#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 size_t uint32_t;

/* Variables and functions */
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, ...);
int /*<<< orphan*/ stdout;
void dump_buffer(unsigned char *b, size_t len) {
  if (len <= 0)
    return;
  uint32_t i;
  fprintf(stdout, "buffer: ");
  for (i = 0; i < len; i++)
    fprintf(stdout, "%02x ", b[i]);
  fprintf(stdout, "\n");
}


x86 assembly (clang, -O0):
<dump_buffer>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
ja     1130 <dump_buffer+0x20>
jmp    11a8 <dump_buffer+0x98>
mov    0x2ea9(%rip),%rax
mov    (%rax),%edi
lea    0xec0(%rip),%rsi
mov    $0x0,%al
call   1030 <fprintf@plt>
movq   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%rax
cmp    -0x10(%rbp),%rax
jae    1191 <dump_buffer+0x81>
mov    0x2e7c(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
movzbl (%rax,%rcx,1),%edx
lea    0xe90(%rip),%rsi
mov    $0x0,%al
call   1030 <fprintf@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    114f <dump_buffer+0x3f>
mov    0x2e48(%rip),%rax
mov    (%rax),%edi
lea    0xe6e(%rip),%rsi
mov    $0x0,%al
call   1030 <fprintf@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<dump_buffer>:
test   %rsi,%rsi
je     1187 <dump_buffer+0x77>
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
mov    %rsi,%r13
mov    %rdi,%r14
mov    0x2eb5(%rip),%r12
mov    (%r12),%edi
lea    0xeca(%rip),%rsi
xor    %eax,%eax
call   1030 <fprintf@plt>
lea    0xec5(%rip),%r15
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
mov    (%r12),%edi
movzbl (%r14,%rbx,1),%edx
mov    %r15,%rsi
xor    %eax,%eax
call   1030 <fprintf@plt>
add    $0x1,%rbx
cmp    %rbx,%r13
jne    1150 <dump_buffer+0x40>
mov    (%r12),%edi
lea    0xe98(%rip),%rsi
xor    %eax,%eax
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
jmp    1030 <fprintf@plt>
ret

LLVM IR (-O0):
@stdout = global i32 0
@.str = [9 x i8] c"buffer: \00"
@.str.1 = [6 x i8] c"%02x \00"
@.str.2 = [2 x i8] c"\0A\00"
define void @dump_buffer(i8* %0, i64 %1) {
%3 = alloca i8*
%4 = alloca i64
%5 = alloca i64
store i8* %0, i8** %3
store i64 %1, i64* %4
%6 = load i64, i64* %4
%7 = icmp ule i64 %6, 0
br i1 %7, label %8, label %9
8: ; preds = %2
br label %30
9: ; preds = %2
%10 = load i32, i32* @stdout
%11 = call i32 (i32, i8*, ...) @fprintf(i32 %10, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0))
store i64 0, i64* %5
br label %12
12: ; preds = %24, %9
%13 = load i64, i64* %5
%14 = load i64, i64* %4
%15 = icmp ult i64 %13, %14
br i1 %15, label %16, label %27
16: ; preds = %12
%17 = load i32, i32* @stdout
%18 = load i8*, i8** %3
%19 = load i64, i64* %5
%20 = getelementptr inbounds i8, i8* %18, i64 %19
%21 = load i8, i8* %20
%22 = zext i8 %21 to i32
%23 = call i32 (i32, i8*, ...) @fprintf(i32 %17, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32 %22)
br label %24
24: ; preds = %16
%25 = load i64, i64* %5
%26 = add i64 %25, 1
store i64 %26, i64* %5
br label %12
27: ; preds = %12
%28 = load i32, i32* @stdout
%29 = call i32 (i32, i8*, ...) @fprintf(i32 %28, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %30
30: ; preds = %27, %8
ret void
}

LLVM IR (-O2):
@stdout = global i32 0
@.str = [9 x i8] c"buffer: \00"
@.str.1 = [6 x i8] c"%02x \00"
@.str.2 = [2 x i8] c"\0A\00"
define void @dump_buffer(i8* nocapture %0, i64 %1) {
%3 = icmp eq i64 %1, 0
br i1 %3, label %19, label %4
4: ; preds = %2
%5 = load i32, i32* @stdout
%6 = tail call i32 (i32, i8*, ...) @fprintf(i32 %5, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0))
br label %7
7: ; preds = %4, %7
%8 = phi i64 [ %14, %7 ], [ 0, %4 ]
%9 = load i32, i32* @stdout
%10 = getelementptr inbounds i8, i8* %0, i64 %8
%11 = load i8, i8* %10
%12 = zext i8 %11 to i32
%13 = tail call i32 (i32, i8*, ...) @fprintf(i32 %9, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32 %12)
%14 = add nuw i64 %8, 1
%15 = icmp eq i64 %14, %1
br i1 %15, label %16, label %7
16: ; preds = %7
%17 = load i32, i32* @stdout
%18 = tail call i32 (i32, i8*, ...) @fprintf(i32 %17, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %19
19: ; preds = %2, %16
ret void
}