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@nibrunieAtSi5 @TVS2004Chaitanya
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