xref: /openbmc/qemu/target/arm/tcg/translate-sme.c (revision 2e1cacfb)
1 /*
2  * AArch64 SME translation
3  *
4  * Copyright (c) 2022 Linaro, Ltd
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "qemu/osdep.h"
21 #include "translate.h"
22 #include "translate-a64.h"
23 
24 /*
25  * Include the generated decoder.
26  */
27 
28 #include "decode-sme.c.inc"
29 
30 
31 /*
32  * Resolve tile.size[index] to a host pointer, where tile and index
33  * are always decoded together, dependent on the element size.
34  */
35 static TCGv_ptr get_tile_rowcol(DisasContext *s, int esz, int rs,
36                                 int tile_index, bool vertical)
37 {
38     int tile = tile_index >> (4 - esz);
39     int index = esz == MO_128 ? 0 : extract32(tile_index, 0, 4 - esz);
40     int pos, len, offset;
41     TCGv_i32 tmp;
42     TCGv_ptr addr;
43 
44     /* Compute the final index, which is Rs+imm. */
45     tmp = tcg_temp_new_i32();
46     tcg_gen_trunc_tl_i32(tmp, cpu_reg(s, rs));
47     tcg_gen_addi_i32(tmp, tmp, index);
48 
49     /* Prepare a power-of-two modulo via extraction of @len bits. */
50     len = ctz32(streaming_vec_reg_size(s)) - esz;
51 
52     if (!len) {
53         /*
54          * SVL is 128 and the element size is 128. There is exactly
55          * one 128x128 tile in the ZA storage, and so we calculate
56          * (Rs + imm) MOD 1, which is always 0. We need to special case
57          * this because TCG doesn't allow deposit ops with len 0.
58          */
59         tcg_gen_movi_i32(tmp, 0);
60     } else if (vertical) {
61         /*
62          * Compute the byte offset of the index within the tile:
63          *     (index % (svl / size)) * size
64          *   = (index % (svl >> esz)) << esz
65          * Perform the power-of-two modulo via extraction of the low @len bits.
66          * Perform the multiply by shifting left by @pos bits.
67          * Perform these operations simultaneously via deposit into zero.
68          */
69         pos = esz;
70         tcg_gen_deposit_z_i32(tmp, tmp, pos, len);
71 
72         /*
73          * For big-endian, adjust the indexed column byte offset within
74          * the uint64_t host words that make up env->zarray[].
75          */
76         if (HOST_BIG_ENDIAN && esz < MO_64) {
77             tcg_gen_xori_i32(tmp, tmp, 8 - (1 << esz));
78         }
79     } else {
80         /*
81          * Compute the byte offset of the index within the tile:
82          *     (index % (svl / size)) * (size * sizeof(row))
83          *   = (index % (svl >> esz)) << (esz + log2(sizeof(row)))
84          */
85         pos = esz + ctz32(sizeof(ARMVectorReg));
86         tcg_gen_deposit_z_i32(tmp, tmp, pos, len);
87 
88         /* Row slices are always aligned and need no endian adjustment. */
89     }
90 
91     /* The tile byte offset within env->zarray is the row. */
92     offset = tile * sizeof(ARMVectorReg);
93 
94     /* Include the byte offset of zarray to make this relative to env. */
95     offset += offsetof(CPUARMState, zarray);
96     tcg_gen_addi_i32(tmp, tmp, offset);
97 
98     /* Add the byte offset to env to produce the final pointer. */
99     addr = tcg_temp_new_ptr();
100     tcg_gen_ext_i32_ptr(addr, tmp);
101     tcg_gen_add_ptr(addr, addr, tcg_env);
102 
103     return addr;
104 }
105 
106 /*
107  * Resolve tile.size[0] to a host pointer.
108  * Used by e.g. outer product insns where we require the entire tile.
109  */
110 static TCGv_ptr get_tile(DisasContext *s, int esz, int tile)
111 {
112     TCGv_ptr addr = tcg_temp_new_ptr();
113     int offset;
114 
115     offset = tile * sizeof(ARMVectorReg) + offsetof(CPUARMState, zarray);
116 
117     tcg_gen_addi_ptr(addr, tcg_env, offset);
118     return addr;
119 }
120 
121 static bool trans_ZERO(DisasContext *s, arg_ZERO *a)
122 {
123     if (!dc_isar_feature(aa64_sme, s)) {
124         return false;
125     }
126     if (sme_za_enabled_check(s)) {
127         gen_helper_sme_zero(tcg_env, tcg_constant_i32(a->imm),
128                             tcg_constant_i32(streaming_vec_reg_size(s)));
129     }
130     return true;
131 }
132 
133 static bool trans_MOVA(DisasContext *s, arg_MOVA *a)
134 {
135     static gen_helper_gvec_4 * const h_fns[5] = {
136         gen_helper_sve_sel_zpzz_b, gen_helper_sve_sel_zpzz_h,
137         gen_helper_sve_sel_zpzz_s, gen_helper_sve_sel_zpzz_d,
138         gen_helper_sve_sel_zpzz_q
139     };
140     static gen_helper_gvec_3 * const cz_fns[5] = {
141         gen_helper_sme_mova_cz_b, gen_helper_sme_mova_cz_h,
142         gen_helper_sme_mova_cz_s, gen_helper_sme_mova_cz_d,
143         gen_helper_sme_mova_cz_q,
144     };
145     static gen_helper_gvec_3 * const zc_fns[5] = {
146         gen_helper_sme_mova_zc_b, gen_helper_sme_mova_zc_h,
147         gen_helper_sme_mova_zc_s, gen_helper_sme_mova_zc_d,
148         gen_helper_sme_mova_zc_q,
149     };
150 
151     TCGv_ptr t_za, t_zr, t_pg;
152     TCGv_i32 t_desc;
153     int svl;
154 
155     if (!dc_isar_feature(aa64_sme, s)) {
156         return false;
157     }
158     if (!sme_smza_enabled_check(s)) {
159         return true;
160     }
161 
162     t_za = get_tile_rowcol(s, a->esz, a->rs, a->za_imm, a->v);
163     t_zr = vec_full_reg_ptr(s, a->zr);
164     t_pg = pred_full_reg_ptr(s, a->pg);
165 
166     svl = streaming_vec_reg_size(s);
167     t_desc = tcg_constant_i32(simd_desc(svl, svl, 0));
168 
169     if (a->v) {
170         /* Vertical slice -- use sme mova helpers. */
171         if (a->to_vec) {
172             zc_fns[a->esz](t_zr, t_za, t_pg, t_desc);
173         } else {
174             cz_fns[a->esz](t_za, t_zr, t_pg, t_desc);
175         }
176     } else {
177         /* Horizontal slice -- reuse sve sel helpers. */
178         if (a->to_vec) {
179             h_fns[a->esz](t_zr, t_za, t_zr, t_pg, t_desc);
180         } else {
181             h_fns[a->esz](t_za, t_zr, t_za, t_pg, t_desc);
182         }
183     }
184     return true;
185 }
186 
187 static bool trans_LDST1(DisasContext *s, arg_LDST1 *a)
188 {
189     typedef void GenLdSt1(TCGv_env, TCGv_ptr, TCGv_ptr, TCGv, TCGv_i32);
190 
191     /*
192      * Indexed by [esz][be][v][mte][st], which is (except for load/store)
193      * also the order in which the elements appear in the function names,
194      * and so how we must concatenate the pieces.
195      */
196 
197 #define FN_LS(F)     { gen_helper_sme_ld1##F, gen_helper_sme_st1##F }
198 #define FN_MTE(F)    { FN_LS(F), FN_LS(F##_mte) }
199 #define FN_HV(F)     { FN_MTE(F##_h), FN_MTE(F##_v) }
200 #define FN_END(L, B) { FN_HV(L), FN_HV(B) }
201 
202     static GenLdSt1 * const fns[5][2][2][2][2] = {
203         FN_END(b, b),
204         FN_END(h_le, h_be),
205         FN_END(s_le, s_be),
206         FN_END(d_le, d_be),
207         FN_END(q_le, q_be),
208     };
209 
210 #undef FN_LS
211 #undef FN_MTE
212 #undef FN_HV
213 #undef FN_END
214 
215     TCGv_ptr t_za, t_pg;
216     TCGv_i64 addr;
217     uint32_t desc;
218     bool be = s->be_data == MO_BE;
219     bool mte = s->mte_active[0];
220 
221     if (!dc_isar_feature(aa64_sme, s)) {
222         return false;
223     }
224     if (!sme_smza_enabled_check(s)) {
225         return true;
226     }
227 
228     t_za = get_tile_rowcol(s, a->esz, a->rs, a->za_imm, a->v);
229     t_pg = pred_full_reg_ptr(s, a->pg);
230     addr = tcg_temp_new_i64();
231 
232     tcg_gen_shli_i64(addr, cpu_reg(s, a->rm), a->esz);
233     tcg_gen_add_i64(addr, addr, cpu_reg_sp(s, a->rn));
234 
235     if (!mte) {
236         addr = clean_data_tbi(s, addr);
237     }
238 
239     desc = make_svemte_desc(s, streaming_vec_reg_size(s), 1, a->esz, a->st, 0);
240 
241     fns[a->esz][be][a->v][mte][a->st](tcg_env, t_za, t_pg, addr,
242                                       tcg_constant_i32(desc));
243     return true;
244 }
245 
246 typedef void GenLdStR(DisasContext *, TCGv_ptr, int, int, int, int);
247 
248 static bool do_ldst_r(DisasContext *s, arg_ldstr *a, GenLdStR *fn)
249 {
250     int svl = streaming_vec_reg_size(s);
251     int imm = a->imm;
252     TCGv_ptr base;
253 
254     if (!sme_za_enabled_check(s)) {
255         return true;
256     }
257 
258     /* ZA[n] equates to ZA0H.B[n]. */
259     base = get_tile_rowcol(s, MO_8, a->rv, imm, false);
260 
261     fn(s, base, 0, svl, a->rn, imm * svl);
262     return true;
263 }
264 
265 TRANS_FEAT(LDR, aa64_sme, do_ldst_r, a, gen_sve_ldr)
266 TRANS_FEAT(STR, aa64_sme, do_ldst_r, a, gen_sve_str)
267 
268 static bool do_adda(DisasContext *s, arg_adda *a, MemOp esz,
269                     gen_helper_gvec_4 *fn)
270 {
271     int svl = streaming_vec_reg_size(s);
272     uint32_t desc = simd_desc(svl, svl, 0);
273     TCGv_ptr za, zn, pn, pm;
274 
275     if (!sme_smza_enabled_check(s)) {
276         return true;
277     }
278 
279     za = get_tile(s, esz, a->zad);
280     zn = vec_full_reg_ptr(s, a->zn);
281     pn = pred_full_reg_ptr(s, a->pn);
282     pm = pred_full_reg_ptr(s, a->pm);
283 
284     fn(za, zn, pn, pm, tcg_constant_i32(desc));
285     return true;
286 }
287 
288 TRANS_FEAT(ADDHA_s, aa64_sme, do_adda, a, MO_32, gen_helper_sme_addha_s)
289 TRANS_FEAT(ADDVA_s, aa64_sme, do_adda, a, MO_32, gen_helper_sme_addva_s)
290 TRANS_FEAT(ADDHA_d, aa64_sme_i16i64, do_adda, a, MO_64, gen_helper_sme_addha_d)
291 TRANS_FEAT(ADDVA_d, aa64_sme_i16i64, do_adda, a, MO_64, gen_helper_sme_addva_d)
292 
293 static bool do_outprod(DisasContext *s, arg_op *a, MemOp esz,
294                        gen_helper_gvec_5 *fn)
295 {
296     int svl = streaming_vec_reg_size(s);
297     uint32_t desc = simd_desc(svl, svl, a->sub);
298     TCGv_ptr za, zn, zm, pn, pm;
299 
300     if (!sme_smza_enabled_check(s)) {
301         return true;
302     }
303 
304     za = get_tile(s, esz, a->zad);
305     zn = vec_full_reg_ptr(s, a->zn);
306     zm = vec_full_reg_ptr(s, a->zm);
307     pn = pred_full_reg_ptr(s, a->pn);
308     pm = pred_full_reg_ptr(s, a->pm);
309 
310     fn(za, zn, zm, pn, pm, tcg_constant_i32(desc));
311     return true;
312 }
313 
314 static bool do_outprod_fpst(DisasContext *s, arg_op *a, MemOp esz,
315                             ARMFPStatusFlavour e_fpst,
316                             gen_helper_gvec_5_ptr *fn)
317 {
318     int svl = streaming_vec_reg_size(s);
319     uint32_t desc = simd_desc(svl, svl, a->sub);
320     TCGv_ptr za, zn, zm, pn, pm, fpst;
321 
322     if (!sme_smza_enabled_check(s)) {
323         return true;
324     }
325 
326     za = get_tile(s, esz, a->zad);
327     zn = vec_full_reg_ptr(s, a->zn);
328     zm = vec_full_reg_ptr(s, a->zm);
329     pn = pred_full_reg_ptr(s, a->pn);
330     pm = pred_full_reg_ptr(s, a->pm);
331     fpst = fpstatus_ptr(e_fpst);
332 
333     fn(za, zn, zm, pn, pm, fpst, tcg_constant_i32(desc));
334     return true;
335 }
336 
337 static bool do_outprod_env(DisasContext *s, arg_op *a, MemOp esz,
338                            gen_helper_gvec_5_ptr *fn)
339 {
340     int svl = streaming_vec_reg_size(s);
341     uint32_t desc = simd_desc(svl, svl, a->sub);
342     TCGv_ptr za, zn, zm, pn, pm;
343 
344     if (!sme_smza_enabled_check(s)) {
345         return true;
346     }
347 
348     za = get_tile(s, esz, a->zad);
349     zn = vec_full_reg_ptr(s, a->zn);
350     zm = vec_full_reg_ptr(s, a->zm);
351     pn = pred_full_reg_ptr(s, a->pn);
352     pm = pred_full_reg_ptr(s, a->pm);
353 
354     fn(za, zn, zm, pn, pm, tcg_env, tcg_constant_i32(desc));
355     return true;
356 }
357 
358 TRANS_FEAT(FMOPA_h, aa64_sme, do_outprod_env, a,
359            MO_32, gen_helper_sme_fmopa_h)
360 TRANS_FEAT(FMOPA_s, aa64_sme, do_outprod_fpst, a,
361            MO_32, FPST_FPCR, gen_helper_sme_fmopa_s)
362 TRANS_FEAT(FMOPA_d, aa64_sme_f64f64, do_outprod_fpst, a,
363            MO_64, FPST_FPCR, gen_helper_sme_fmopa_d)
364 
365 TRANS_FEAT(BFMOPA, aa64_sme, do_outprod_env, a, MO_32, gen_helper_sme_bfmopa)
366 
367 TRANS_FEAT(SMOPA_s, aa64_sme, do_outprod, a, MO_32, gen_helper_sme_smopa_s)
368 TRANS_FEAT(UMOPA_s, aa64_sme, do_outprod, a, MO_32, gen_helper_sme_umopa_s)
369 TRANS_FEAT(SUMOPA_s, aa64_sme, do_outprod, a, MO_32, gen_helper_sme_sumopa_s)
370 TRANS_FEAT(USMOPA_s, aa64_sme, do_outprod, a, MO_32, gen_helper_sme_usmopa_s)
371 
372 TRANS_FEAT(SMOPA_d, aa64_sme_i16i64, do_outprod, a, MO_64, gen_helper_sme_smopa_d)
373 TRANS_FEAT(UMOPA_d, aa64_sme_i16i64, do_outprod, a, MO_64, gen_helper_sme_umopa_d)
374 TRANS_FEAT(SUMOPA_d, aa64_sme_i16i64, do_outprod, a, MO_64, gen_helper_sme_sumopa_d)
375 TRANS_FEAT(USMOPA_d, aa64_sme_i16i64, do_outprod, a, MO_64, gen_helper_sme_usmopa_d)
376