#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 scalar_t__ ssize_t;

/* Variables and functions */
scalar_t__ EINTR;
int /*<<< orphan*/ eprintf(char *);
scalar_t__ errno;
scalar_t__ read(int, void *, size_t);
ssize_t eread(int fd, void *buf, size_t n) {
  ssize_t r;
again:
  r = read(fd, buf, n);
  if (r < 0) {
    if (errno == EINTR)
      goto again;
    eprintf("read:");
  }
  return r;
}


x86 assembly (clang, -O0):
<eread>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
mov    -0x4(%rbp),%edi
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
call   1030 <read@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jge    117d <eread+0x5d>
mov    0x2e87(%rip),%rax
mov    (%rax),%rax
mov    0x2e75(%rip),%rcx
cmp    (%rcx),%rax
jne    1171 <eread+0x51>
jmp    1133 <eread+0x13>
lea    0xe88(%rip),%rdi
call   1040 <eprintf@plt>
mov    -0x20(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<eread>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
mov    %rdx,%r14
mov    %rsi,%r15
mov    %edi,%ebp
mov    0x2ea6(%rip),%r12
mov    0x2e97(%rip),%r13
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
mov    %ebp,%edi
mov    %r15,%rsi
mov    %r14,%rdx
call   1030 <read@plt>
mov    %rax,%rbx
test   %rax,%rax
jns    117b <eread+0x5b>
mov    (%r12),%rax
cmp    0x0(%r13),%rax
je     1150 <eread+0x30>
lea    0xe8a(%rip),%rdi
call   1040 <eprintf@plt>
mov    %rbx,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@errno = global i64 0
@EINTR = global i64 0
@.str = [6 x i8] c"read:\00"
define i64 @eread(i32 %0, i8* %1, i64 %2) {
%4 = alloca i32
%5 = alloca i8*
%6 = alloca i64
%7 = alloca i64
store i32 %0, i32* %4
store i8* %1, i8** %5
store i64 %2, i64* %6
br label %8
8: ; preds = %19, %3
%9 = load i32, i32* %4
%10 = load i8*, i8** %5
%11 = load i64, i64* %6
%12 = call i64 @read(i32 %9, i8* %10, i64 %11)
store i64 %12, i64* %7
%13 = load i64, i64* %7
%14 = icmp slt i64 %13, 0
br i1 %14, label %15, label %22
15: ; preds = %8
%16 = load i64, i64* @errno
%17 = load i64, i64* @EINTR
%18 = icmp eq i64 %16, %17
br i1 %18, label %19, label %20
19: ; preds = %15
br label %8
20: ; preds = %15
%21 = call i32 @eprintf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
br label %22
22: ; preds = %20, %8
%23 = load i64, i64* %7
ret i64 %23
}

LLVM IR (-O2):
@errno = global i64 0
@EINTR = global i64 0
@.str = [6 x i8] c"read:\00"
define i64 @eread(i32 %0, i8* nocapture %1, i64 %2) {
br label %4
4: ; preds = %7, %3
%5 = tail call i64 @read(i32 %0, i8* %1, i64 %2)
%6 = icmp slt i64 %5, 0
br i1 %6, label %7, label %13
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
%12 = tail call i32 @eprintf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
br label %13
13: ; preds = %4, %11
ret i64 %5
}