#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 read(int, char *, int);
int m_socket_read(int fd, char *ptr, int totalsize) {
  int size, ret;
  size = 0;
  while (size < totalsize) {
    if ((ret = read(fd, &ptr[size], totalsize - size)) <= 0)
      return -1;
    size += ret;
  }
  return 0;
}


x86 assembly (clang, -O0):
<m_socket_read>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    1174 <m_socket_read+0x64>
mov    -0x8(%rbp),%edi
mov    -0x10(%rbp),%rsi
movslq -0x18(%rbp),%rax
add    %rax,%rsi
mov    -0x14(%rbp),%edx
sub    -0x18(%rbp),%edx
call   1030 <read@plt>
mov    %eax,-0x1c(%rbp)
cmp    $0x0,%eax
jg     1166 <m_socket_read+0x56>
movl   $0xffffffff,-0x4(%rbp)
jmp    117b <m_socket_read+0x6b>
mov    -0x1c(%rbp),%eax
add    -0x18(%rbp),%eax
mov    %eax,-0x18(%rbp)
jmp    1129 <m_socket_read+0x19>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<m_socket_read>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
test   %edx,%edx
jle    114d <m_socket_read+0x3d>
mov    %edx,%ebx
mov    %rsi,%r14
mov    %edi,%r15d
xor    %ebp,%ebp
cs nopw 0x0(%rax,%rax,1)
nop
movslq %ebp,%rax
lea    (%r14,%rax,1),%rsi
mov    %ebx,%edx
sub    %eax,%edx
mov    %r15d,%edi
call   1030 <read@plt>
test   %eax,%eax
jle    1151 <m_socket_read+0x41>
add    %eax,%ebp
cmp    %ebx,%ebp
jl     1130 <m_socket_read+0x20>
xor    %eax,%eax
jmp    1156 <m_socket_read+0x46>
mov    $0xffffffff,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

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

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