#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*/ assert(int);
int read(int, char *, size_t);
int read_all(int fd, char *buf, size_t count) {
  int bytes_read;
  while (count > 0) {
    bytes_read = read(fd, buf, count);
    assert(bytes_read > 0);
    buf += bytes_read;
    count -= bytes_read;
  }
  assert(count == 0);
  return 0;
}


x86 assembly (clang, -O0):
<read_all>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jbe    1187 <read_all+0x67>
mov    -0x4(%rbp),%edi
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
call   1030 <read@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0x0,-0x1c(%rbp)
setg   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
mov    -0x1c(%rbp),%ecx
mov    -0x10(%rbp),%rax
movslq %ecx,%rcx
add    %rcx,%rax
mov    %rax,-0x10(%rbp)
movslq -0x1c(%rbp),%rcx
mov    -0x18(%rbp),%rax
sub    %rcx,%rax
mov    %rax,-0x18(%rbp)
jmp    1133 <read_all+0x13>
cmpq   $0x0,-0x18(%rbp)
sete   %al
and    $0x1,%al
movzbl %al,%edi
call   1040 <assert@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_all>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
test   %rdx,%rdx
je     1168 <read_all+0x48>
mov    %rdx,%r14
mov    %rsi,%rbx
mov    %edi,%r15d
cs nopw 0x0(%rax,%rax,1)
nop
mov    %r15d,%edi
mov    %rbx,%rsi
mov    %r14,%rdx
call   1030 <read@plt>
mov    %eax,%ebp
xor    %edi,%edi
test   %eax,%eax
setg   %dil
call   1040 <assert@plt>
movslq %ebp,%rax
add    %rax,%rbx
sub    %rax,%r14
jne    1140 <read_all+0x20>
mov    $0x1,%edi
call   1040 <assert@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i32 @read_all(i32 %0, i8* %1, i64 %2) {
%4 = alloca i32
%5 = alloca i8*
%6 = alloca i64
%7 = alloca i32
store i32 %0, i32* %4
store i8* %1, i8** %5
store i64 %2, i64* %6
br label %8
8: ; preds = %11, %3
%9 = load i64, i64* %6
%10 = icmp ugt i64 %9, 0
br i1 %10, label %11, label %28
11: ; preds = %8
%12 = load i32, i32* %4
%13 = load i8*, i8** %5
%14 = load i64, i64* %6
%15 = call i32 @read(i32 %12, i8* %13, i64 %14)
store i32 %15, i32* %7
%16 = load i32, i32* %7
%17 = icmp sgt i32 %16, 0
%18 = zext i1 %17 to i32
%19 = call i32 @assert(i32 %18)
%20 = load i32, i32* %7
%21 = load i8*, i8** %5
%22 = sext i32 %20 to i64
%23 = getelementptr inbounds i8, i8* %21, i64 %22
store i8* %23, i8** %5
%24 = load i32, i32* %7
%25 = sext i32 %24 to i64
%26 = load i64, i64* %6
%27 = sub i64 %26, %25
store i64 %27, i64* %6
br label %8
28: ; preds = %8
%29 = load i64, i64* %6
%30 = icmp eq i64 %29, 0
%31 = zext i1 %30 to i32
%32 = call i32 @assert(i32 %31)
ret i32 0
}

LLVM IR (-O2):
define i32 @read_all(i32 %0, i8* nocapture %1, i64 %2) {
%4 = icmp eq i64 %2, 0
br i1 %4, label %16, label %5
5: ; preds = %3, %5
%6 = phi i8* [ %13, %5 ], [ %1, %3 ]
%7 = phi i64 [ %14, %5 ], [ %2, %3 ]
%8 = tail call i32 @read(i32 %0, i8* %6, i64 %7)
%9 = icmp sgt i32 %8, 0
%10 = zext i1 %9 to i32
%11 = tail call i32 @assert(i32 %10)
%12 = sext i32 %8 to i64
%13 = getelementptr inbounds i8, i8* %6, i64 %12
%14 = sub i64 %7, %12
%15 = icmp eq i64 %14, 0
br i1 %15, label %16, label %5
16: ; preds = %5, %3
%17 = tail call i32 @assert(i32 1)
ret i32 0
}