#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*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int hex2integer(char *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ stderr;
int main(int argc, char **argv) {
  if (argc < 2) {
    fprintf(stderr, "Usage: %s hex\n", argv[0]);
    exit(1);
  }
  while (--argc)
    printf("%c", hex2integer(*++argv));
  printf("\n");
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jge    1186 <main+0x46>
mov    0x2e79(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe89(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
jmp    118b <main+0x4b>
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x8(%rbp)
cmp    $0x0,%eax
je     11ca <main+0x8a>
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
mov    0x8(%rax),%rdi
call   1030 <hex2integer@plt>
mov    %eax,%esi
lea    0xe51(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    118b <main+0x4b>
lea    0xe3c(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
cmp    $0x2,%edi
jl     118b <main+0x4b>
mov    %edi,%r15d
mov    $0x1,%ebx
cs nopw 0x0(%rax,%rax,1)
nop
mov    (%r14,%rbx,8),%rdi
call   1040 <hex2integer@plt>
mov    %eax,%edi
call   1030 <putchar@plt>
add    $0x1,%rbx
cmp    %ebx,%r15d
jne    1160 <main+0x20>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %r15
ret
mov    0x2e4e(%rip),%rax
mov    (%rax),%edi
mov    (%r14),%rdx
lea    0xe62(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [15 x i8] c"Usage: %s hex\0A\00"
@.str.1 = [3 x i8] c"%c\00"
@.str.2 = [2 x i8] c"\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp slt i32 %6, 2
br i1 %7, label %8, label %15
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 0
%12 = load i8*, i8** %11
%13 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %12)
%14 = call i32 @exit(i32 1)
unreachable
15: ; preds = %2
br label %16
16: ; preds = %20, %15
%17 = load i32, i32* %4
%18 = add nsw i32 %17, -1
store i32 %18, i32* %4
%19 = icmp ne i32 %18, 0
br i1 %19, label %20, label %26
20: ; preds = %16
%21 = load i8**, i8*** %5
%22 = getelementptr inbounds i8*, i8** %21, i32 1
store i8** %22, i8*** %5
%23 = load i8*, i8** %22
%24 = call i32 @hex2integer(i8* %23)
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %24)
br label %16
26: ; preds = %16
%27 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%28 = load i32, i32* %3
ret i32 %28
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [15 x i8] c"Usage: %s hex\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %6, label %4
4: ; preds = %2
%5 = add nsw i32 %0, -1
br label %11
6: ; preds = %2
%7 = load i32, i32* @stderr
%8 = load i8*, i8** %1
%9 = tail call i32 @fprintf(i32 %7, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %8)
%10 = tail call i32 @exit(i32 1)
unreachable
11: ; preds = %4, %11
%12 = phi i32 [ %18, %11 ], [ %5, %4 ]
%13 = phi i8** [ %14, %11 ], [ %1, %4 ]
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
%16 = tail call i32 @hex2integer(i8* %15)
%17 = tail call i32 @putchar(i32 %16)
%18 = add nsw i32 %12, -1
%19 = icmp eq i32 %18, 0
br i1 %19, label %20, label %11
20: ; preds = %11
%21 = tail call i32 @putchar(i32 10)
ret i32 0
}