#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 strlen(char *);
int countValidCharacters(char *input) {
  int count = 0;
  for (int i = 0; i < strlen(input); i++) {
    if (input[i] != '_') {
      count++;
    }
  }
  return count;
}


x86 assembly (clang, -O0):
<countValidCharacters>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x14(%rbp),%eax
cmp    %ecx,%eax
jge    1177 <countValidCharacters+0x67>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x5f,%eax
je     1164 <countValidCharacters+0x54>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1169 <countValidCharacters+0x59>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    112a <countValidCharacters+0x1a>
mov    -0xc(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<countValidCharacters>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%r14
call   1030 <strlen@plt>
test   %eax,%eax
jle    1151 <countValidCharacters+0x41>
xor    %ebx,%ebx
xor    %ebp,%ebp
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
xor    %eax,%eax
cmpb   $0x5f,(%r14,%rbx,1)
setne  %al
add    %eax,%ebp
add    $0x1,%rbx
mov    %r14,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1130 <countValidCharacters+0x20>
jmp    1153 <countValidCharacters+0x43>
xor    %ebp,%ebp
mov    %ebp,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
define i32 @countValidCharacters(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca i32
store i8* %0, i8** %2
store i32 0, i32* %3
store i32 0, i32* %4
br label %5
5: ; preds = %22, %1
%6 = load i32, i32* %4
%7 = load i8*, i8** %2
%8 = call i32 @strlen(i8* %7)
%9 = icmp slt i32 %6, %8
br i1 %9, label %10, label %25
10: ; preds = %5
%11 = load i8*, i8** %2
%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 = sext i8 %15 to i32
%17 = icmp ne i32 %16, 95
br i1 %17, label %18, label %21
18: ; preds = %10
%19 = load i32, i32* %3
%20 = add nsw i32 %19, 1
store i32 %20, i32* %3
br label %21
21: ; preds = %18, %10
br label %22
22: ; preds = %21
%23 = load i32, i32* %4
%24 = add nsw i32 %23, 1
store i32 %24, i32* %4
br label %5
25: ; preds = %5
%26 = load i32, i32* %3
ret i32 %26
}

LLVM IR (-O2):
define i32 @countValidCharacters(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %6, label %4
4: ; preds = %6, %1
%5 = phi i32 [ 0, %1 ], [ %13, %6 ]
ret i32 %5
6: ; preds = %1, %6
%7 = phi i64 [ %14, %6 ], [ 0, %1 ]
%8 = phi i32 [ %13, %6 ], [ 0, %1 ]
%9 = getelementptr inbounds i8, i8* %0, i64 %7
%10 = load i8, i8* %9
%11 = icmp ne i8 %10, 95
%12 = zext i1 %11 to i32
%13 = add nuw nsw i32 %8, %12
%14 = add nuw nsw i64 %7, 1
%15 = tail call i32 @strlen(i8* %0)
%16 = sext i32 %15 to i64
%17 = icmp slt i64 %14, %16
br i1 %17, label %6, label %4
}