diff options
| -rw-r--r-- | src/string/i386/memset.s | 47 | ||||
| -rw-r--r-- | src/string/x86_64/memset.s | 41 |
2 files changed, 88 insertions, 0 deletions
diff --git a/src/string/i386/memset.s b/src/string/i386/memset.s new file mode 100644 index 00000000..06ac923e --- /dev/null +++ b/src/string/i386/memset.s @@ -0,0 +1,47 @@ +.global memset +.type memset,@function +memset: + mov 8(%esp),%al + push %edi + mov %al,%ah + mov %al,%dl + mov 16(%esp),%ecx + shl $16,%eax + mov 8(%esp),%edi + mov %dl,%al + mov %dl,%ah + cmp $16,%ecx + jb 1f + + mov %eax,-4(%edi,%ecx) + shr $2,%ecx + rep + stosl + mov 8(%esp),%eax + pop %edi + ret + +1: test %ecx,%ecx + jz 1f + + mov %al,(%edi) + mov %al,-1(%edi,%ecx) + cmp $2,%ecx + jbe 1f + + mov %al,1(%edi) + mov %al,-2(%edi,%ecx) + cmp $4,%ecx + jbe 1f + + mov %eax,(%edi) + mov %eax,-4(%edi,%ecx) + cmp $8,%ecx + jbe 1f + + mov %eax,4(%edi) + mov %eax,-8(%edi,%ecx) + +1: mov 8(%esp),%eax + pop %edi + ret diff --git a/src/string/x86_64/memset.s b/src/string/x86_64/memset.s new file mode 100644 index 00000000..fc06eef8 --- /dev/null +++ b/src/string/x86_64/memset.s @@ -0,0 +1,41 @@ +.global memset +.type memset,@function +memset: + and $0xff,%esi + mov $0x101010101010101,%rax + mov %rdx,%rcx + mov %rdi,%r8 + imul %rsi,%rax + cmp $16,%rcx + jb 1f + + mov %rax,-8(%rdi,%rcx) + shr $3,%rcx + rep + stosq + mov %r8,%rax + ret + +1: test %ecx,%ecx + jz 1f + + mov %al,(%rdi) + mov %al,-1(%rdi,%rcx) + cmp $2,%ecx + jbe 1f + + mov %al,1(%rdi) + mov %al,-2(%rdi,%rcx) + cmp $4,%ecx + jbe 1f + + mov %eax,(%rdi) + mov %eax,-4(%rdi,%rcx) + cmp $8,%ecx + jbe 1f + + mov %eax,4(%rdi) + mov %eax,-8(%rdi,%rcx) + +1: mov %r8,%rax + ret |