#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 *, ...);
void printHexMessage(char *m, int length) {
  for (size_t i = 0; i < length; i++) {
    printf("%02x", m[i]);
    printf(" ");
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<printHexMessage>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
movslq -0xc(%rbp),%rcx
cmp    %rcx,%rax
jae    1171 <printHexMessage+0x61>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
movsbl (%rax,%rcx,1),%esi
lea    0xeb5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeac(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1127 <printHexMessage+0x17>
lea    0xe8f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<printHexMessage>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %esi,%esi
je     1162 <printHexMessage+0x42>
mov    %rdi,%r15
movslq %esi,%r12
lea    0xec7(%rip),%r14
xor    %ebx,%ebx
nopl   0x0(%rax,%rax,1)
movsbl (%r15,%rbx,1),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0x20,%edi
call   1030 <putchar@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1140 <printHexMessage+0x20>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

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

LLVM IR (-O2):
@.str = [5 x i8] c"%02x\00"
define void @printHexMessage(i8* nocapture %0, i32 %1) {
%3 = icmp eq i32 %1, 0
br i1 %3, label %6, label %4
4: ; preds = %2
%5 = sext i32 %1 to i64
br label %8
6: ; preds = %8, %2
%7 = tail call i32 @putchar(i32 10)
ret void
8: ; preds = %4, %8
%9 = phi i64 [ %15, %8 ], [ 0, %4 ]
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
%12 = sext i8 %11 to i32
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %12)
%14 = tail call i32 @putchar(i32 32)
%15 = add nuw i64 %9, 1
%16 = icmp eq i64 %15, %5
br i1 %16, label %6, label %8
}