http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51387
Michael Zolotukhin <michael.v.zolotukhin at gmail dot com> changed:
What |Removed |Added
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CC| |michael.v.zolotukhin at
| |gmail dot com
--- Comment #1 from Michael Zolotukhin <michael.v.zolotukhin at gmail dot com>
2011-12-02 05:53:25 UTC ---
I added prints to the test and saw that the result was incorrectly permuted
(bytes 8-15 and 16-23 should be swapped):
i C[i] correct C[i]
0 0 0
1 1 1
2 4 4
3 9 9
4 16 16
5 25 25
6 36 36
7 49 49
8 0 64
9 33 81
10 68 100
11 105 121
12 144 144
13 185 169
14 228 196
15 17 225
16 64 0
17 81 33
18 100 68
19 121 105
20 144 144
21 169 185
22 196 228
23 225 17
24 64 64
25 113 113
26 164 164
27 217 217
28 16 16
29 73 73
30 132 132
31 193 193
Looks like there is a problem in function
expand_vec_perm_vpshufb2_vpermq_even_odd (config/i386/i386.c) in this code:
/* Permute the V4DImode quarters using { 0, 2, 1, 3 } permutation. */
op = gen_lowpart (V4DImode, d->target);
ior = gen_lowpart (V4DImode, ior);
emit_insn (gen_avx2_permv4di_1 (op, ior, const0_rtx, const2_rtx,
const1_rtx, GEN_INT (3)));
What do we need this permute for?
