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8ecb477ea1
Remove memset-reg.h by moving register definitions into the memset implementations. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
164 lines
3.4 KiB
ArmAsm
164 lines
3.4 KiB
ArmAsm
/* Generic optimized memset using SIMD.
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Copyright (C) 2012-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifndef MEMSET
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# define MEMSET memset
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#endif
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/* Assumptions:
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*
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* ARMv8-a, AArch64, Advanced SIMD, unaligned accesses.
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*
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*/
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#define dstin x0
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#define valw w1
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#define count x2
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#define dst x3
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#define dstend x4
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#define zva_val x5
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#define off x3
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#define dstend2 x5
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ENTRY (MEMSET)
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PTR_ARG (0)
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SIZE_ARG (2)
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dup v0.16B, valw
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cmp count, 16
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b.lo L(set_small)
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add dstend, dstin, count
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cmp count, 64
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b.hs L(set_128)
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/* Set 16..63 bytes. */
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mov off, 16
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and off, off, count, lsr 1
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sub dstend2, dstend, off
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str q0, [dstin]
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str q0, [dstin, off]
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str q0, [dstend2, -16]
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str q0, [dstend, -16]
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ret
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.p2align 4
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/* Set 0..15 bytes. */
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L(set_small):
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add dstend, dstin, count
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cmp count, 4
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b.lo 2f
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lsr off, count, 3
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sub dstend2, dstend, off, lsl 2
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str s0, [dstin]
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str s0, [dstin, off, lsl 2]
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str s0, [dstend2, -4]
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str s0, [dstend, -4]
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ret
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/* Set 0..3 bytes. */
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2: cbz count, 3f
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lsr off, count, 1
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strb valw, [dstin]
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strb valw, [dstin, off]
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strb valw, [dstend, -1]
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3: ret
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.p2align 4
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L(set_128):
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bic dst, dstin, 15
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cmp count, 128
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b.hi L(set_long)
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stp q0, q0, [dstin]
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stp q0, q0, [dstin, 32]
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stp q0, q0, [dstend, -64]
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stp q0, q0, [dstend, -32]
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ret
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.p2align 4
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L(set_long):
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str q0, [dstin]
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str q0, [dst, 16]
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tst valw, 255
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b.ne L(no_zva)
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#ifndef ZVA64_ONLY
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mrs zva_val, dczid_el0
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and zva_val, zva_val, 31
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cmp zva_val, 4 /* ZVA size is 64 bytes. */
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b.ne L(zva_128)
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#endif
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stp q0, q0, [dst, 32]
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bic dst, dstin, 63
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sub count, dstend, dst /* Count is now 64 too large. */
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sub count, count, 64 + 64 /* Adjust count and bias for loop. */
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/* Write last bytes before ZVA loop. */
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stp q0, q0, [dstend, -64]
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stp q0, q0, [dstend, -32]
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.p2align 4
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L(zva64_loop):
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add dst, dst, 64
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dc zva, dst
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subs count, count, 64
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b.hi L(zva64_loop)
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ret
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.p2align 3
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L(no_zva):
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sub count, dstend, dst /* Count is 32 too large. */
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sub count, count, 64 + 32 /* Adjust count and bias for loop. */
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L(no_zva_loop):
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stp q0, q0, [dst, 32]
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stp q0, q0, [dst, 64]
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add dst, dst, 64
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subs count, count, 64
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b.hi L(no_zva_loop)
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stp q0, q0, [dstend, -64]
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stp q0, q0, [dstend, -32]
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ret
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#ifndef ZVA64_ONLY
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.p2align 4
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L(zva_128):
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cmp zva_val, 5 /* ZVA size is 128 bytes. */
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b.ne L(no_zva)
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stp q0, q0, [dst, 32]
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stp q0, q0, [dst, 64]
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stp q0, q0, [dst, 96]
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bic dst, dst, 127
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sub count, dstend, dst /* Count is now 128 too large. */
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sub count, count, 128 + 128 /* Adjust count and bias for loop. */
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1: add dst, dst, 128
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dc zva, dst
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subs count, count, 128
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b.hi 1b
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stp q0, q0, [dstend, -128]
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stp q0, q0, [dstend, -96]
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stp q0, q0, [dstend, -64]
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stp q0, q0, [dstend, -32]
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ret
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#endif
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END (MEMSET)
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libc_hidden_builtin_def (MEMSET)
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