#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__ strcasecmp(char *, char const *);
const char *lookup(const char *extension) {
  if (strcasecmp("css", extension) == 0) {
    return "text/css";
  }
  if (strcasecmp("html", extension) == 0) {
    return "text/html";
  }
  if (strcasecmp("gif", extension) == 0) {
    return "image/gif";
  }
  if (strcasecmp("ico", extension) == 0) {
    return "image/x-icon";
  }
  if (strcasecmp("jpg", extension) == 0) {
    return "image/jpeg";
  }
  if (strcasecmp("js", extension) == 0) {
    return "text/javascript";
  }
  if (strcasecmp("png", extension) == 0) {
    return "image/png";
  }
  return NULL;
}


x86 assembly (clang, -O0):
<lookup>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rsi
lea    0xede(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    1146 <lookup+0x36>
lea    0xec3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
mov    -0x10(%rbp),%rsi
lea    0xebd(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    1170 <lookup+0x60>
lea    0xea2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
mov    -0x10(%rbp),%rsi
lea    0xe9e(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    119a <lookup+0x8a>
lea    0xe82(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
mov    -0x10(%rbp),%rsi
lea    0xe78(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    11c4 <lookup+0xb4>
lea    0xe66(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
mov    -0x10(%rbp),%rsi
lea    0xe5f(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    11ee <lookup+0xde>
lea    0xe4d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
mov    -0x10(%rbp),%rsi
lea    0xe44(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    1218 <lookup+0x108>
lea    0xe31(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
mov    -0x10(%rbp),%rsi
lea    0xe33(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    1242 <lookup+0x132>
lea    0xe17(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    124a <lookup+0x13a>
movq   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<lookup>:
push   %rbx
mov    %rdi,%rbx
lea    0xeea(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11b4 <lookup+0xa4>
lea    0xedb(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11bd <lookup+0xad>
lea    0xed2(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11c6 <lookup+0xb6>
lea    0xec2(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11cf <lookup+0xbf>
lea    0xebf(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11d8 <lookup+0xc8>
lea    0xeba(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11e1 <lookup+0xd1>
lea    0xebf(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
test   %rcx,%rcx
lea    0xea2(%rip),%rcx
cmove  %rcx,%rax
pop    %rbx
ret
lea    0xe45(%rip),%rax
pop    %rbx
ret
lea    0xe45(%rip),%rax
pop    %rbx
ret
lea    0xe46(%rip),%rax
pop    %rbx
ret
lea    0xe4b(%rip),%rax
pop    %rbx
ret
lea    0xe53(%rip),%rax
pop    %rbx
ret
lea    0xe58(%rip),%rax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"css\00"
@.str.1 = [9 x i8] c"text/css\00"
@.str.2 = [5 x i8] c"html\00"
@.str.3 = [10 x i8] c"text/html\00"
@.str.4 = [4 x i8] c"gif\00"
@.str.5 = [10 x i8] c"image/gif\00"
@.str.6 = [4 x i8] c"ico\00"
@.str.7 = [13 x i8] c"image/x-icon\00"
@.str.8 = [4 x i8] c"jpg\00"
@.str.9 = [11 x i8] c"image/jpeg\00"
@.str.10 = [3 x i8] c"js\00"
@.str.11 = [16 x i8] c"text/javascript\00"
@.str.12 = [4 x i8] c"png\00"
@.str.13 = [10 x i8] c"image/png\00"
define i8* @lookup(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* %4)
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %39
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @strcasecmp(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8* %9)
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %39
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8* %14)
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %39
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8* %19)
%21 = icmp eq i64 %20, 0
br i1 %21, label %22, label %23
22: ; preds = %18
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %39
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i8* %24)
%26 = icmp eq i64 %25, 0
br i1 %26, label %27, label %28
27: ; preds = %23
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %39
28: ; preds = %23
%29 = load i8*, i8** %3
%30 = call i64 @strcasecmp(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.10, i64 0, i64 0), i8* %29)
%31 = icmp eq i64 %30, 0
br i1 %31, label %32, label %33
32: ; preds = %28
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %39
33: ; preds = %28
%34 = load i8*, i8** %3
%35 = call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.12, i64 0, i64 0), i8* %34)
%36 = icmp eq i64 %35, 0
br i1 %36, label %37, label %38
37: ; preds = %33
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %39
38: ; preds = %33
store i8* null, i8** %2
br label %39
39: ; preds = %38, %37, %32, %27, %22, %17, %12, %7
%40 = load i8*, i8** %2
ret i8* %40
}

LLVM IR (-O2):
@.str = [4 x i8] c"css\00"
@.str.1 = [9 x i8] c"text/css\00"
@.str.2 = [5 x i8] c"html\00"
@.str.3 = [10 x i8] c"text/html\00"
@.str.4 = [4 x i8] c"gif\00"
@.str.5 = [10 x i8] c"image/gif\00"
@.str.6 = [4 x i8] c"ico\00"
@.str.7 = [13 x i8] c"image/x-icon\00"
@.str.8 = [4 x i8] c"jpg\00"
@.str.9 = [11 x i8] c"image/jpeg\00"
@.str.10 = [3 x i8] c"js\00"
@.str.11 = [16 x i8] c"text/javascript\00"
@.str.12 = [4 x i8] c"png\00"
@.str.13 = [10 x i8] c"image/png\00"
define i8* @lookup(i8* nocapture %0) {
%2 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* %0)
%3 = icmp eq i64 %2, 0
br i1 %3, label %23, label %4
4: ; preds = %1
%5 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8* %0)
%6 = icmp eq i64 %5, 0
br i1 %6, label %23, label %7
7: ; preds = %4
%8 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i8* %0)
%9 = icmp eq i64 %8, 0
br i1 %9, label %23, label %10
10: ; preds = %7
%11 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i8* %0)
%12 = icmp eq i64 %11, 0
br i1 %12, label %23, label %13
13: ; preds = %10
%14 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i8* %0)
%15 = icmp eq i64 %14, 0
br i1 %15, label %23, label %16
16: ; preds = %13
%17 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.10, i64 0, i64 0), i8* %0)
%18 = icmp eq i64 %17, 0
br i1 %18, label %23, label %19
19: ; preds = %16
%20 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.12, i64 0, i64 0), i8* %0)
%21 = icmp eq i64 %20, 0
%22 = select i1 %21, i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.13, i64 0, i64 0), i8* null
br label %23
23: ; preds = %19, %16, %13, %10, %7, %4, %1
%24 = phi i8* [ getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), %1 ], [ getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), %4 ], [ getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), %7 ], [ getelementptr inbounds ([13 x i8], [13 x i8]* @.str.7, i64 0, i64 0), %10 ], [ getelementptr inbounds ([11 x i8], [11 x i8]* @.str.9, i64 0, i64 0), %13 ], [ getelementptr inbounds ([16 x i8], [16 x i8]* @.str.11, i64 0, i64 0), %16 ], [ %22, %19 ]
ret i8* %24
}