#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 */
scalar_t__ strchr(char *, char);
int strlen(char *);
int count_vowels(char *s) {
  int cnt = 0, i;
  for (i = 0; i < strlen(s); ++i)
    if (strchr("aeiou", s[i]))
      ++cnt;
  return cnt;
}


x86 assembly (clang, -O0):
<count_vowels>:
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    1194 <count_vowels+0x74>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
lea    0xe9b(%rip),%rdi
movsbl (%rax,%rcx,1),%esi
call   1040 <strchr@plt>
cmp    $0x0,%rax
je     1181 <count_vowels+0x61>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1186 <count_vowels+0x66>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    113a <count_vowels+0x1a>
mov    -0xc(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<count_vowels>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r15
call   1030 <strlen@plt>
test   %eax,%eax
jle    1169 <count_vowels+0x49>
xor    %ebx,%ebx
lea    0xec4(%rip),%r14
xor    %ebp,%ebp
xchg   %ax,%ax
movsbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
call   1040 <strchr@plt>
cmp    $0x1,%rax
sbb    $0xffffffff,%ebp
add    $0x1,%rbx
mov    %r15,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1140 <count_vowels+0x20>
jmp    116b <count_vowels+0x4b>
xor    %ebp,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [6 x i8] c"aeiou\00"
define i32 @count_vowels(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 = call i64 @strchr(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8 signext %15)
%17 = icmp ne i64 %16, 0
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):
@.str = [6 x i8] c"aeiou\00"
define i32 @count_vowels(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %17
4: ; preds = %1, %4
%5 = phi i64 [ %13, %4 ], [ 0, %1 ]
%6 = phi i32 [ %12, %4 ], [ 0, %1 ]
%7 = getelementptr inbounds i8, i8* %0, i64 %5
%8 = load i8, i8* %7
%9 = tail call i64 @strchr(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8 signext %8)
%10 = icmp ne i64 %9, 0
%11 = zext i1 %10 to i32
%12 = add nuw nsw i32 %6, %11
%13 = add nuw nsw i64 %5, 1
%14 = tail call i32 @strlen(i8* %0)
%15 = sext i32 %14 to i64
%16 = icmp slt i64 %13, %15
br i1 %16, label %4, label %17
17: ; preds = %4, %1
%18 = phi i32 [ 0, %1 ], [ %12, %4 ]
ret i32 %18
}