#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 */
scalar_t__ malloc(int);
int /*<<< orphan*/ strcpy(char *, char *);
int strlen(char const *);
char tolower(char const);
char *strtolower(const char *c) {
  int size = strlen(c);
  char *re = (char *)malloc(sizeof(char) * (size + 1));
  strcpy(re, "\0");
  int i;
  for (i = 0; i < size; i++) {
    re[i] = tolower(c[i]);
  }
  re[size] = '\0';
  return re;
}


x86 assembly (clang, -O0):
<strtolower>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0x1,%eax
cltq
shl    $0x0,%rax
mov    %eax,%edi
call   1060 <malloc@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
lea    0xe86(%rip),%rsi
call   1030 <strcpy@plt>
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    11be <strtolower+0x7e>
mov    -0x8(%rbp),%rax
movslq -0x1c(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1050 <tolower@plt>
mov    %al,%dl
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
mov    %dl,(%rax,%rcx,1)
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    1186 <strtolower+0x46>
mov    -0x18(%rbp),%rax
movslq -0xc(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<strtolower>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
mov    %rdi,%r15
call   1040 <strlen@plt>
mov    %eax,%r14d
lea    0x1(%r14),%edi
call   1060 <malloc@plt>
mov    %rax,%r12
lea    0xe99(%rip),%rsi
mov    %rax,%rdi
call   1030 <strcpy@plt>
test   %r14d,%r14d
jle    1197 <strtolower+0x57>
mov    %r14d,%r13d
xor    %ebx,%ebx
nopl   0x0(%rax)
movsbl (%r15,%rbx,1),%edi
call   1050 <tolower@plt>
mov    %al,(%r12,%rbx,1)
add    $0x1,%rbx
cmp    %rbx,%r13
jne    1180 <strtolower+0x40>
movslq %r14d,%rax
movb   $0x0,(%r12,%rax,1)
mov    %r12,%rax
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] zeroinitializer
define i8* @strtolower(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca i8*
%5 = alloca i32
store i8* %0, i8** %2
%6 = load i8*, i8** %2
%7 = call i32 @strlen(i8* %6)
store i32 %7, i32* %3
%8 = load i32, i32* %3
%9 = add nsw i32 %8, 1
%10 = sext i32 %9 to i64
%11 = mul i64 1, %10
%12 = trunc i64 %11 to i32
%13 = call i64 @malloc(i32 %12)
%14 = inttoptr i64 %13 to i8*
store i8* %14, i8** %4
%15 = load i8*, i8** %4
%16 = call i32 @strcpy(i8* %15, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %5
br label %17
17: ; preds = %32, %1
%18 = load i32, i32* %5
%19 = load i32, i32* %3
%20 = icmp slt i32 %18, %19
br i1 %20, label %21, label %35
21: ; preds = %17
%22 = load i8*, i8** %2
%23 = load i32, i32* %5
%24 = sext i32 %23 to i64
%25 = getelementptr inbounds i8, i8* %22, i64 %24
%26 = load i8, i8* %25
%27 = call signext i8 @tolower(i8 signext %26)
%28 = load i8*, i8** %4
%29 = load i32, i32* %5
%30 = sext i32 %29 to i64
%31 = getelementptr inbounds i8, i8* %28, i64 %30
store i8 %27, i8* %31
br label %32
32: ; preds = %21
%33 = load i32, i32* %5
%34 = add nsw i32 %33, 1
store i32 %34, i32* %5
br label %17
35: ; preds = %17
%36 = load i8*, i8** %4
%37 = load i32, i32* %3
%38 = sext i32 %37 to i64
%39 = getelementptr inbounds i8, i8* %36, i64 %38
store i8 0, i8* %39
%40 = load i8*, i8** %4
ret i8* %40
}

LLVM IR (-O2):
@.str = [2 x i8] zeroinitializer
define i8* @strtolower(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = add nsw i32 %2, 1
%4 = tail call i64 @malloc(i32 %3)
%5 = inttoptr i64 %4 to i8*
%6 = tail call i32 @strcpy(i8* %5, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%7 = icmp sgt i32 %2, 0
br i1 %7, label %8, label %18
8: ; preds = %1
%9 = zext i32 %2 to i64
br label %10
10: ; preds = %8, %10
%11 = phi i64 [ 0, %8 ], [ %16, %10 ]
%12 = getelementptr inbounds i8, i8* %0, i64 %11
%13 = load i8, i8* %12
%14 = tail call signext i8 @tolower(i8 signext %13)
%15 = getelementptr inbounds i8, i8* %5, i64 %11
store i8 %14, i8* %15
%16 = add nuw nsw i64 %11, 1
%17 = icmp eq i64 %16, %9
br i1 %17, label %18, label %10
18: ; preds = %10, %1
%19 = sext i32 %2 to i64
%20 = getelementptr inbounds i8, i8* %5, i64 %19
store i8 0, i8* %20
ret i8* %5
}