#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*/ O_RDONLY;
int /*<<< orphan*/ close(int);
int open(char *, int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, char *);
int /*<<< orphan*/ read(int, char *, int);
int main(int argc, char *argv[]) {
  int fd;
  char *myfifo = "/tmp/myfifo";
  char buf[1024];
  fd = open(myfifo, O_RDONLY);
  read(fd, buf, 1024);
  printf("Received: %s\n", buf);
  close(fd);
  return (0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x420,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xea0(%rip),%rax
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    0x2e79(%rip),%rax
mov    (%rax),%esi
call   1060 <open@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x420(%rbp),%rsi
mov    $0x400,%edx
call   1050 <read@plt>
lea    -0x420(%rbp),%rsi
lea    0xe71(%rip),%rdi
call   1030 <printf@plt>
mov    -0x14(%rbp),%edi
call   1040 <close@plt>
xor    %eax,%eax
add    $0x420,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x408,%rsp
mov    0x2e97(%rip),%rax
mov    (%rax),%esi
lea    0xea6(%rip),%rdi
call   1060 <open@plt>
mov    %eax,%ebx
mov    %rsp,%r14
mov    %eax,%edi
mov    %r14,%rsi
mov    $0x400,%edx
call   1050 <read@plt>
lea    0xe92(%rip),%rdi
mov    %r14,%rsi
call   1030 <printf@plt>
mov    %ebx,%edi
call   1040 <close@plt>
xor    %eax,%eax
add    $0x408,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [12 x i8] c"/tmp/myfifo\00"
@O_RDONLY = global i32 0
@.str.1 = [14 x i8] c"Received: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i8*
%8 = alloca [1024 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i8** %7
%9 = load i8*, i8** %7
%10 = load i32, i32* @O_RDONLY
%11 = call i32 @open(i8* %9, i32 %10)
store i32 %11, i32* %6
%12 = load i32, i32* %6
%13 = getelementptr inbounds [1024 x i8], [1024 x i8]* %8, i64 0, i64 0
%14 = call i32 @read(i32 %12, i8* %13, i32 1024)
%15 = getelementptr inbounds [1024 x i8], [1024 x i8]* %8, i64 0, i64 0
%16 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %15)
%17 = load i32, i32* %6
%18 = call i32 @close(i32 %17)
ret i32 0
}

LLVM IR (-O2):
@.str = [12 x i8] c"/tmp/myfifo\00"
@O_RDONLY = global i32 0
@.str.1 = [14 x i8] c"Received: %s\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca [1024 x i8]
%4 = getelementptr inbounds [1024 x i8], [1024 x i8]* %3, i64 0, i64 0
%5 = load i32, i32* @O_RDONLY
%6 = tail call i32 @open(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = call i32 @read(i32 %6, i8* %4, i32 1024)
%8 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %4)
%9 = call i32 @close(i32 %6)
ret i32 0
}