#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*/ printf(char *, char, char);
int main(int argc, char *argv[]) {
  char *str = "hello world!";
  char ascii;
  ascii = *str;
  do {
    printf("\n%c:0x%02x", ascii, ascii);
    str++;
    ascii = *str;
  } while (ascii != '\0');
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xed3(%rip),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
mov    (%rax),%al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
lea    0xec9(%rip),%rdi
movsbl %al,%esi
movsbl -0x19(%rbp),%edx
call   1030 <printf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
mov    (%rax),%al
mov    %al,-0x19(%rbp)
movsbl -0x19(%rbp),%eax
cmp    $0x0,%eax
jne    113a <main+0x2a>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xee8(%rip),%rbx
mov    %rbx,%rdi
mov    $0x68,%esi
mov    $0x68,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x65,%esi
mov    $0x65,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x6c,%esi
mov    $0x6c,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x6c,%esi
mov    $0x6c,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x6f,%esi
mov    $0x6f,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x20,%esi
mov    $0x20,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x77,%esi
mov    $0x77,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x6f,%esi
mov    $0x6f,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x72,%esi
mov    $0x72,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x6c,%esi
mov    $0x6c,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x64,%esi
mov    $0x64,%edx
call   1030 <printf@plt>
mov    %rbx,%rdi
mov    $0x21,%esi
mov    $0x21,%edx
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [13 x i8] c"hello world!\00"
@.str.1 = [11 x i8] c"\0A%c:0x%02x\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8*
%7 = alloca i8
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i8** %6
%8 = load i8*, i8** %6
%9 = load i8, i8* %8
store i8 %9, i8* %7
br label %10
10: ; preds = %18, %2
%11 = load i8, i8* %7
%12 = load i8, i8* %7
%13 = call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext %11, i8 signext %12)
%14 = load i8*, i8** %6
%15 = getelementptr inbounds i8, i8* %14, i32 1
store i8* %15, i8** %6
%16 = load i8*, i8** %6
%17 = load i8, i8* %16
store i8 %17, i8* %7
br label %18
18: ; preds = %10
%19 = load i8, i8* %7
%20 = sext i8 %19 to i32
%21 = icmp ne i32 %20, 0
br i1 %21, label %10, label %22
22: ; preds = %18
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [11 x i8] c"\0A%c:0x%02x\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 104, i8 signext 104)
%4 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 101, i8 signext 101)
%5 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 108, i8 signext 108)
%6 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 108, i8 signext 108)
%7 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 111, i8 signext 111)
%8 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 32, i8 signext 32)
%9 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 119, i8 signext 119)
%10 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 111, i8 signext 111)
%11 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 114, i8 signext 114)
%12 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 108, i8 signext 108)
%13 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 100, i8 signext 100)
%14 = tail call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.1, i64 0, i64 0), i8 signext 33, i8 signext 33)
ret i32 0
}