#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*/ execvp(char *, char **);
int /*<<< orphan*/ printf(char *);
int main(int argc, char **argv) {
  char *args[3];
  args[0] = "/bin/echo";
  args[1] = "exec worked.";
  args[2] = NULL;
  printf("Running execvp...\n");
  execvp(args[0], args);
  printf("FAILED");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xec3(%rip),%rax
mov    %rax,-0x30(%rbp)
lea    0xec2(%rip),%rax
mov    %rax,-0x28(%rbp)
movq   $0x0,-0x20(%rbp)
lea    0xebc(%rip),%rdi
call   1030 <printf@plt>
mov    -0x30(%rbp),%rdi
lea    -0x30(%rbp),%rsi
call   1040 <execvp@plt>
lea    0xeb6(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x20,%rsp
lea    0xec4(%rip),%rbx
mov    %rbx,(%rsp)
lea    0xec3(%rip),%rax
mov    %rax,0x8(%rsp)
movq   $0x0,0x10(%rsp)
lea    0xec2(%rip),%rdi
call   1030 <puts@plt>
mov    %rsp,%rsi
mov    %rbx,%rdi
call   1050 <execvp@plt>
lea    0xea4(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [10 x i8] c"/bin/echo\00"
@.str.1 = [13 x i8] c"exec worked.\00"
@.str.2 = [19 x i8] c"Running execvp...\0A\00"
@.str.3 = [7 x i8] c"FAILED\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca [3 x i8*]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = getelementptr inbounds [3 x i8*], [3 x i8*]* %6, i64 0, i64 0
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8** %7
%8 = getelementptr inbounds [3 x i8*], [3 x i8*]* %6, i64 0, i64 1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8** %8
%9 = getelementptr inbounds [3 x i8*], [3 x i8*]* %6, i64 0, i64 2
store i8* null, i8** %9
%10 = call i32 @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%11 = getelementptr inbounds [3 x i8*], [3 x i8*]* %6, i64 0, i64 0
%12 = load i8*, i8** %11
%13 = getelementptr inbounds [3 x i8*], [3 x i8*]* %6, i64 0, i64 0
%14 = call i32 @execvp(i8* %12, i8** %13)
%15 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [10 x i8] c"/bin/echo\00"
@.str.1 = [13 x i8] c"exec worked.\00"
@.str.3 = [7 x i8] c"FAILED\00"
@str = [18 x i8] c"Running execvp...\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca [3 x i8*]
%4 = bitcast [3 x i8*]* %3 to i8*
%5 = getelementptr inbounds [3 x i8*], [3 x i8*]* %3, i64 0, i64 0
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8** %5
%6 = getelementptr inbounds [3 x i8*], [3 x i8*]* %3, i64 0, i64 1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8** %6
%7 = getelementptr inbounds [3 x i8*], [3 x i8*]* %3, i64 0, i64 2
store i8* null, i8** %7
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @str, i64 0, i64 0))
%9 = call i32 @execvp(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8** %5)
%10 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}