https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63530
Carrot <carrot at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |carrot at google dot com
--- Comment #1 from Carrot <carrot at google dot com> ---
The problem is in 116t.vect pass.
...
67 vector(16) unsigned char * vectp_b.15;
68 <var_decl 0x7f1361c15e10 vectp_b.15
69 type <pointer_type 0x7f1361b56e70 type <vector_type 0x7f1361b56540>
70 unsigned SI
71 size <integer_cst 0x7f1361c0beb8 constant 32>
72 unit size <integer_cst 0x7f1361c0bed0 constant 4>
73 align 32 symtab 0 alias set -1 canonical type 0x7f1361b56e70>
74 used unsigned ignored SI file t3.c line 8 col 8
75 size <integer_cst 0x7f1361c0beb8 constant 32>
76 unit size <integer_cst 0x7f1361c0bed0 constant 4>
77 align 32 context <function_decl 0x7f1361b40300 foo>>
78 vector(16) unsigned char * vectp_b.14;
79 <var_decl 0x7f1361c15d80 vectp_b.14
80 type <pointer_type 0x7f1361b56e70 type <vector_type 0x7f1361b56540>
81 unsigned SI
82 size <integer_cst 0x7f1361c0beb8 constant 32>
83 unit size <integer_cst 0x7f1361c0bed0 constant 4>
84 align 32 symtab 0 alias set -1 canonical type 0x7f1361b56e70>
85 used unsigned ignored SI file t3.c line 8 col 8
86 size <integer_cst 0x7f1361c0beb8 constant 32>
87 unit size <integer_cst 0x7f1361c0bed0 constant 4>
88 align 32 context <function_decl 0x7f1361b40300 foo>>
...
100 vector(16) unsigned char vect__7.12;
101 <var_decl 0x7f1361c15c60 vect__7.12
102 type <vector_type 0x7f1361b56540 type <integer_type
0x7f1361c0f3f0 unsigned char>
103 unsigned V16QI
104 size <integer_cst 0x7f1361c1d270 constant 128>
105 unit size <integer_cst 0x7f1361c1d288 constant 16>
106 align 64 symtab 0 alias set 0 canonical type
0x7f1361b56540 nunits 16
107 pointer_to_this <pointer_type 0x7f1361b56e70>>
108 used unsigned ignored V16QI file t3.c line 8 col 8
109 size <integer_cst 0x7f1361c1d270 constant 128>
110 unit size <integer_cst 0x7f1361c1d288 constant 16>
111 align 64 context <function_decl 0x7f1361b40300 foo>>
...
223 unsigned char _7;
224 unsigned int _11;
225 unsigned int _15;
226 unsigned int _16;
227 unsigned char _20;
228 unsigned int _23;
229 unsigned int _24;
230 int _32;
231 sizetype _48;
232 unsigned int ivtmp_56;
233 unsigned int ivtmp_57;
234
235 <bb 2>:
236 b_5 = calloc (1, 260);
237 if (n_6(D) <= 255)
238 goto <bb 4>;
239 else
240 goto <bb 3>;
241
242 <bb 3>:
243 return b_5;
244
245 <bb 4>:
246 _11 = (unsigned int) n_6(D);
247 niters.3_2 = 256 - _11;
248 _15 = niters.3_2 + 4294967280;
249 _16 = _15 >> 4;
250 bnd.4_10 = _16 + 1;
251 ratio_mult_vf.5_17 = bnd.4_10 << 4;
252 _23 = (unsigned int) n_6(D);
253 _24 = 255 - _23;
254 if (_24 <= 14)
255 goto <bb 10>;
256 else
257 goto <bb 5>;
258
259 <bb 5>:
260 stmp_var_.7_33 = n_6(D) + 1;
261 stmp_var_.7_34 = stmp_var_.7_33 + 1;
262 stmp_var_.7_35 = stmp_var_.7_34 + 1;
263 vect_cst_.8_36 = {n_6(D), stmp_var_.7_33, stmp_var_.7_34,
stmp_var_.7_35};
264 vect_cst_.9_37 = { 16, 16, 16, 16 };
265 vect_cst_.11_40 = { 4, 4, 4, 4 };
266 _48 = (sizetype) n_6(D);
267 vectp_b.15_47 = b_5 + _48;
268 vect_cst_.17_8 = { 1, 1, 1, 1 };
269
270 <bb 6>:
271 # n_12 = PHI <n_6(D)(5), n_9(13)>
272 # vect_vec_iv_.10_38 = PHI <vect_cst_.8_36(5), vect_vec_iv_.10_39(13)>
273 # vectp_b.14_49 = PHI <vectp_b.15_47(5), vectp_b.14_50(13)>
274 # ivtmp_56 = PHI <0(5), ivtmp_57(13)>
275 vect_vec_iv_.10_39 = vect_vec_iv_.10_38 + vect_cst_.9_37;
276 vect_vec_iv_.10_41 = vect_vec_iv_.10_38 + vect_cst_.11_40;
277 vect_vec_iv_.10_42 = vect_vec_iv_.10_41 + vect_cst_.11_40;
278 vect_vec_iv_.10_43 = vect_vec_iv_.10_42 + vect_cst_.11_40;
279 vect__7.13_44 = VEC_PACK_TRUNC_EXPR <vect_vec_iv_.10_38,
vect_vec_iv_.10_41>;
280 vect__7.13_45 = VEC_PACK_TRUNC_EXPR <vect_vec_iv_.10_42,
vect_vec_iv_.10_43>;
281 vect__7.12_46 = VEC_PACK_TRUNC_EXPR <vect__7.13_44, vect__7.13_45>;
282 _7 = (unsigned char) n_12;
283 MEM[(unsigned char[256] *)vectp_b.14_49] = vect__7.12_46;
284 vect_n_9.16_52 = vect_vec_iv_.10_38 + vect_cst_.17_8;
285 vect_n_9.16_53 = vect_vec_iv_.10_41 + vect_cst_.17_8;
286 vect_n_9.16_54 = vect_vec_iv_.10_42 + vect_cst_.17_8;
287 vect_n_9.16_55 = vect_vec_iv_.10_43 + vect_cst_.17_8;
288 n_9 = n_12 + 1;
289 vectp_b.14_50 = vectp_b.14_49 + 16;
290 ivtmp_57 = ivtmp_56 + 1;
291 if (ivtmp_57 < bnd.4_10)
292 goto <bb 13>;
293 else
294 goto <bb 9>;
295
296 <bb 7>:
297 # n_18 = PHI <n_22(8), n_25(10)>
298 _20 = (unsigned char) n_18;
299 b_5->map[n_18] = _20;
300 n_22 = n_18 + 1;
301 if (n_22 <= 255)
302 goto <bb 8>;
303 else
304 goto <bb 11>;
305
306 <bb 8>:
307 goto <bb 7>;
308
309 <bb 9>:
310 # n_26 = PHI <n_9(6)>
311 _32 = (int) ratio_mult_vf.5_17;
312 tmp.6_31 = n_6(D) + _32;
313 if (niters.3_2 == ratio_mult_vf.5_17)
314 goto <bb 12>;
315 else
316 goto <bb 10>;
317
318 <bb 10>:
319 # n_25 = PHI <tmp.6_31(9), n_6(D)(4)>
320 goto <bb 7>;
321
322 <bb 11>:
323
324 <bb 12>:
325 goto <bb 3>;
326
327 <bb 13>:
328 goto <bb 6>;
329
330 }
vectp_b is assigned a value a line 267,
267 vectp_b.15_47 = b_5 + _48;
_48 is a passed in parameter, so the pointer value of vectp_b should be
unaligned.
But the declaration of vectp_b is a pointer to type <vector_type
0x7f1361b56540>, that is 64bit aligned at line 106.
So the backend generates a 64bit aligned memory access instruction accordingly.
