#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 isBitiSet(unsigned char, int);
int /*<<< orphan*/ printf(char *, ...);
void printByte(unsigned char byte) {
  int i;
  for (i = 7; i >= 0; i--)
    printf("%d", isBitiSet(byte, i));
  printf("\n");
}


x86 assembly (clang, -O0):
<printByte>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %dil,%al
mov    %al,-0x1(%rbp)
movl   $0x7,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jl     116b <printByte+0x4b>
mov    -0x1(%rbp),%al
mov    -0x8(%rbp),%esi
movzbl %al,%edi
call   1040 <isBitiSet@plt>
mov    %eax,%esi
lea    0xeaa(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x8(%rbp)
jmp    1135 <printByte+0x15>
lea    0xe91(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<printByte>:
push   %r14
push   %rbx
push   %rax
mov    %edi,%ebx
mov    $0x7,%esi
call   1050 <isBitiSet@plt>
lea    0xeb9(%rip),%r14
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
mov    $0x6,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
mov    $0x5,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
mov    $0x4,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
mov    $0x3,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
mov    $0x2,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
mov    $0x1,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %ebx,%edi
xor    %esi,%esi
call   1050 <isBitiSet@plt>
mov    %r14,%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r14
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [2 x i8] c"\0A\00"
define void @printByte(i8 zeroext %0) {
%2 = alloca i8
%3 = alloca i32
store i8 %0, i8* %2
store i32 7, i32* %3
br label %4
4: ; preds = %12, %1
%5 = load i32, i32* %3
%6 = icmp sge i32 %5, 0
br i1 %6, label %7, label %15
7: ; preds = %4
%8 = load i8, i8* %2
%9 = load i32, i32* %3
%10 = call i32 @isBitiSet(i8 zeroext %8, i32 %9)
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %10)
br label %12
12: ; preds = %7
%13 = load i32, i32* %3
%14 = add nsw i32 %13, -1
store i32 %14, i32* %3
br label %4
15: ; preds = %4
%16 = 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 = [3 x i8] c"%d\00"
define void @printByte(i8 zeroext %0) {
%2 = tail call i32 @isBitiSet(i8 zeroext %0, i32 7)
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %2)
%4 = tail call i32 @isBitiSet(i8 zeroext %0, i32 6)
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %4)
%6 = tail call i32 @isBitiSet(i8 zeroext %0, i32 5)
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %6)
%8 = tail call i32 @isBitiSet(i8 zeroext %0, i32 4)
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %8)
%10 = tail call i32 @isBitiSet(i8 zeroext %0, i32 3)
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %10)
%12 = tail call i32 @isBitiSet(i8 zeroext %0, i32 2)
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %12)
%14 = tail call i32 @isBitiSet(i8 zeroext %0, i32 1)
%15 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %14)
%16 = tail call i32 @isBitiSet(i8 zeroext %0, i32 0)
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %16)
%18 = tail call i32 @putchar(i32 10)
ret void
}