#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_int(char *in) {
  int i = 0;
  int numeric = 1;
  for (i = 0; i < strlen(in); i++) {
    if ((in[i] < 48) || (in[i] > 57)) {
      numeric = 0;
      break;
    }
  }
  return numeric;
}


x86 assembly (clang, -O0):
<check_int>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
movl   $0x1,-0x10(%rbp)
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x14(%rbp),%eax
cmp    %ecx,%eax
jge    1196 <check_int+0x86>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x30,%eax
jl     1177 <check_int+0x67>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x39,%eax
jle    1183 <check_int+0x73>
movl   $0x0,-0x10(%rbp)
jmp    1196 <check_int+0x86>
jmp    1188 <check_int+0x78>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1131 <check_int+0x21>
mov    -0x10(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<check_int>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
mov    $0x1,%r14d
test   %eax,%eax
jle    1152 <check_int+0x42>
xor    %ebp,%ebp
nopl   0x0(%rax,%rax,1)
movzbl (%rbx,%rbp,1),%eax
add    $0xc6,%al
cmp    $0xf5,%al
jbe    114f <check_int+0x3f>
add    $0x1,%rbp
mov    %rbx,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbp
jl     1130 <check_int+0x20>
jmp    1152 <check_int+0x42>
xor    %r14d,%r14d
mov    %r14d,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
define i32 @check_int(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca i32
store i8* %0, i8** %2
store i32 0, i32* %3
store i32 1, i32* %4
store i32 0, i32* %3
br label %5
5: ; preds = %28, %1
%6 = load i32, i32* %3
%7 = load i8*, i8** %2
%8 = call i32 @strlen(i8* %7)
%9 = icmp slt i32 %6, %8
br i1 %9, label %10, label %31
10: ; preds = %5
%11 = load i8*, i8** %2
%12 = load i32, i32* %3
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %11, i64 %13
%15 = load i8, i8* %14
%16 = sext i8 %15 to i32
%17 = icmp slt i32 %16, 48
br i1 %17, label %26, label %18
18: ; preds = %10
%19 = load i8*, i8** %2
%20 = load i32, i32* %3
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i8, i8* %19, i64 %21
%23 = load i8, i8* %22
%24 = sext i8 %23 to i32
%25 = icmp sgt i32 %24, 57
br i1 %25, label %26, label %27
26: ; preds = %18, %10
store i32 0, i32* %4
br label %31
27: ; preds = %18
br label %28
28: ; preds = %27
%29 = load i32, i32* %3
%30 = add nsw i32 %29, 1
store i32 %30, i32* %3
br label %5
31: ; preds = %26, %5
%32 = load i32, i32* %4
ret i32 %32
}

LLVM IR (-O2):
define i32 @check_int(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %8, label %15
4: ; preds = %8
%5 = tail call i32 @strlen(i8* %0)
%6 = sext i32 %5 to i64
%7 = icmp slt i64 %14, %6
br i1 %7, label %8, label %15
8: ; preds = %1, %4
%9 = phi i64 [ %14, %4 ], [ 0, %1 ]
%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 %4
15: ; preds = %4, %8, %1
%16 = phi i32 [ 1, %1 ], [ 0, %8 ], [ 1, %4 ]
ret i32 %16
}