#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 *, char const);
size_t strspn(const char *s, const char *accept) {
  const char *ss = s;
  while (*s && strchr(accept, *s) != NULL) {
    ++s;
  }
  return s - ss;
}


x86 assembly (clang, -O0):
<strspn>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%rax
movsbl (%rax),%ecx
xor    %eax,%eax
cmp    $0x0,%ecx
mov    %al,-0x19(%rbp)
je     1157 <strspn+0x47>
mov    -0x10(%rbp),%rdi
mov    -0x8(%rbp),%rax
movsbl (%rax),%esi
call   1030 <strchr@plt>
cmp    $0x0,%rax
setne  %al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
test   $0x1,%al
jne    1167 <strspn+0x57>
jmp    1178 <strspn+0x68>
mov    -0x8(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x8(%rbp)
jmp    1128 <strspn+0x18>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
sub    %rcx,%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<strspn>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r14
mov    (%rdi),%al
mov    %rdi,%rbx
test   %al,%al
je     114c <strspn+0x3c>
mov    %rsi,%r15
mov    %r14,%rbx
nopw   0x0(%rax,%rax,1)
movsbl %al,%esi
mov    %r15,%rdi
call   1030 <strchr@plt>
test   %rax,%rax
je     114c <strspn+0x3c>
movzbl 0x1(%rbx),%eax
add    $0x1,%rbx
test   %al,%al
jne    1130 <strspn+0x20>
sub    %r14,%rbx
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

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

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