#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 */
typedef int uint8_t;

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void hexdump_mem(const void *data, size_t size) {
  uint8_t *ptr = (uint8_t *)data;
  for (size_t i = 0; i < size; i++)
    printf("%02x", ptr[i]);
  printf("\n");
}


x86 assembly (clang, -O0):
<hexdump_mem>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
movq   $0x0,-0x20(%rbp)
mov    -0x20(%rbp),%rax
cmp    -0x10(%rbp),%rax
jae    1168 <hexdump_mem+0x58>
mov    -0x18(%rbp),%rax
mov    -0x20(%rbp),%rcx
mov    (%rax,%rcx,4),%esi
lea    0xeb0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x20(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x20(%rbp)
jmp    1130 <hexdump_mem+0x20>
lea    0xe96(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hexdump_mem>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %rsi,%rsi
je     1157 <hexdump_mem+0x37>
mov    %rsi,%r12
mov    %rdi,%r14
lea    0xec6(%rip),%r15
xor    %ebx,%ebx
nopl   0x0(%rax)
mov    (%r14,%rbx,4),%esi
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1140 <hexdump_mem+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"\0A\00"
define void @hexdump_mem(i8* %0, i64 %1) {
%3 = alloca i8*
%4 = alloca i64
%5 = alloca i32*
%6 = alloca i64
store i8* %0, i8** %3
store i64 %1, i64* %4
%7 = load i8*, i8** %3
%8 = bitcast i8* %7 to i32*
store i32* %8, i32** %5
store i64 0, i64* %6
br label %9
9: ; preds = %19, %2
%10 = load i64, i64* %6
%11 = load i64, i64* %4
%12 = icmp ult i64 %10, %11
br i1 %12, label %13, label %22
13: ; preds = %9
%14 = load i32*, i32** %5
%15 = load i64, i64* %6
%16 = getelementptr inbounds i32, i32* %14, i64 %15
%17 = load i32, i32* %16
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %17)
br label %19
19: ; preds = %13
%20 = load i64, i64* %6
%21 = add i64 %20, 1
store i64 %21, i64* %6
br label %9
22: ; preds = %9
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret void
}

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