#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*/ isdigit(char const);
int str_is_integer(char const *str) {
  if ('\0' == *str) {
    return 0;
  }
  while (*str) {
    if (!isdigit(*str)) {
      return 0;
    }
    ++str;
  }
  return !0;
}


x86 assembly (clang, -O0):
<str_is_integer>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rax
movsbl (%rax),%ecx
xor    %eax,%eax
cmp    %ecx,%eax
jne    1139 <str_is_integer+0x29>
movl   $0x0,-0x4(%rbp)
jmp    1184 <str_is_integer+0x74>
jmp    113e <str_is_integer+0x2e>
mov    -0x10(%rbp),%rax
cmpb   $0x0,(%rax)
je     117d <str_is_integer+0x6d>
mov    -0x10(%rbp),%rax
movsbl (%rax),%edi
call   1030 <isdigit@plt>
cmp    $0x0,%eax
jne    116c <str_is_integer+0x5c>
movl   $0x0,-0x4(%rbp)
jmp    1184 <str_is_integer+0x74>
mov    -0x10(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x10(%rbp)
jmp    113e <str_is_integer+0x2e>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<str_is_integer>:
push   %rbp
push   %rbx
push   %rax
mov    (%rdi),%al
xor    %ebp,%ebp
test   %al,%al
je     114c <str_is_integer+0x3c>
mov    %rdi,%rbx
add    $0x1,%rbx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
movsbl %al,%edi
call   1030 <isdigit@plt>
test   %eax,%eax
je     114c <str_is_integer+0x3c>
movzbl (%rbx),%eax
add    $0x1,%rbx
test   %al,%al
jne    1130 <str_is_integer+0x20>
mov    $0x1,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

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

LLVM IR (-O2):
define i32 @str_is_integer(i8* nocapture %0) {
%2 = load i8, i8* %0
%3 = icmp eq i8 %2, 0
br i1 %3, label %13, label %4
4: ; preds = %1, %9
%5 = phi i8* [ %10, %9 ], [ %0, %1 ]
%6 = phi i8 [ %11, %9 ], [ %2, %1 ]
%7 = tail call i32 @isdigit(i8 signext %6)
%8 = icmp eq i32 %7, 0
br i1 %8, label %13, label %9
9: ; preds = %4
%10 = getelementptr inbounds i8, i8* %5, i64 1
%11 = load i8, i8* %10
%12 = icmp eq i8 %11, 0
br i1 %12, label %13, label %4
13: ; preds = %4, %9, %1
%14 = phi i32 [ 0, %1 ], [ 0, %4 ], [ 1, %9 ]
ret i32 %14
}