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target/riscv: vmfirst find-first-set mask bit

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Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200701152549.1218-52-zhiwei_liu@c-sky.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
LIU Zhiwei 2020-07-01 23:25:39 +08:00 • committed by Alistair Francis
parent 2e88f551df
commit 0db67e1c0c
4 changed files with 54 additions and 0 deletions
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19
target/riscv/vector_helper.c
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@ -4562,3 +4562,22 @@ target_ulong HELPER(vmpopc_m)(void *v0, void *vs2, CPURISCVState *env,
}
return cnt;
}
/* vmfirst find-first-set mask bit*/
target_ulong HELPER(vmfirst_m)(void *v0, void *vs2, CPURISCVState *env,
uint32_t desc)
{
uint32_t mlen = vext_mlen(desc);
uint32_t vm = vext_vm(desc);
uint32_t vl = env->vl;
int i;
for (i = 0; i < vl; i++) {
if (vm || vext_elem_mask(v0, mlen, i)) {
if (vext_elem_mask(vs2, mlen, i)) {
return i;
}
}
}
return -1LL;
}