#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*/ isAlphanumeric(char);
int strlen(char *);
char *brk(char *s1) {
  int i;
  for (i = 0; i < strlen(s1); i++) {
    if (!isAlphanumeric(s1[i])) {
      return s1 + i;
    }
  }
  return NULL;
}


x86 assembly (clang, -O0):
<brk>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%eax
cmp    %ecx,%eax
jge    1190 <brk+0x70>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1040 <isAlphanumeric@plt>
cmp    $0x0,%eax
jne    117d <brk+0x5d>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
add    %rcx,%rax
mov    %rax,-0x8(%rbp)
jmp    1198 <brk+0x78>
jmp    1182 <brk+0x62>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1133 <brk+0x13>
movq   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<brk>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r15
call   1030 <strlen@plt>
xor    %r14d,%r14d
test   %eax,%eax
jle    1169 <brk+0x49>
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
movsbl (%r15,%rbx,1),%edi
call   1040 <isAlphanumeric@plt>
test   %eax,%eax
je     1163 <brk+0x43>
add    $0x1,%rbx
mov    %r15,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1140 <brk+0x20>
jmp    1169 <brk+0x49>
add    %rbx,%r15
mov    %r15,%r14
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
define i8* @brk(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %18
4: ; preds = %1, %10
%5 = phi i64 [ %11, %10 ], [ 0, %1 ]
%6 = getelementptr inbounds i8, i8* %0, i64 %5
%7 = load i8, i8* %6
%8 = tail call i32 @isAlphanumeric(i8 signext %7)
%9 = icmp eq i32 %8, 0
br i1 %9, label %15, label %10
10: ; preds = %4
%11 = add nuw nsw i64 %5, 1
%12 = tail call i32 @strlen(i8* %0)
%13 = sext i32 %12 to i64
%14 = icmp slt i64 %11, %13
br i1 %14, label %4, label %18
15: ; preds = %4
%16 = and i64 %5, 4294967295
%17 = getelementptr inbounds i8, i8* %0, i64 %16
br label %18
18: ; preds = %10, %1, %15
%19 = phi i8* [ %17, %15 ], [ null, %1 ], [ null, %10 ]
ret i8* %19
}