diff options
Diffstat (limited to 'mdk-stage1/dietlibc/i386/atoll.S')
| -rw-r--r-- | mdk-stage1/dietlibc/i386/atoll.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/i386/atoll.S b/mdk-stage1/dietlibc/i386/atoll.S new file mode 100644 index 000000000..093bf762a --- /dev/null +++ b/mdk-stage1/dietlibc/i386/atoll.S @@ -0,0 +1,64 @@ + +.text +.type atoll,@function +.global atoll + +atoll: + movl 4(%esp),%ecx + push %edi + + xorl %edi,%edi # sign = 0 + + decl %ecx +.Lspaces: + incl %ecx # while ( isspace(*p) ) p++; + movb (%ecx),%al + cmpb $' ',%al + je .Lspaces + subb $9,%al + cmpb $5,%al + jc .Lspaces # c = *p - 9; + + cmpb $'+'-9,%al # if ( c == '+' - 9 ) p++; + je .Lpos + cmpb $'-'-9,%al # else if ( c == '-' - 9 ) sign = -sign, p++; + jne .Lnosign + decl %edi +.Lpos: incl %ecx +.Lnosign: + + push %ebx + push %esi + push %ebp + movl $10,%ebp + + xorl %esi,%esi # Hi(value) = 0; + xorl %eax,%eax # Lo(value) = 0; +.Lcont: movzbl (%ecx),%ebx # while ( (unsigned) (*p - '0') < 10 ) + inc %ecx + subl $'0',%ebx + cmpl %ebp,%ebx + jnc .Lfini + imull %ebp,%esi # value *= 10, + mull %ebp + addl %edx,%esi + addl %ebx,%eax # value += (*p - '0'); + adcl $0,%esi + jmp .Lcont + +.Lfini: xchg %edx,%esi # return sign== 0 ? +value + xorl %edi,%eax # sign==-1 ? -value + xorl %edi,%edx + subl %edi,%eax + sbbl %edi,%edx + + pop %ebp + pop %esi + pop %ebx + pop %edi + ret + +.Lende: + +.size atoll,.Lende-atoll + |