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target/s390x: Use clmul_64 

Use the generic routine for 64-bit carry-less multiply.
Remove our local version of galois_multiply64.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2023-07-11 10:19:45 +01:00
parent 7fcb505455
commit ef73fe7cf1
1 changed files with 12 additions and 46 deletions
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58
target/s390x/tcg/vec_int_helper.c
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@ -21,13 +21,6 @@ static bool s390_vec_is_zero(const S390Vector *v)
return !v->doubleword[0] && !v->doubleword[1];
}
static void s390_vec_xor(S390Vector *res, const S390Vector *a,
const S390Vector *b)
{
res->doubleword[0] = a->doubleword[0] ^ b->doubleword[0];
res->doubleword[1] = a->doubleword[1] ^ b->doubleword[1];
}
static void s390_vec_and(S390Vector *res, const S390Vector *a,
const S390Vector *b)
{
@ -166,26 +159,6 @@ DEF_VCTZ(16)
/* like binary multiplication, but XOR instead of addition */
static S390Vector galois_multiply64(uint64_t a, uint64_t b)
{
S390Vector res = {};
S390Vector va = {
.doubleword[1] = a,
};
S390Vector vb = {
.doubleword[1] = b,
};
while (!s390_vec_is_zero(&vb)) {
if (vb.doubleword[1] & 0x1) {
s390_vec_xor(&res, &res, &va);
}
s390_vec_shl(&va, &va, 1);
s390_vec_shr(&vb, &vb, 1);
}
return res;
}
/*
* There is no carry across the two doublewords, so their order does
* not matter. Nor is there partial overlap between registers.
@ -265,32 +238,25 @@ void HELPER(gvec_vgfma32)(void *v1, const void *v2, const void *v3,
void HELPER(gvec_vgfm64)(void *v1, const void *v2, const void *v3,
uint32_t desc)
{
S390Vector tmp1, tmp2;
uint64_t a, b;
uint64_t *q1 = v1;
const uint64_t *q2 = v2, *q3 = v3;
Int128 r;
a = s390_vec_read_element64(v2, 0);
b = s390_vec_read_element64(v3, 0);
tmp1 = galois_multiply64(a, b);
a = s390_vec_read_element64(v2, 1);
b = s390_vec_read_element64(v3, 1);
tmp2 = galois_multiply64(a, b);
s390_vec_xor(v1, &tmp1, &tmp2);
r = int128_xor(clmul_64(q2[0], q3[0]), clmul_64(q2[1], q3[1]));
q1[0] = int128_gethi(r);
q1[1] = int128_getlo(r);
}
void HELPER(gvec_vgfma64)(void *v1, const void *v2, const void *v3,
const void *v4, uint32_t desc)
{
S390Vector tmp1, tmp2;
uint64_t a, b;
uint64_t *q1 = v1;
const uint64_t *q2 = v2, *q3 = v3, *q4 = v4;
Int128 r;
a = s390_vec_read_element64(v2, 0);
b = s390_vec_read_element64(v3, 0);
tmp1 = galois_multiply64(a, b);
a = s390_vec_read_element64(v2, 1);
b = s390_vec_read_element64(v3, 1);
tmp2 = galois_multiply64(a, b);
s390_vec_xor(&tmp1, &tmp1, &tmp2);
s390_vec_xor(v1, &tmp1, v4);
r = int128_xor(clmul_64(q2[0], q3[0]), clmul_64(q2[1], q3[1]));
q1[0] = q4[0] ^ int128_gethi(r);
q1[1] = q4[1] ^ int128_getlo(r);
}
#define DEF_VMAL(BITS) \