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Last change
on this file since 690 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.7 KB
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| 1 | /* |
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| 2 | * ==================================================== |
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| 3 | * Copyright (C) 2007 by Ellips BV. All rights reserved. |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this |
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| 6 | * software is freely granted, provided that this notice |
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| 7 | * is preserved. |
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| 8 | * ==================================================== |
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| 9 | */ |
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| 10 | |
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| 11 | #include "x86_64mach.h" |
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| 12 | |
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| 13 | .global SYM (memset) |
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| 14 | SOTYPE_FUNCTION(memset) |
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| 15 | |
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| 16 | SYM (memset): |
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| 17 | movq rdi, r9 /* Save return value */ |
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| 18 | movq rsi, rax |
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| 19 | movq rdx, rcx |
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| 20 | cmpq $16, rdx |
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| 21 | jb byte_set |
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| 22 | |
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| 23 | movq rdi, r8 /* Align on quad word boundary */ |
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| 24 | andq $7, r8 |
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| 25 | jz quadword_aligned |
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| 26 | movq $8, rcx |
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| 27 | subq r8, rcx |
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| 28 | subq rcx, rdx |
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| 29 | rep stosb |
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| 30 | movq rdx, rcx |
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| 31 | |
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| 32 | quadword_aligned: |
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| 33 | movabs $0x0101010101010101, r8 |
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| 34 | movzbl sil, eax |
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| 35 | imul r8, rax |
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| 36 | cmpq $256, rdx |
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| 37 | jb quadword_set |
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| 38 | |
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| 39 | shrq $7, rcx /* Store 128 bytes at a time with minimum cache polution */ |
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| 40 | |
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| 41 | .p2align 4 |
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| 42 | loop: |
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| 43 | movntiq rax, (rdi) |
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| 44 | movntiq rax, 8 (rdi) |
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| 45 | movntiq rax, 16 (rdi) |
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| 46 | movntiq rax, 24 (rdi) |
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| 47 | movntiq rax, 32 (rdi) |
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| 48 | movntiq rax, 40 (rdi) |
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| 49 | movntiq rax, 48 (rdi) |
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| 50 | movntiq rax, 56 (rdi) |
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| 51 | movntiq rax, 64 (rdi) |
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| 52 | movntiq rax, 72 (rdi) |
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| 53 | movntiq rax, 80 (rdi) |
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| 54 | movntiq rax, 88 (rdi) |
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| 55 | movntiq rax, 96 (rdi) |
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| 56 | movntiq rax, 104 (rdi) |
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| 57 | movntiq rax, 112 (rdi) |
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| 58 | movntiq rax, 120 (rdi) |
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| 59 | |
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| 60 | leaq 128 (rdi), rdi |
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| 61 | |
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| 62 | dec rcx |
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| 63 | jnz loop |
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| 64 | |
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| 65 | sfence |
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| 66 | movq rdx, rcx |
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| 67 | andq $127, rcx |
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| 68 | rep stosb |
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| 69 | movq r9, rax |
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| 70 | ret |
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| 71 | |
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| 72 | |
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| 73 | byte_set: |
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| 74 | rep stosb |
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| 75 | movq r9, rax |
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| 76 | ret |
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| 77 | |
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| 78 | |
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| 79 | quadword_set: |
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| 80 | shrq $3, rcx |
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| 81 | .p2align 4 |
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| 82 | rep stosq |
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| 83 | movq rdx, rcx |
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| 84 | andq $7, rcx |
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| 85 | rep stosb /* Store the remaining bytes */ |
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| 86 | movq r9, rax |
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| 87 | ret |
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| 88 | |
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