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Cleanups/optimizations.

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This commit is contained in:
Rene Gollent
2012-07-02 19:42:20 -04:00
parent dc5a16bb70
commit 29291c8c92
1 changed files with 6 additions and 13 deletions
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src/system/kernel/arch/x86/arch_x86.S
+6 -13
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@@ -278,9 +278,8 @@ FUNCTION(arch_cpu_user_strlcpy):
/* If count is now 0, skip straight to null terminating /* If count is now 0, skip straight to null terminating
as our loop will otherwise overflow */ as our loop will otherwise overflow */
cmp $0,%ecx jnz .L_user_strlcpy_copy_begin
jne .L_user_strlcpy_copy_begin movb $0,(%edi)
movb $0,(%edi)
jmp .L_user_strlcpy_source_count jmp .L_user_strlcpy_source_count
.L_user_strlcpy_copy_begin: .L_user_strlcpy_copy_begin:
@@ -289,30 +288,24 @@ FUNCTION(arch_cpu_user_strlcpy):
/* move data by bytes */ /* move data by bytes */
movsb movsb
cmpb $0,-1(%esi) cmpb $0,-1(%esi)
je .L_user_strlcpy_copy_loop_done je .L_user_strlcpy_source_done
loop .L_user_strlcpy_copy_loop loop .L_user_strlcpy_copy_loop
.L_user_strlcpy_copy_loop_done:
/* check if we copied the entire source string */
cmp $0,%ecx
jne .L_user_strlcpy_source_done
.L_user_strlcpy_zero_terminate:
/* null terminate string */ /* null terminate string */
movb $0,(%edi) movb $0,(%edi)
dec %esi dec %esi
/* count remaining bytes in src */ /* count remaining bytes in src */
.L_user_strlcpy_source_count: .L_user_strlcpy_source_count:
not %ecx not %ecx
movb $0,%al xor %al,%al
repnz repnz
scasb scasb
.L_user_strlcpy_source_done: .L_user_strlcpy_source_done:
movl %esi,%eax movl %esi,%eax
subl 20(%esp),%eax subl 20(%esp),%eax
subl $1,%eax dec %eax
/* restore the old fault handler */ /* restore the old fault handler */
movl %ebx,(%edx) movl %ebx,(%edx)