#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 /*<<< orphan*/ is_digit(char);
int strlen(char *);
int is_integer(char *s) {
  int len = strlen(s);
  for (int i = 0; i < len; i++) {
    if (!is_digit(s[i]))
      return 0;
  }
  return 1;
}


x86 assembly (clang, -O0):
<is_integer>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    1184 <is_integer+0x64>
mov    -0x10(%rbp),%rax
movslq -0x18(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1040 <is_digit@plt>
cmp    $0x0,%eax
jne    1171 <is_integer+0x51>
movl   $0x0,-0x4(%rbp)
jmp    118b <is_integer+0x6b>
jmp    1176 <is_integer+0x56>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    113f <is_integer+0x1f>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_integer>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%r14
call   1030 <strlen@plt>
test   %eax,%eax
jle    1174 <is_integer+0x54>
mov    %eax,%ebp
movsbl (%r14),%edi
call   1040 <is_digit@plt>
test   %eax,%eax
je     117b <is_integer+0x5b>
mov    %ebp,%ebp
mov    $0x1,%ecx
cs nopw 0x0(%rax,%rax,1)
mov    %rcx,%rbx
cmp    %rcx,%rbp
je     116a <is_integer+0x4a>
movsbl (%r14,%rbx,1),%edi
call   1040 <is_digit@plt>
lea    0x1(%rbx),%rcx
test   %eax,%eax
jne    1150 <is_integer+0x30>
xor    %eax,%eax
cmp    %rbp,%rbx
setae  %al
jmp    117d <is_integer+0x5d>
mov    $0x1,%eax
jmp    117d <is_integer+0x5d>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
define i32 @is_integer(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* %4
store i32 0, i32* %5
br label %8
8: ; preds = %22, %1
%9 = load i32, i32* %5
%10 = load i32, i32* %4
%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* %5
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = call i32 @is_digit(i8 signext %17)
%19 = icmp ne i32 %18, 0
br i1 %19, label %21, label %20
20: ; preds = %12
store i32 0, i32* %2
br label %26
21: ; preds = %12
br label %22
22: ; preds = %21
%23 = load i32, i32* %5
%24 = add nsw i32 %23, 1
store i32 %24, i32* %5
br label %8
25: ; preds = %8
store i32 1, i32* %2
br label %26
26: ; preds = %25, %20
%27 = load i32, i32* %2
ret i32 %27
}

LLVM IR (-O2):
define i32 @is_integer(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %22
4: ; preds = %1
%5 = zext i32 %2 to i64
%6 = zext i32 %2 to i64
%7 = load i8, i8* %0
%8 = tail call i32 @is_digit(i8 signext %7)
%9 = icmp eq i32 %8, 0
br i1 %9, label %22, label %10
10: ; preds = %4, %13
%11 = phi i64 [ %18, %13 ], [ 1, %4 ]
%12 = icmp eq i64 %11, %6
br i1 %12, label %19, label %13
13: ; preds = %10
%14 = getelementptr inbounds i8, i8* %0, i64 %11
%15 = load i8, i8* %14
%16 = tail call i32 @is_digit(i8 signext %15)
%17 = icmp eq i32 %16, 0
%18 = add nuw nsw i64 %11, 1
br i1 %17, label %19, label %10
19: ; preds = %10, %13
%20 = icmp uge i64 %11, %5
%21 = zext i1 %20 to i32
br label %22
22: ; preds = %19, %4, %1
%23 = phi i32 [ 1, %1 ], [ 0, %4 ], [ %21, %19 ]
ret i32 %23
}