#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*/ assert(int);
int /*<<< orphan*/ free(char *);
scalar_t__ malloc(int);
int /*<<< orphan*/ memset(char *, char, size_t);
size_t strspn(char *, char *);
int main(int argc, char **argv) {
  size_t size = 100;
  char fill = 'o';
  char *s1 = (char *)malloc(size);
  char *s2 = (char *)malloc(2);
  memset(s1, fill, size);
  s1[0] = s2[0] = 'z';
  s2[1] = '\0';
  size_t r = strspn(s1, s2);
  assert(r == 1);
  free(s1);
  free(s2);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movq   $0x64,-0x18(%rbp)
movb   $0x6f,-0x19(%rbp)
mov    -0x18(%rbp),%rax
mov    %eax,%edi
call   1070 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    $0x2,%edi
call   1070 <malloc@plt>
mov    %rax,-0x30(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x19(%rbp),%al
mov    -0x18(%rbp),%rdx
movsbl %al,%esi
call   1040 <memset@plt>
mov    -0x30(%rbp),%rax
movb   $0x7a,(%rax)
mov    -0x28(%rbp),%rax
movb   $0x7a,(%rax)
mov    -0x30(%rbp),%rax
movb   $0x0,0x1(%rax)
mov    -0x28(%rbp),%rdi
mov    -0x30(%rbp),%rsi
call   1050 <strspn@plt>
mov    %rax,-0x38(%rbp)
cmpq   $0x1,-0x38(%rbp)
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1060 <assert@plt>
mov    -0x28(%rbp),%rdi
call   1030 <free@plt>
mov    -0x30(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
mov    $0x64,%edi
call   1070 <malloc@plt>
mov    %rax,%r14
mov    $0x2,%edi
call   1070 <malloc@plt>
mov    %rax,%rbx
mov    $0x64,%edx
mov    %r14,%rdi
mov    $0x6f,%esi
call   1040 <memset@plt>
movb   $0x7a,(%rbx)
movb   $0x7a,(%r14)
movb   $0x0,0x1(%rbx)
mov    %r14,%rdi
mov    %rbx,%rsi
call   1050 <strspn@plt>
xor    %edi,%edi
cmp    $0x1,%rax
sete   %dil
call   1060 <assert@plt>
mov    %r14,%rdi
call   1030 <free@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i64
%7 = alloca i8
%8 = alloca i8*
%9 = alloca i8*
%10 = alloca i64
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i64 100, i64* %6
store i8 111, i8* %7
%11 = load i64, i64* %6
%12 = trunc i64 %11 to i32
%13 = call i64 @malloc(i32 %12)
%14 = inttoptr i64 %13 to i8*
store i8* %14, i8** %8
%15 = call i64 @malloc(i32 2)
%16 = inttoptr i64 %15 to i8*
store i8* %16, i8** %9
%17 = load i8*, i8** %8
%18 = load i8, i8* %7
%19 = load i64, i64* %6
%20 = call i32 @memset(i8* %17, i8 signext %18, i64 %19)
%21 = load i8*, i8** %9
%22 = getelementptr inbounds i8, i8* %21, i64 0
store i8 122, i8* %22
%23 = load i8*, i8** %8
%24 = getelementptr inbounds i8, i8* %23, i64 0
store i8 122, i8* %24
%25 = load i8*, i8** %9
%26 = getelementptr inbounds i8, i8* %25, i64 1
store i8 0, i8* %26
%27 = load i8*, i8** %8
%28 = load i8*, i8** %9
%29 = call i64 @strspn(i8* %27, i8* %28)
store i64 %29, i64* %10
%30 = load i64, i64* %10
%31 = icmp eq i64 %30, 1
%32 = zext i1 %31 to i32
%33 = call i32 @assert(i32 %32)
%34 = load i8*, i8** %8
%35 = call i32 @free(i8* %34)
%36 = load i8*, i8** %9
%37 = call i32 @free(i8* %36)
ret i32 0
}

LLVM IR (-O2):
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i64 @malloc(i32 100)
%4 = inttoptr i64 %3 to i8*
%5 = tail call i64 @malloc(i32 2)
%6 = inttoptr i64 %5 to i8*
%7 = tail call i32 @memset(i8* %4, i8 signext 111, i64 100)
store i8 122, i8* %6
store i8 122, i8* %4
%8 = getelementptr inbounds i8, i8* %6, i64 1
store i8 0, i8* %8
%9 = tail call i64 @strspn(i8* %4, i8* %6)
%10 = icmp eq i64 %9, 1
%11 = zext i1 %10 to i32
%12 = tail call i32 @assert(i32 %11)
%13 = tail call i32 @free(i8* %4)
%14 = tail call i32 @free(i8* %6)
ret i32 0
}