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/*
* QEMU TCG support -- s390x vector integer instruction support
*
* Copyright (C) 2019 Red Hat Inc
*
* Authors:
* David Hildenbrand <david@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "vec.h"
#include "exec/helper-proto.h"
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_shl(S390Vector *d, const S390Vector *a, uint64_t count)
{
uint64_t tmp;
g_assert(count < 128);
if (count == 0) {
d->doubleword[0] = a->doubleword[0];
d->doubleword[1] = a->doubleword[1];
} else if (count == 64) {
d->doubleword[0] = a->doubleword[1];
d->doubleword[1] = 0;
} else if (count < 64) {
tmp = extract64(a->doubleword[1], 64 - count, count);
d->doubleword[1] = a->doubleword[1] << count;
d->doubleword[0] = (a->doubleword[0] << count) | tmp;
} else {
d->doubleword[0] = a->doubleword[1] << (count - 64);
d->doubleword[1] = 0;
}
}
static void s390_vec_shr(S390Vector *d, const S390Vector *a, uint64_t count)
{
uint64_t tmp;
g_assert(count < 128);
if (count == 0) {
d->doubleword[0] = a->doubleword[0];
d->doubleword[1] = a->doubleword[1];
} else if (count == 64) {
d->doubleword[1] = a->doubleword[0];
d->doubleword[0] = 0;
} else if (count < 64) {
tmp = a->doubleword[1] >> count;
d->doubleword[1] = deposit64(tmp, 64 - count, count, a->doubleword[0]);
d->doubleword[0] = a->doubleword[0] >> count;
} else {
d->doubleword[1] = a->doubleword[0] >> (count - 64);
d->doubleword[0] = 0;
}
}
#define DEF_VAVG(BITS) \
void HELPER(gvec_vavg##BITS)(void *v1, const void *v2, const void *v3, \
uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / BITS); i++) { \
const int32_t a = (int##BITS##_t)s390_vec_read_element##BITS(v2, i); \
const int32_t b = (int##BITS##_t)s390_vec_read_element##BITS(v3, i); \
\
s390_vec_write_element##BITS(v1, i, (a + b + 1) >> 1); \
} \
}
DEF_VAVG(8)
DEF_VAVG(16)
#define DEF_VAVGL(BITS) \
void HELPER(gvec_vavgl##BITS)(void *v1, const void *v2, const void *v3, \
uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / BITS); i++) { \
const uint##BITS##_t a = s390_vec_read_element##BITS(v2, i); \
const uint##BITS##_t b = s390_vec_read_element##BITS(v3, i); \
\
s390_vec_write_element##BITS(v1, i, (a + b + 1) >> 1); \
} \
}
DEF_VAVGL(8)
DEF_VAVGL(16)
#define DEF_VCLZ(BITS) \
void HELPER(gvec_vclz##BITS)(void *v1, const void *v2, uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / BITS); i++) { \
const uint##BITS##_t a = s390_vec_read_element##BITS(v2, i); \
\
s390_vec_write_element##BITS(v1, i, clz32(a) - 32 + BITS); \
} \
}
DEF_VCLZ(8)
DEF_VCLZ(16)
#define DEF_VCTZ(BITS) \
void HELPER(gvec_vctz##BITS)(void *v1, const void *v2, uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / BITS); i++) { \
const uint##BITS##_t a = s390_vec_read_element##BITS(v2, i); \
\
s390_vec_write_element##BITS(v1, i, a ? ctz32(a) : BITS); \
} \
}
DEF_VCTZ(8)
DEF_VCTZ(16)
/* like binary multiplication, but XOR instead of addition */
#define DEF_GALOIS_MULTIPLY(BITS, TBITS) \
static uint##TBITS##_t galois_multiply##BITS(uint##TBITS##_t a, \
uint##TBITS##_t b) \
{ \
uint##TBITS##_t res = 0; \
\
while (b) { \
if (b & 0x1) { \
res = res ^ a; \
} \
a = a << 1; \
b = b >> 1; \
} \
return res; \
}
DEF_GALOIS_MULTIPLY(8, 16)
DEF_GALOIS_MULTIPLY(16, 32)
DEF_GALOIS_MULTIPLY(32, 64)
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;
}
#define DEF_VGFM(BITS, TBITS) \
void HELPER(gvec_vgfm##BITS)(void *v1, const void *v2, const void *v3, \
uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / TBITS); i++) { \
uint##BITS##_t a = s390_vec_read_element##BITS(v2, i * 2); \
uint##BITS##_t b = s390_vec_read_element##BITS(v3, i * 2); \
uint##TBITS##_t d = galois_multiply##BITS(a, b); \
\
a = s390_vec_read_element##BITS(v2, i * 2 + 1); \
b = s390_vec_read_element##BITS(v3, i * 2 + 1); \
d = d ^ galois_multiply32(a, b); \
s390_vec_write_element##TBITS(v1, i, d); \
} \
}
DEF_VGFM(8, 16)
DEF_VGFM(16, 32)
DEF_VGFM(32, 64)
void HELPER(gvec_vgfm64)(void *v1, const void *v2, const void *v3,
uint32_t desc)
{
S390Vector tmp1, tmp2;
uint64_t a, b;
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);
}
#define DEF_VGFMA(BITS, TBITS) \
void HELPER(gvec_vgfma##BITS)(void *v1, const void *v2, const void *v3, \
const void *v4, uint32_t desc) \
{ \
int i; \
\
for (i = 0; i < (128 / TBITS); i++) { \
uint##BITS##_t a = s390_vec_read_element##BITS(v2, i * 2); \
uint##BITS##_t b = s390_vec_read_element##BITS(v3, i * 2); \
uint##TBITS##_t d = galois_multiply##BITS(a, b); \
\
a = s390_vec_read_element##BITS(v2, i * 2 + 1); \
b = s390_vec_read_element##BITS(v3, i * 2 + 1); \
d = d ^ galois_multiply32(a, b); \
d = d ^ s390_vec_read_element##TBITS(v4, i); \
s390_vec_write_element##TBITS(v1, i, d); \
} \
}
DEF_VGFMA(8, 16)
DEF_VGFMA(16, 32)
DEF_VGFMA(32, 64)
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;
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);
}
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