diff options
Diffstat (limited to 'newlib/libc/machine/x86_64/memset.S')
| -rw-r--r-- | newlib/libc/machine/x86_64/memset.S | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/newlib/libc/machine/x86_64/memset.S b/newlib/libc/machine/x86_64/memset.S deleted file mode 100644 index 4ba53e3c8..000000000 --- a/newlib/libc/machine/x86_64/memset.S +++ /dev/null @@ -1,88 +0,0 @@ -/* - * ==================================================== - * Copyright (C) 2007 by Ellips BV. All rights reserved. - * - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - - #include "x86_64mach.h" - - .global SYM (memset) - SOTYPE_FUNCTION(memset) - -SYM (memset): - movq rdi, r9 /* Save return value */ - movq rsi, rax - movq rdx, rcx - cmpq $16, rdx - jb byte_set - - movq rdi, r8 /* Align on quad word boundary */ - andq $7, r8 - jz quadword_aligned - movq $8, rcx - subq r8, rcx - subq rcx, rdx - rep stosb - movq rdx, rcx - -quadword_aligned: - movabs $0x0101010101010101, r8 - movzbl sil, eax - imul r8, rax - cmpq $256, rdx - jb quadword_set - - shrq $7, rcx /* Store 128 bytes at a time with minimum cache polution */ - - .p2align 4 -loop: - movntiq rax, (rdi) - movntiq rax, 8 (rdi) - movntiq rax, 16 (rdi) - movntiq rax, 24 (rdi) - movntiq rax, 32 (rdi) - movntiq rax, 40 (rdi) - movntiq rax, 48 (rdi) - movntiq rax, 56 (rdi) - movntiq rax, 64 (rdi) - movntiq rax, 72 (rdi) - movntiq rax, 80 (rdi) - movntiq rax, 88 (rdi) - movntiq rax, 96 (rdi) - movntiq rax, 104 (rdi) - movntiq rax, 112 (rdi) - movntiq rax, 120 (rdi) - - leaq 128 (rdi), rdi - - dec rcx - jnz loop - - sfence - movq rdx, rcx - andq $127, rcx - rep stosb - movq r9, rax - ret - - -byte_set: - rep stosb - movq r9, rax - ret - - -quadword_set: - shrq $3, rcx - .p2align 4 - rep stosq - movq rdx, rcx - andq $7, rcx - rep stosb /* Store the remaining bytes */ - movq r9, rax - ret - |