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Diffstat (limited to 'sysdeps/riscv/memcpy_noalignment.S')
| -rw-r--r-- | sysdeps/riscv/memcpy_noalignment.S | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/sysdeps/riscv/memcpy_noalignment.S b/sysdeps/riscv/memcpy_noalignment.S deleted file mode 100644 index 621f8d028f..0000000000 --- a/sysdeps/riscv/memcpy_noalignment.S +++ /dev/null @@ -1,136 +0,0 @@ -/* memcpy for RISC-V, ignoring buffer alignment - Copyright (C) 2024 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 <sys/asm.h> - -/* void *memcpy(void *, const void *, size_t) */ -ENTRY (__memcpy_noalignment) - move t6, a0 /* Preserve return value */ - - /* Bail if 0 */ - beqz a2, 7f - - /* Jump to byte copy if size < SZREG */ - li a4, SZREG - bltu a2, a4, 5f - - /* Round down to the nearest "page" size */ - andi a4, a2, ~((16*SZREG)-1) - beqz a4, 2f - add a3, a1, a4 - - /* Copy the first word to get dest word aligned */ - andi a5, t6, SZREG-1 - beqz a5, 1f - REG_L a6, (a1) - REG_S a6, (t6) - - /* Align dst up to a word, move src and size as well. */ - addi t6, t6, SZREG-1 - andi t6, t6, ~(SZREG-1) - sub a5, t6, a0 - add a1, a1, a5 - sub a2, a2, a5 - - /* Recompute page count */ - andi a4, a2, ~((16*SZREG)-1) - beqz a4, 2f - -1: - /* Copy "pages" (chunks of 16 registers) */ - REG_L a4, 0(a1) - REG_L a5, SZREG(a1) - REG_L a6, 2*SZREG(a1) - REG_L a7, 3*SZREG(a1) - REG_L t0, 4*SZREG(a1) - REG_L t1, 5*SZREG(a1) - REG_L t2, 6*SZREG(a1) - REG_L t3, 7*SZREG(a1) - REG_L t4, 8*SZREG(a1) - REG_L t5, 9*SZREG(a1) - REG_S a4, 0(t6) - REG_S a5, SZREG(t6) - REG_S a6, 2*SZREG(t6) - REG_S a7, 3*SZREG(t6) - REG_S t0, 4*SZREG(t6) - REG_S t1, 5*SZREG(t6) - REG_S t2, 6*SZREG(t6) - REG_S t3, 7*SZREG(t6) - REG_S t4, 8*SZREG(t6) - REG_S t5, 9*SZREG(t6) - REG_L a4, 10*SZREG(a1) - REG_L a5, 11*SZREG(a1) - REG_L a6, 12*SZREG(a1) - REG_L a7, 13*SZREG(a1) - REG_L t0, 14*SZREG(a1) - REG_L t1, 15*SZREG(a1) - addi a1, a1, 16*SZREG - REG_S a4, 10*SZREG(t6) - REG_S a5, 11*SZREG(t6) - REG_S a6, 12*SZREG(t6) - REG_S a7, 13*SZREG(t6) - REG_S t0, 14*SZREG(t6) - REG_S t1, 15*SZREG(t6) - addi t6, t6, 16*SZREG - bltu a1, a3, 1b - andi a2, a2, (16*SZREG)-1 /* Update count */ - -2: - /* Remainder is smaller than a page, compute native word count */ - beqz a2, 7f - andi a5, a2, ~(SZREG-1) - andi a2, a2, (SZREG-1) - add a3, a1, a5 - /* Jump directly to last word if no words. */ - beqz a5, 4f - -3: - /* Use single native register copy */ - REG_L a4, 0(a1) - addi a1, a1, SZREG - REG_S a4, 0(t6) - addi t6, t6, SZREG - bltu a1, a3, 3b - - /* Jump directly out if no more bytes */ - beqz a2, 7f - -4: - /* Copy the last word unaligned */ - add a3, a1, a2 - add a4, t6, a2 - REG_L a5, -SZREG(a3) - REG_S a5, -SZREG(a4) - ret - -5: - /* Copy bytes when the total copy is <SZREG */ - add a3, a1, a2 - -6: - lb a4, 0(a1) - addi a1, a1, 1 - sb a4, 0(t6) - addi t6, t6, 1 - bltu a1, a3, 6b - -7: - ret - -END (__memcpy_noalignment) |