diff options
Diffstat (limited to 'sysdeps/aarch64/multiarch/memset_kunpeng.S')
| -rw-r--r-- | sysdeps/aarch64/multiarch/memset_kunpeng.S | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/sysdeps/aarch64/multiarch/memset_kunpeng.S b/sysdeps/aarch64/multiarch/memset_kunpeng.S new file mode 100644 index 0000000000..a03441ae72 --- /dev/null +++ b/sysdeps/aarch64/multiarch/memset_kunpeng.S @@ -0,0 +1,113 @@ +/* Optimized memset for Huawei Kunpeng processor. + Copyright (C) 2012-2019 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <sysdeps/aarch64/memset-reg.h> + +#if IS_IN (libc) +# define MEMSET __memset_kunpeng + +/* Assumptions: + * + * ARMv8-a, AArch64, unaligned accesses + * + */ + +ENTRY_ALIGN (MEMSET, 6) + + DELOUSE (0) + DELOUSE (2) + + dup v0.16B, valw + add dstend, dstin, count + + cmp count, 128 + b.hs L(set_long) + + cmp count, 16 + b.lo L(less16) + + /* Set 16..127 bytes. */ + str q0, [dstin] + tbnz count, 6, L(set127) + str q0, [dstend, -16] + tbz count, 5, 1f + str q0, [dstin, 16] + str q0, [dstend, -32] +1: ret + + .p2align 4 + /* Set 64..127 bytes. Write 64 bytes from the start and + 64 bytes from the end. */ +L(set127): + stp q0, q0, [dstin, 16] + str q0, [dstin, 48] + stp q0, q0, [dstend, -64] + stp q0, q0, [dstend, -32] + ret + + .p2align 4 + /* Set 0..15 bytes. */ +L(less16): + tbz count, 3, L(less8) + str d0, [dstin] + str d0, [dstend, -8] + ret +L(less8): + tbz count, 2, 2f + str s0, [dstin] + str s0, [dstend, -4] + ret +2: cbz count, 3f + str b0, [dstin] + tbz count, 1, 3f + str h0, [dstend, -2] +3: ret + + .p2align 4 +L(set_long): + bic dst, dstin, 15 + str q0, [dstin] + sub count, dstend, dst /* Count is 16 too large. */ + sub dst, dst, 16 /* Dst is biased by -32. */ + sub count, count, 64 + 16 + 1 /* Adjust count and bias for loop. */ +1: stp q0, q0, [dst, 32] + stp q0, q0, [dst, 64]! + subs count, count, 64 + b.lo 1f + stp q0, q0, [dst, 32] + stp q0, q0, [dst, 64]! + subs count, count, 64 + b.lo 1f + stp q0, q0, [dst, 32] + stp q0, q0, [dst, 64]! + subs count, count, 64 + b.lo 1f + stp q0, q0, [dst, 32] + stp q0, q0, [dst, 64]! + subs count, count, 64 + b.hs 1b + +1: stp q0, q0, [dstend, -64] + stp q0, q0, [dstend, -32] + ret + +END (MEMSET) +libc_hidden_builtin_def (MEMSET) +#endif |