Skip to content

[libc][NFC] Use 16-byte indices for _mmXXX_shuffle_epi8 #77781

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jan 11, 2024
Merged

[libc][NFC] Use 16-byte indices for _mmXXX_shuffle_epi8 #77781

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 7 additions & 7 deletions libc/src/string/memory_utils/op_x86.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -263,13 +263,13 @@ LIBC_INLINE uint64_t big_endian_cmp_mask(__m512i max, __m512i value) {
// 16-byte lane.
// zmm = | 16 bytes | 16 bytes | 16 bytes | 16 bytes |
// zmm = | <8> | <8> | <8> | <8> | <8> | <8> | <8> | <8> |
const __m512i indices = _mm512_set_epi8(56, 57, 58, 59, 60, 61, 62, 63, //
48, 49, 50, 51, 52, 53, 54, 55, //
40, 41, 42, 43, 44, 45, 46, 47, //
32, 33, 34, 35, 36, 37, 38, 39, //
24, 25, 26, 27, 28, 29, 30, 31, //
16, 17, 18, 19, 20, 21, 22, 23, //
8, 9, 10, 11, 12, 13, 14, 15, //
const __m512i indices = _mm512_set_epi8(8, 9, 10, 11, 12, 13, 14, 15, //
0, 1, 2, 3, 4, 5, 6, 7, //
8, 9, 10, 11, 12, 13, 14, 15, //
0, 1, 2, 3, 4, 5, 6, 7, //
8, 9, 10, 11, 12, 13, 14, 15, //
0, 1, 2, 3, 4, 5, 6, 7, //
8, 9, 10, 11, 12, 13, 14, 15, //
0, 1, 2, 3, 4, 5, 6, 7);
// Then we compute the mask for equal bytes. In this mask the bits of each
// byte are already reversed but the byte themselves should be reversed, this
Expand Down