#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 *, ...);
int echo(int argc, char **argv) {
  int i;
  for (i = 1; i < argc; i++) {
    printf("%s", argv[i]);
    if (i < (argc - 1))
      printf(" ");
  }
  printf("\n");
  return 0;
}


x86 assembly (clang, -O0):
<echo>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x1,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    117e <echo+0x6e>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rsi
lea    0xebb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
mov    -0x4(%rbp),%ecx
sub    $0x1,%ecx
cmp    %ecx,%eax
jge    116b <echo+0x5b>
lea    0xe9f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    1170 <echo+0x60>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1126 <echo+0x16>
lea    0xe80(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<echo>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
cmp    $0x2,%edi
jl     1178 <echo+0x58>
mov    %rsi,%r15
lea    -0x1(%rdi),%r12d
mov    %edi,%r13d
mov    $0x1,%ebx
lea    0xebc(%rip),%r14
jmp    1159 <echo+0x39>
cs nopw 0x0(%rax,%rax,1)
add    $0x1,%rbx
cmp    %rbx,%r13
je     1178 <echo+0x58>
mov    (%r15,%rbx,8),%rsi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
cmp    %r12,%rbx
jae    1150 <echo+0x30>
mov    $0x20,%edi
call   1030 <putchar@plt>
jmp    1150 <echo+0x30>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
@.str = [3 x i8] c"%s\00"
define i32 @echo(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 1
br i1 %3, label %4, label %19
4: ; preds = %2
%5 = add nsw i32 %0, -1
%6 = zext i32 %5 to i64
%7 = zext i32 %0 to i64
br label %8
8: ; preds = %4, %16
%9 = phi i64 [ 1, %4 ], [ %17, %16 ]
%10 = getelementptr inbounds i8*, i8** %1, i64 %9
%11 = load i8*, i8** %10
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8* %11)
%13 = icmp ult i64 %9, %6
br i1 %13, label %14, label %16
14: ; preds = %8
%15 = tail call i32 @putchar(i32 32)
br label %16
16: ; preds = %8, %14
%17 = add nuw nsw i64 %9, 1
%18 = icmp eq i64 %17, %7
br i1 %18, label %19, label %8
19: ; preds = %16, %2
%20 = tail call i32 @putchar(i32 10)
ret i32 0
}