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xemu/target/s390x/vec_string_helper.c
David Hildenbrand 13b0228f77 s390x/tcg: Implement VECTOR STRING RANGE COMPARE 
Unfortunately, there is no easy way to avoid looping over all elements
in v2. Provide specialized variants for !cc,!rt/!cc,rt/cc,!rt/cc,rt and
all element types. Especially for different values of rt, the compiler
might be able to optimize the code a lot.

Add s390_vec_write_element().

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
2019-06-07 14:53:25 +02:00

474 lines
17 KiB
C
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/*
* QEMU TCG support -- s390x vector string 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 "internal.h"
#include "vec.h"
#include "tcg/tcg.h"
#include "tcg/tcg-gvec-desc.h"
#include "exec/helper-proto.h"
/*
* Returns a bit set in the MSB of each element that is zero,
* as defined by the mask.
*/
static inline uint64_t zero_search(uint64_t a, uint64_t mask)
{
return ~(((a & mask) + mask) | a | mask);
}
/*
* Returns a bit set in the MSB of each element that is not zero,
* as defined by the mask.
*/
static inline uint64_t nonzero_search(uint64_t a, uint64_t mask)
{
return (((a & mask) + mask) | a) & ~mask;
}
/*
* Returns the byte offset for the first match, or 16 for no match.
*/
static inline int match_index(uint64_t c0, uint64_t c1)
{
return (c0 ? clz64(c0) : clz64(c1) + 64) >> 3;
}
/*
* Returns the number of bits composing one element.
*/
static uint8_t get_element_bits(uint8_t es)
{
return (1 << es) * BITS_PER_BYTE;
}
/*
* Returns the bitmask for a single element.
*/
static uint64_t get_single_element_mask(uint8_t es)
{
return -1ull >> (64 - get_element_bits(es));
}
/*
* Returns the bitmask for a single element (excluding the MSB).
*/
static uint64_t get_single_element_lsbs_mask(uint8_t es)
{
return -1ull >> (65 - get_element_bits(es));
}
/*
* Returns the bitmasks for multiple elements (excluding the MSBs).
*/
static uint64_t get_element_lsbs_mask(uint8_t es)
{
return dup_const(es, get_single_element_lsbs_mask(es));
}
static int vfae(void *v1, const void *v2, const void *v3, bool in,
bool rt, bool zs, uint8_t es)
{
const uint64_t mask = get_element_lsbs_mask(es);
const int bits = get_element_bits(es);
uint64_t a0, a1, b0, b1, e0, e1, t0, t1, z0, z1;
uint64_t first_zero = 16;
uint64_t first_equal;
int i;
a0 = s390_vec_read_element64(v2, 0);
a1 = s390_vec_read_element64(v2, 1);
b0 = s390_vec_read_element64(v3, 0);
b1 = s390_vec_read_element64(v3, 1);
e0 = 0;
e1 = 0;
/* compare against equality with every other element */
for (i = 0; i < 64; i += bits) {
t0 = rol64(b0, i);
t1 = rol64(b1, i);
e0 |= zero_search(a0 ^ t0, mask);
e0 |= zero_search(a0 ^ t1, mask);
e1 |= zero_search(a1 ^ t0, mask);
e1 |= zero_search(a1 ^ t1, mask);
}
/* invert the result if requested - invert only the MSBs */
if (in) {
e0 = ~e0 & ~mask;
e1 = ~e1 & ~mask;
}
first_equal = match_index(e0, e1);
if (zs) {
z0 = zero_search(a0, mask);
z1 = zero_search(a1, mask);
first_zero = match_index(z0, z1);
}
if (rt) {
e0 = (e0 >> (bits - 1)) * get_single_element_mask(es);
e1 = (e1 >> (bits - 1)) * get_single_element_mask(es);
s390_vec_write_element64(v1, 0, e0);
s390_vec_write_element64(v1, 1, e1);
} else {
s390_vec_write_element64(v1, 0, MIN(first_equal, first_zero));
s390_vec_write_element64(v1, 1, 0);
}
if (first_zero == 16 && first_equal == 16) {
return 3; /* no match */
} else if (first_zero == 16) {
return 1; /* matching elements, no match for zero */
} else if (first_equal < first_zero) {
return 2; /* matching elements before match for zero */
}
return 0; /* match for zero */
}
#define DEF_VFAE_HELPER(BITS) \
void HELPER(gvec_vfae##BITS)(void *v1, const void *v2, const void *v3, \
uint32_t desc) \
{ \
const bool in = extract32(simd_data(desc), 3, 1); \
const bool rt = extract32(simd_data(desc), 2, 1); \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
vfae(v1, v2, v3, in, rt, zs, MO_##BITS); \
}
DEF_VFAE_HELPER(8)
DEF_VFAE_HELPER(16)
DEF_VFAE_HELPER(32)
#define DEF_VFAE_CC_HELPER(BITS) \
void HELPER(gvec_vfae_cc##BITS)(void *v1, const void *v2, const void *v3, \
CPUS390XState *env, uint32_t desc) \
{ \
const bool in = extract32(simd_data(desc), 3, 1); \
const bool rt = extract32(simd_data(desc), 2, 1); \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
env->cc_op = vfae(v1, v2, v3, in, rt, zs, MO_##BITS); \
}
DEF_VFAE_CC_HELPER(8)
DEF_VFAE_CC_HELPER(16)
DEF_VFAE_CC_HELPER(32)
static int vfee(void *v1, const void *v2, const void *v3, bool zs, uint8_t es)
{
const uint64_t mask = get_element_lsbs_mask(es);
uint64_t a0, a1, b0, b1, e0, e1, z0, z1;
uint64_t first_zero = 16;
uint64_t first_equal;
a0 = s390_vec_read_element64(v2, 0);
a1 = s390_vec_read_element64(v2, 1);
b0 = s390_vec_read_element64(v3, 0);
b1 = s390_vec_read_element64(v3, 1);
e0 = zero_search(a0 ^ b0, mask);
e1 = zero_search(a1 ^ b1, mask);
first_equal = match_index(e0, e1);
if (zs) {
z0 = zero_search(a0, mask);
z1 = zero_search(a1, mask);
first_zero = match_index(z0, z1);
}
s390_vec_write_element64(v1, 0, MIN(first_equal, first_zero));
s390_vec_write_element64(v1, 1, 0);
if (first_zero == 16 && first_equal == 16) {
return 3; /* no match */
} else if (first_zero == 16) {
return 1; /* matching elements, no match for zero */
} else if (first_equal < first_zero) {
return 2; /* matching elements before match for zero */
}
return 0; /* match for zero */
}
#define DEF_VFEE_HELPER(BITS) \
void HELPER(gvec_vfee##BITS)(void *v1, const void *v2, const void *v3, \
uint32_t desc) \
{ \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
vfee(v1, v2, v3, zs, MO_##BITS); \
}
DEF_VFEE_HELPER(8)
DEF_VFEE_HELPER(16)
DEF_VFEE_HELPER(32)
#define DEF_VFEE_CC_HELPER(BITS) \
void HELPER(gvec_vfee_cc##BITS)(void *v1, const void *v2, const void *v3, \
CPUS390XState *env, uint32_t desc) \
{ \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
env->cc_op = vfee(v1, v2, v3, zs, MO_##BITS); \
}
DEF_VFEE_CC_HELPER(8)
DEF_VFEE_CC_HELPER(16)
DEF_VFEE_CC_HELPER(32)
static int vfene(void *v1, const void *v2, const void *v3, bool zs, uint8_t es)
{
const uint64_t mask = get_element_lsbs_mask(es);
uint64_t a0, a1, b0, b1, e0, e1, z0, z1;
uint64_t first_zero = 16;
uint64_t first_inequal;
bool smaller = false;
a0 = s390_vec_read_element64(v2, 0);
a1 = s390_vec_read_element64(v2, 1);
b0 = s390_vec_read_element64(v3, 0);
b1 = s390_vec_read_element64(v3, 1);
e0 = nonzero_search(a0 ^ b0, mask);
e1 = nonzero_search(a1 ^ b1, mask);
first_inequal = match_index(e0, e1);
/* identify the smaller element */
if (first_inequal < 16) {
uint8_t enr = first_inequal / (1 << es);
uint32_t a = s390_vec_read_element(v2, enr, es);
uint32_t b = s390_vec_read_element(v3, enr, es);
smaller = a < b;
}
if (zs) {
z0 = zero_search(a0, mask);
z1 = zero_search(a1, mask);
first_zero = match_index(z0, z1);
}
s390_vec_write_element64(v1, 0, MIN(first_inequal, first_zero));
s390_vec_write_element64(v1, 1, 0);
if (first_zero == 16 && first_inequal == 16) {
return 3;
} else if (first_zero < first_inequal) {
return 0;
}
return smaller ? 1 : 2;
}
#define DEF_VFENE_HELPER(BITS) \
void HELPER(gvec_vfene##BITS)(void *v1, const void *v2, const void *v3, \
uint32_t desc) \
{ \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
vfene(v1, v2, v3, zs, MO_##BITS); \
}
DEF_VFENE_HELPER(8)
DEF_VFENE_HELPER(16)
DEF_VFENE_HELPER(32)
#define DEF_VFENE_CC_HELPER(BITS) \
void HELPER(gvec_vfene_cc##BITS)(void *v1, const void *v2, const void *v3, \
CPUS390XState *env, uint32_t desc) \
{ \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
env->cc_op = vfene(v1, v2, v3, zs, MO_##BITS); \
}
DEF_VFENE_CC_HELPER(8)
DEF_VFENE_CC_HELPER(16)
DEF_VFENE_CC_HELPER(32)
static int vistr(void *v1, const void *v2, uint8_t es)
{
const uint64_t mask = get_element_lsbs_mask(es);
uint64_t a0 = s390_vec_read_element64(v2, 0);
uint64_t a1 = s390_vec_read_element64(v2, 1);
uint64_t z;
int cc = 3;
z = zero_search(a0, mask);
if (z) {
a0 &= ~(-1ull >> clz64(z));
a1 = 0;
cc = 0;
} else {
z = zero_search(a1, mask);
if (z) {
a1 &= ~(-1ull >> clz64(z));
cc = 0;
}
}
s390_vec_write_element64(v1, 0, a0);
s390_vec_write_element64(v1, 1, a1);
return cc;
}
#define DEF_VISTR_HELPER(BITS) \
void HELPER(gvec_vistr##BITS)(void *v1, const void *v2, uint32_t desc) \
{ \
vistr(v1, v2, MO_##BITS); \
}
DEF_VISTR_HELPER(8)
DEF_VISTR_HELPER(16)
DEF_VISTR_HELPER(32)
#define DEF_VISTR_CC_HELPER(BITS) \
void HELPER(gvec_vistr_cc##BITS)(void *v1, const void *v2, CPUS390XState *env, \
uint32_t desc) \
{ \
env->cc_op = vistr(v1, v2, MO_##BITS); \
}
DEF_VISTR_CC_HELPER(8)
DEF_VISTR_CC_HELPER(16)
DEF_VISTR_CC_HELPER(32)
static bool element_compare(uint32_t data, uint32_t l, uint8_t c)
{
const bool equal = extract32(c, 7, 1);
const bool lower = extract32(c, 6, 1);
const bool higher = extract32(c, 5, 1);
if (data < l) {
return lower;
} else if (data > l) {
return higher;
}
return equal;
}
static int vstrc(void *v1, const void *v2, const void *v3, const void *v4,
bool in, bool rt, bool zs, uint8_t es)
{
const uint64_t mask = get_element_lsbs_mask(es);
uint64_t a0 = s390_vec_read_element64(v2, 0);
uint64_t a1 = s390_vec_read_element64(v2, 1);
int first_zero = 16, first_match = 16;
S390Vector rt_result = {};
uint64_t z0, z1;
int i, j;
if (zs) {
z0 = zero_search(a0, mask);
z1 = zero_search(a1, mask);
first_zero = match_index(z0, z1);
}
for (i = 0; i < 16 / (1 << es); i++) {
const uint32_t data = s390_vec_read_element(v2, i, es);
const int cur_byte = i * (1 << es);
bool any_match = false;
/* if we don't need a bit vector, we can stop early */
if (cur_byte == first_zero && !rt) {
break;
}
for (j = 0; j < 16 / (1 << es); j += 2) {
const uint32_t l1 = s390_vec_read_element(v3, j, es);
const uint32_t l2 = s390_vec_read_element(v3, j + 1, es);
/* we are only interested in the highest byte of each element */
const uint8_t c1 = s390_vec_read_element8(v4, j * (1 << es));
const uint8_t c2 = s390_vec_read_element8(v4, (j + 1) * (1 << es));
if (element_compare(data, l1, c1) &&
element_compare(data, l2, c2)) {
any_match = true;
break;
}
}
/* invert the result if requested */
any_match = in ^ any_match;
if (any_match) {
/* indicate bit vector if requested */
if (rt) {
const uint64_t val = -1ull;
first_match = MIN(cur_byte, first_match);
s390_vec_write_element(&rt_result, i, es, val);
} else {
/* stop on the first match */
first_match = cur_byte;
break;
}
}
}
if (rt) {
*(S390Vector *)v1 = rt_result;
} else {
s390_vec_write_element64(v1, 0, MIN(first_match, first_zero));
s390_vec_write_element64(v1, 1, 0);
}
if (first_zero == 16 && first_match == 16) {
return 3; /* no match */
} else if (first_zero == 16) {
return 1; /* matching elements, no match for zero */
} else if (first_match < first_zero) {
return 2; /* matching elements before match for zero */
}
return 0; /* match for zero */
}
#define DEF_VSTRC_HELPER(BITS) \
void HELPER(gvec_vstrc##BITS)(void *v1, const void *v2, const void *v3, \
const void *v4, uint32_t desc) \
{ \
const bool in = extract32(simd_data(desc), 3, 1); \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
vstrc(v1, v2, v3, v4, in, 0, zs, MO_##BITS); \
}
DEF_VSTRC_HELPER(8)
DEF_VSTRC_HELPER(16)
DEF_VSTRC_HELPER(32)
#define DEF_VSTRC_RT_HELPER(BITS) \
void HELPER(gvec_vstrc_rt##BITS)(void *v1, const void *v2, const void *v3, \
const void *v4, uint32_t desc) \
{ \
const bool in = extract32(simd_data(desc), 3, 1); \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
vstrc(v1, v2, v3, v4, in, 1, zs, MO_##BITS); \
}
DEF_VSTRC_RT_HELPER(8)
DEF_VSTRC_RT_HELPER(16)
DEF_VSTRC_RT_HELPER(32)
#define DEF_VSTRC_CC_HELPER(BITS) \
void HELPER(gvec_vstrc_cc##BITS)(void *v1, const void *v2, const void *v3, \
const void *v4, CPUS390XState *env, \
uint32_t desc) \
{ \
const bool in = extract32(simd_data(desc), 3, 1); \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
env->cc_op = vstrc(v1, v2, v3, v4, in, 0, zs, MO_##BITS); \
}
DEF_VSTRC_CC_HELPER(8)
DEF_VSTRC_CC_HELPER(16)
DEF_VSTRC_CC_HELPER(32)
#define DEF_VSTRC_CC_RT_HELPER(BITS) \
void HELPER(gvec_vstrc_cc_rt##BITS)(void *v1, const void *v2, const void *v3, \
const void *v4, CPUS390XState *env, \
uint32_t desc) \
{ \
const bool in = extract32(simd_data(desc), 3, 1); \
const bool zs = extract32(simd_data(desc), 1, 1); \
\
env->cc_op = vstrc(v1, v2, v3, v4, in, 1, zs, MO_##BITS); \
}
DEF_VSTRC_CC_RT_HELPER(8)
DEF_VSTRC_CC_RT_HELPER(16)
DEF_VSTRC_CC_RT_HELPER(32)
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