#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int atoi(char *);
int /*<<< orphan*/ isdigit(char);
int strlen(char *);
int date_digit(char *dt_part) {
  int i, len;
  len = strlen(dt_part);
  for (i = 0; i < len; i++) {
    if (!isdigit(dt_part[i]))
      return -1;
  }
  return atoi(dt_part);
}


x86 assembly (clang, -O0):
<date_digit>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,-0x18(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x18(%rbp),%eax
jge    1194 <date_digit+0x64>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1030 <isdigit@plt>
cmp    $0x0,%eax
jne    1181 <date_digit+0x51>
movl   $0xffffffff,-0x4(%rbp)
jmp    11a0 <date_digit+0x70>
jmp    1186 <date_digit+0x56>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    114f <date_digit+0x1f>
mov    -0x10(%rbp),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<date_digit>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r15
call   1040 <strlen@plt>
test   %eax,%eax
jle    1167 <date_digit+0x37>
mov    %eax,%r14d
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
movsbl (%r15,%rbx,1),%edi
call   1030 <isdigit@plt>
test   %eax,%eax
je     1174 <date_digit+0x44>
add    $0x1,%rbx
cmp    %rbx,%r14
jne    1150 <date_digit+0x20>
mov    %r15,%rdi
pop    %rbx
pop    %r14
pop    %r15
jmp    1050 <atoi@plt>
mov    $0xffffffff,%eax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i32 @date_digit(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
store i8* %0, i8** %3
%6 = load i8*, i8** %3
%7 = call i32 @strlen(i8* %6)
store i32 %7, i32* %5
store i32 0, i32* %4
br label %8
8: ; preds = %22, %1
%9 = load i32, i32* %4
%10 = load i32, i32* %5
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %25
12: ; preds = %8
%13 = load i8*, i8** %3
%14 = load i32, i32* %4
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = call i32 @isdigit(i8 signext %17)
%19 = icmp ne i32 %18, 0
br i1 %19, label %21, label %20
20: ; preds = %12
store i32 -1, i32* %2
br label %28
21: ; preds = %12
br label %22
22: ; preds = %21
%23 = load i32, i32* %4
%24 = add nsw i32 %23, 1
store i32 %24, i32* %4
br label %8
25: ; preds = %8
%26 = load i8*, i8** %3
%27 = call i32 @atoi(i8* %26)
store i32 %27, i32* %2
br label %28
28: ; preds = %25, %20
%29 = load i32, i32* %2
ret i32 %29
}

LLVM IR (-O2):
define i32 @date_digit(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %15
4: ; preds = %1
%5 = zext i32 %2 to i64
br label %8
6: ; preds = %8
%7 = icmp eq i64 %14, %5
br i1 %7, label %15, label %8
8: ; preds = %4, %6
%9 = phi i64 [ 0, %4 ], [ %14, %6 ]
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
%12 = tail call i32 @isdigit(i8 signext %11)
%13 = icmp eq i32 %12, 0
%14 = add nuw nsw i64 %9, 1
br i1 %13, label %17, label %6
15: ; preds = %6, %1
%16 = tail call i32 @atoi(i8* %0)
br label %17
17: ; preds = %8, %15
%18 = phi i32 [ %16, %15 ], [ -1, %8 ]
ret i32 %18
}