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adler32_rvv: Fix two overflow problems #1826

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Merged
merged 1 commit into from
Dec 21, 2024
Merged

adler32_rvv: Fix two overflow problems #1826

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10 changes: 7 additions & 3 deletions arch/riscv/adler32_rvv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,7 @@ static inline uint32_t adler32_rvv_impl(uint32_t adler, uint8_t* restrict dst, c
/* do modulo once each block of NMAX size */
if (++cnt >= nmax_limit) {
v_adler32_prev_accu = __riscv_vremu_vx_u32m4(v_adler32_prev_accu, BASE, vl);
v_buf32_accu = __riscv_vremu_vx_u32m4(v_buf32_accu, BASE, vl);
cnt = 0;
}
}
Expand Down Expand Up @@ -99,16 +100,19 @@ static inline uint32_t adler32_rvv_impl(uint32_t adler, uint8_t* restrict dst, c

vuint32m1_t v_sum2_sum = __riscv_vmv_s_x_u32m1(0, vl);
v_sum2_sum = __riscv_vredsum_vs_u32m4_u32m1(v_sum32_accu, v_sum2_sum, vl);
uint32_t sum2_sum = __riscv_vmv_x_s_u32m1_u32(v_sum2_sum);
uint32_t sum2_sum = __riscv_vmv_x_s_u32m1_u32(v_sum2_sum) % BASE;

sum2 += (sum2_sum + adler * (len - left));
sum2 += (sum2_sum + adler * ((len - left) % BASE));

vuint32m1_t v_adler_sum = __riscv_vmv_s_x_u32m1(0, vl);
v_adler_sum = __riscv_vredsum_vs_u32m4_u32m1(v_buf32_accu, v_adler_sum, vl);
uint32_t adler_sum = __riscv_vmv_x_s_u32m1_u32(v_adler_sum);
uint32_t adler_sum = __riscv_vmv_x_s_u32m1_u32(v_adler_sum) % BASE;

adler += adler_sum;

sum2 %= BASE;
adler %= BASE;

while (left--) {
if (COPY) *dst++ = *src;
adler += *src++;
Expand Down
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