#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*/ *strchr(char const *, int /*<<< orphan*/);
size_t strcspn(const char *s, const char *reject) {
  size_t count = 0;
  while (*s != '\0') {
    if (strchr(reject, *s++) == NULL) {
      ++count;
    } else {
      return count;
    }
  }
  return count;
}


x86 assembly (clang, -O0):
<strcspn>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
movq   $0x0,-0x20(%rbp)
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x0,%eax
je     1180 <strcspn+0x70>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x1,%rcx
mov    %rcx,-0x10(%rbp)
movsbl (%rax),%esi
call   1030 <strchr@plt>
cmp    $0x0,%rax
jne    116e <strcspn+0x5e>
mov    -0x20(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x20(%rbp)
jmp    117b <strcspn+0x6b>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
jmp    1188 <strcspn+0x78>
jmp    1128 <strcspn+0x18>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<strcspn>:
push   %r15
push   %r14
push   %rbx
mov    (%rdi),%al
test   %al,%al
je     1150 <strcspn+0x40>
mov    %rsi,%r14
mov    %rdi,%r15
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
movsbl %al,%esi
mov    %r14,%rdi
call   1030 <strchr@plt>
test   %rax,%rax
jne    1152 <strcspn+0x42>
movzbl 0x1(%r15,%rbx,1),%eax
add    $0x1,%rbx
test   %al,%al
jne    1130 <strcspn+0x20>
jmp    1152 <strcspn+0x42>
xor    %ebx,%ebx
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

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

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