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s390x/tcg: Implement VECTOR GATHER ELEMENT 

Let's start with a more involved one, but it is the first in the list
of vector support instructions (introduced with the vector facility).

Good thing is, we need a lot of basic infrastructure for this. Reading
and writing vector elements as well as checking element validity.

All vector instruction related translation functions will reside in
translate_vx.inc.c, to be included in translate.c - similar to how
other architectures handle it.

While at it, directly add some documentation (which contains parts about
things added in follow-up patches, but splitting this up does not make
too much sense). Also add ES_* defines heavily used later.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190307121539.12842-5-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-03-07 13:15:11 +01:00 committed by Cornelia Huck
parent 5b5d2090de
commit 6d841663be
3 changed files with 143 additions and 0 deletions
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6
target/s390x/insn-data.def
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@ -972,6 +972,12 @@
D(0xb93e, KIMD, RRE, MSA, 0, 0, 0, 0, msa, 0, S390_FEAT_TYPE_KIMD)
D(0xb93f, KLMD, RRE, MSA, 0, 0, 0, 0, msa, 0, S390_FEAT_TYPE_KLMD)
/* === Vector Support Instructions === */
/* VECTOR GATHER ELEMENT */
E(0xe713, VGEF, VRV, V, la2, 0, 0, 0, vge, 0, ES_32, IF_VEC)
E(0xe712, VGEG, VRV, V, la2, 0, 0, 0, vge, 0, ES_64, IF_VEC)
#ifndef CONFIG_USER_ONLY
/* COMPARE AND SWAP AND PURGE */
E(0xb250, CSP, RRE, Z, r1_32u, ra2, r1_P, 0, csp, 0, MO_TEUL, IF_PRIV)

2
target/s390x/translate.c
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@ -5120,6 +5120,8 @@ static DisasJumpType op_mpcifc(DisasContext *s, DisasOps *o)
}
#endif
#include "translate_vx.inc.c"
/* ====================================================================== */
/* The "Cc OUTput" generators. Given the generated output (and in some cases
the original inputs), update the various cc data structures in order to

135
target/s390x/translate_vx.inc.c Normal file
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@ -0,0 +1,135 @@
/*
* QEMU TCG support -- s390x vector instruction translation functions
*
* 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.
*/
/*
* For most instructions that use the same element size for reads and
* writes, we can use real gvec vector expansion, which potantially uses
* real host vector instructions. As they only work up to 64 bit elements,
* 128 bit elements (vector is a single element) have to be handled
* differently. Operations that are too complicated to encode via TCG ops
* are handled via gvec ool (out-of-line) handlers.
*
* As soon as instructions use different element sizes for reads and writes
* or access elements "out of their element scope" we expand them manually
* in fancy loops, as gvec expansion does not deal with actual element
* numbers and does also not support access to other elements.
*
* 128 bit elements:
* As we only have i32/i64, such elements have to be loaded into two
* i64 values and can then be processed e.g. by tcg_gen_add2_i64.
*
* Sizes:
* On s390x, the operand size (oprsz) and the maximum size (maxsz) are
* always 16 (128 bit). What gvec code calls "vece", s390x calls "es",
* a.k.a. "element size". These values nicely map to MO_8 ... MO_64. Only
* 128 bit element size has to be treated in a special way (MO_64 + 1).
* We will use ES_* instead of MO_* for this reason in this file.
*
* CC handling:
* As gvec ool-helpers can currently not return values (besides via
* pointers like vectors or cpu_env), whenever we have to set the CC and
* can't conclude the value from the result vector, we will directly
* set it in "env->cc_op" and mark it as static via set_cc_static()".
* Whenever this is done, the helper writes globals (cc_op).
*/
#define NUM_VEC_ELEMENT_BYTES(es) (1 << (es))
#define NUM_VEC_ELEMENTS(es) (16 / NUM_VEC_ELEMENT_BYTES(es))
#define ES_8 MO_8
#define ES_16 MO_16
#define ES_32 MO_32
#define ES_64 MO_64
#define ES_128 4
static inline bool valid_vec_element(uint8_t enr, TCGMemOp es)
{
return !(enr & ~(NUM_VEC_ELEMENTS(es) - 1));
}
static void read_vec_element_i64(TCGv_i64 dst, uint8_t reg, uint8_t enr,
TCGMemOp memop)
{
const int offs = vec_reg_offset(reg, enr, memop & MO_SIZE);
switch (memop) {
case ES_8:
tcg_gen_ld8u_i64(dst, cpu_env, offs);
break;
case ES_16:
tcg_gen_ld16u_i64(dst, cpu_env, offs);
break;
case ES_32:
tcg_gen_ld32u_i64(dst, cpu_env, offs);
break;
case ES_8 | MO_SIGN:
tcg_gen_ld8s_i64(dst, cpu_env, offs);
break;
case ES_16 | MO_SIGN:
tcg_gen_ld16s_i64(dst, cpu_env, offs);
break;
case ES_32 | MO_SIGN:
tcg_gen_ld32s_i64(dst, cpu_env, offs);
break;
case ES_64:
case ES_64 | MO_SIGN:
tcg_gen_ld_i64(dst, cpu_env, offs);
break;
default:
g_assert_not_reached();
}
}
static void write_vec_element_i64(TCGv_i64 src, int reg, uint8_t enr,
TCGMemOp memop)
{
const int offs = vec_reg_offset(reg, enr, memop & MO_SIZE);
switch (memop) {
case ES_8:
tcg_gen_st8_i64(src, cpu_env, offs);
break;
case ES_16:
tcg_gen_st16_i64(src, cpu_env, offs);
break;
case ES_32:
tcg_gen_st32_i64(src, cpu_env, offs);
break;
case ES_64:
tcg_gen_st_i64(src, cpu_env, offs);
break;
default:
g_assert_not_reached();
}
}
static DisasJumpType op_vge(DisasContext *s, DisasOps *o)
{
const uint8_t es = s->insn->data;
const uint8_t enr = get_field(s->fields, m3);
TCGv_i64 tmp;
if (!valid_vec_element(enr, es)) {
gen_program_exception(s, PGM_SPECIFICATION);
return DISAS_NORETURN;
}
tmp = tcg_temp_new_i64();
read_vec_element_i64(tmp, get_field(s->fields, v2), enr, es);
tcg_gen_add_i64(o->addr1, o->addr1, tmp);
gen_addi_and_wrap_i64(s, o->addr1, o->addr1, 0);
tcg_gen_qemu_ld_i64(tmp, o->addr1, get_mem_index(s), MO_TE | es);
write_vec_element_i64(tmp, get_field(s->fields, v1), enr, es);
tcg_temp_free_i64(tmp);
return DISAS_NEXT;
}