#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 */
typedef int ssize_t;

/* Variables and functions */
scalar_t__ EINTR;
scalar_t__ errno;
int recv(int, void *, size_t, int /*<<< orphan*/);
ssize_t data_read(int fd, void *buf, size_t len) {
  ssize_t n;
  for (;;) {
    n = recv(fd, buf, len, 0);
    if (n == -1) {
      if (errno == EINTR)
        continue;
      break;
    }
    return n;
  }
  return n;
}


x86 assembly (clang, -O0):
<data_read>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
mov    -0x8(%rbp),%edi
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
xor    %ecx,%ecx
call   1030 <recv@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0xffffffff,-0x1c(%rbp)
jne    1166 <data_read+0x56>
mov    0x2e97(%rip),%rax
mov    (%rax),%rax
mov    0x2e85(%rip),%rcx
cmp    (%rcx),%rax
jne    1161 <data_read+0x51>
jmp    1123 <data_read+0x13>
jmp    1171 <data_read+0x61>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    1177 <data_read+0x67>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<data_read>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %rdx,%r14
mov    %rsi,%rbx
mov    %edi,%ebp
mov    0x2eb9(%rip),%r15
mov    0x2eaa(%rip),%r12
xchg   %ax,%ax
mov    %ebp,%edi
mov    %rbx,%rsi
mov    %r14,%rdx
xor    %ecx,%ecx
call   1030 <recv@plt>
cmp    $0xffffffff,%eax
jne    114d <data_read+0x3d>
mov    (%r15),%rcx
cmp    (%r12),%rcx
je     1130 <data_read+0x20>
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@errno = global i64 0
@EINTR = global i64 0
define i32 @data_read(i32 %0, i8* %1, i64 %2) {
%4 = alloca i32
%5 = alloca i32
%6 = alloca i8*
%7 = alloca i64
%8 = alloca i32
store i32 %0, i32* %5
store i8* %1, i8** %6
store i64 %2, i64* %7
br label %9
9: ; preds = %20, %3
%10 = load i32, i32* %5
%11 = load i8*, i8** %6
%12 = load i64, i64* %7
%13 = call i32 @recv(i32 %10, i8* %11, i64 %12, i32 0)
store i32 %13, i32* %8
%14 = load i32, i32* %8
%15 = icmp eq i32 %14, -1
br i1 %15, label %16, label %22
16: ; preds = %9
%17 = load i64, i64* @errno
%18 = load i64, i64* @EINTR
%19 = icmp eq i64 %17, %18
br i1 %19, label %20, label %21
20: ; preds = %16
br label %9
21: ; preds = %16
br label %24
22: ; preds = %9
%23 = load i32, i32* %8
store i32 %23, i32* %4
br label %26
24: ; preds = %21
%25 = load i32, i32* %8
store i32 %25, i32* %4
br label %26
26: ; preds = %24, %22
%27 = load i32, i32* %4
ret i32 %27
}

LLVM IR (-O2):
@errno = global i64 0
@EINTR = global i64 0
define i32 @data_read(i32 %0, i8* %1, i64 %2) {
br label %4
4: ; preds = %7, %3
%5 = tail call i32 @recv(i32 %0, i8* %1, i64 %2, i32 0)
%6 = icmp eq i32 %5, -1
br i1 %6, label %7, label %11
7: ; preds = %4
%8 = load i64, i64* @errno
%9 = load i64, i64* @EINTR
%10 = icmp eq i64 %8, %9
br i1 %10, label %4, label %11
11: ; preds = %7, %4
ret i32 %5
}