#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 strlen(char *);
int check_number(char *data) {
  int i, size;
  size = strlen(data);
  for (i = 0; i < size; i++) {
    if (data[i] < '0' || data[i] > '9') {
      return -1;
    }
  }
  return 0;
}


x86 assembly (clang, -O0):
<check_number>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x18(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x18(%rbp),%eax
jge    1184 <check_number+0x74>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x30,%eax
jl     1165 <check_number+0x55>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x39,%eax
jle    1171 <check_number+0x61>
movl   $0xffffffff,-0x4(%rbp)
jmp    118b <check_number+0x7b>
jmp    1176 <check_number+0x66>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    112f <check_number+0x1f>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<check_number>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
test   %eax,%eax
jle    1145 <check_number+0x35>
mov    %eax,%eax
xor    %ecx,%ecx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
movzbl (%rbx,%rcx,1),%edx
add    $0xc6,%dl
cmp    $0xf5,%dl
jbe    1149 <check_number+0x39>
add    $0x1,%rcx
cmp    %rcx,%rax
jne    1130 <check_number+0x20>
xor    %eax,%eax
pop    %rbx
ret
mov    $0xffffffff,%eax
pop    %rbx
ret

LLVM IR (-O0):
define i32 @check_number(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 = %30, %1
%9 = load i32, i32* %4
%10 = load i32, i32* %5
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %33
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 = sext i8 %17 to i32
%19 = icmp slt i32 %18, 48
br i1 %19, label %28, label %20
20: ; preds = %12
%21 = load i8*, i8** %3
%22 = load i32, i32* %4
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8, i8* %21, i64 %23
%25 = load i8, i8* %24
%26 = sext i8 %25 to i32
%27 = icmp sgt i32 %26, 57
br i1 %27, label %28, label %29
28: ; preds = %20, %12
store i32 -1, i32* %2
br label %34
29: ; preds = %20
br label %30
30: ; preds = %29
%31 = load i32, i32* %4
%32 = add nsw i32 %31, 1
store i32 %32, i32* %4
br label %8
33: ; preds = %8
store i32 0, i32* %2
br label %34
34: ; preds = %33, %28
%35 = load i32, i32* %2
ret i32 %35
}

LLVM IR (-O2):
define i32 @check_number(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 = add i8 %11, -58
%13 = icmp ult i8 %12, -10
%14 = add nuw nsw i64 %9, 1
br i1 %13, label %15, label %6
15: ; preds = %8, %6, %1
%16 = phi i32 [ 0, %1 ], [ 0, %6 ], [ -1, %8 ]
ret i32 %16
}