#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__ strncmp(char const *, char *, int);
int build_month_num(const char *Month) {
  int m_num = 1;
  if (0 == strncmp(Month, "Jan", 3)) {
    m_num = 1;
  } else if (0 == strncmp(Month, "Feb", 3)) {
    m_num = 2;
  } else if (0 == strncmp(Month, "Mar", 3)) {
    m_num = 3;
  } else if (0 == strncmp(Month, "Apr", 3)) {
    m_num = 4;
  } else if (0 == strncmp(Month, "May", 3)) {
    m_num = 5;
  } else if (0 == strncmp(Month, "Jun", 3)) {
    m_num = 6;
  } else if (0 == strncmp(Month, "Jul", 3)) {
    m_num = 7;
  } else if (0 == strncmp(Month, "Aug", 3)) {
    m_num = 8;
  } else if (0 == strncmp(Month, "Sep", 3)) {
    m_num = 9;
  } else if (0 == strncmp(Month, "Oct", 3)) {
    m_num = 10;
  } else if (0 == strncmp(Month, "Nov", 3)) {
    m_num = 11;
  } else if (0 == strncmp(Month, "Dec", 3)) {
    m_num = 12;
  }
  return m_num;
}


x86 assembly (clang, -O0):
<build_month_num>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
movl   $0x1,-0xc(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xed2(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    1152 <build_month_num+0x42>
movl   $0x1,-0xc(%rbp)
jmp    1389 <build_month_num+0x279>
mov    -0x8(%rbp),%rdi
lea    0xea7(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    1181 <build_month_num+0x71>
movl   $0x2,-0xc(%rbp)
jmp    1384 <build_month_num+0x274>
mov    -0x8(%rbp),%rdi
lea    0xe7c(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    11b0 <build_month_num+0xa0>
movl   $0x3,-0xc(%rbp)
jmp    137f <build_month_num+0x26f>
mov    -0x8(%rbp),%rdi
lea    0xe51(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    11df <build_month_num+0xcf>
movl   $0x4,-0xc(%rbp)
jmp    137a <build_month_num+0x26a>
mov    -0x8(%rbp),%rdi
lea    0xe26(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    120e <build_month_num+0xfe>
movl   $0x5,-0xc(%rbp)
jmp    1375 <build_month_num+0x265>
mov    -0x8(%rbp),%rdi
lea    0xdfb(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    123d <build_month_num+0x12d>
movl   $0x6,-0xc(%rbp)
jmp    1370 <build_month_num+0x260>
mov    -0x8(%rbp),%rdi
lea    0xdd0(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    126c <build_month_num+0x15c>
movl   $0x7,-0xc(%rbp)
jmp    136b <build_month_num+0x25b>
mov    -0x8(%rbp),%rdi
lea    0xda5(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    129b <build_month_num+0x18b>
movl   $0x8,-0xc(%rbp)
jmp    1366 <build_month_num+0x256>
mov    -0x8(%rbp),%rdi
lea    0xd7a(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    12ca <build_month_num+0x1ba>
movl   $0x9,-0xc(%rbp)
jmp    1361 <build_month_num+0x251>
mov    -0x8(%rbp),%rdi
lea    0xd4f(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    12f9 <build_month_num+0x1e9>
movl   $0xa,-0xc(%rbp)
jmp    135c <build_month_num+0x24c>
mov    -0x8(%rbp),%rdi
lea    0xd24(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    1328 <build_month_num+0x218>
movl   $0xb,-0xc(%rbp)
jmp    1357 <build_month_num+0x247>
mov    -0x8(%rbp),%rdi
lea    0xcf9(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
cmp    %rcx,%rax
jne    1352 <build_month_num+0x242>
movl   $0xc,-0xc(%rbp)
jmp    1357 <build_month_num+0x247>
jmp    135c <build_month_num+0x24c>
jmp    1361 <build_month_num+0x251>
jmp    1366 <build_month_num+0x256>
jmp    136b <build_month_num+0x25b>
jmp    1370 <build_month_num+0x260>
jmp    1375 <build_month_num+0x265>
jmp    137a <build_month_num+0x26a>
jmp    137f <build_month_num+0x26f>
jmp    1384 <build_month_num+0x274>
jmp    1389 <build_month_num+0x279>
mov    -0xc(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<build_month_num>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xee3(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1275 <build_month_num+0x165>
lea    0xecd(%rip),%rsi
mov    $0x3,%ebp
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     127c <build_month_num+0x16c>
lea    0xeaf(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     12b9 <build_month_num+0x1a9>
lea    0xe96(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1283 <build_month_num+0x173>
lea    0xe7d(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     128a <build_month_num+0x17a>
lea    0xe64(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1291 <build_month_num+0x181>
lea    0xe4b(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1298 <build_month_num+0x188>
lea    0xe32(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     129f <build_month_num+0x18f>
lea    0xe19(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     12a6 <build_month_num+0x196>
lea    0xe00(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     12ad <build_month_num+0x19d>
lea    0xdeb(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     12b4 <build_month_num+0x1a4>
lea    0xdd6(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
mov    $0xc,%eax
mov    $0x1,%ebp
cmove  %eax,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x1,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x2,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x4,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x5,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x6,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x7,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x8,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0x9,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0xa,%ebp
jmp    12b9 <build_month_num+0x1a9>
mov    $0xb,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [4 x i8] c"Jan\00"
@.str.1 = [4 x i8] c"Feb\00"
@.str.2 = [4 x i8] c"Mar\00"
@.str.3 = [4 x i8] c"Apr\00"
@.str.4 = [4 x i8] c"May\00"
@.str.5 = [4 x i8] c"Jun\00"
@.str.6 = [4 x i8] c"Jul\00"
@.str.7 = [4 x i8] c"Aug\00"
@.str.8 = [4 x i8] c"Sep\00"
@.str.9 = [4 x i8] c"Oct\00"
@.str.10 = [4 x i8] c"Nov\00"
@.str.11 = [4 x i8] c"Dec\00"
define i32 @build_month_num(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
store i8* %0, i8** %2
store i32 1, i32* %3
%4 = load i8*, i8** %2
%5 = call i64 @strncmp(i8* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
%6 = icmp eq i64 0, %5
br i1 %6, label %7, label %8
7: ; preds = %1
store i32 1, i32* %3
br label %74
8: ; preds = %1
%9 = load i8*, i8** %2
%10 = call i64 @strncmp(i8* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 3)
%11 = icmp eq i64 0, %10
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 2, i32* %3
br label %73
13: ; preds = %8
%14 = load i8*, i8** %2
%15 = call i64 @strncmp(i8* %14, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 3)
%16 = icmp eq i64 0, %15
br i1 %16, label %17, label %18
17: ; preds = %13
store i32 3, i32* %3
br label %72
18: ; preds = %13
%19 = load i8*, i8** %2
%20 = call i64 @strncmp(i8* %19, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 3)
%21 = icmp eq i64 0, %20
br i1 %21, label %22, label %23
22: ; preds = %18
store i32 4, i32* %3
br label %71
23: ; preds = %18
%24 = load i8*, i8** %2
%25 = call i64 @strncmp(i8* %24, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 3)
%26 = icmp eq i64 0, %25
br i1 %26, label %27, label %28
27: ; preds = %23
store i32 5, i32* %3
br label %70
28: ; preds = %23
%29 = load i8*, i8** %2
%30 = call i64 @strncmp(i8* %29, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i32 3)
%31 = icmp eq i64 0, %30
br i1 %31, label %32, label %33
32: ; preds = %28
store i32 6, i32* %3
br label %69
33: ; preds = %28
%34 = load i8*, i8** %2
%35 = call i64 @strncmp(i8* %34, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i32 3)
%36 = icmp eq i64 0, %35
br i1 %36, label %37, label %38
37: ; preds = %33
store i32 7, i32* %3
br label %68
38: ; preds = %33
%39 = load i8*, i8** %2
%40 = call i64 @strncmp(i8* %39, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i32 3)
%41 = icmp eq i64 0, %40
br i1 %41, label %42, label %43
42: ; preds = %38
store i32 8, i32* %3
br label %67
43: ; preds = %38
%44 = load i8*, i8** %2
%45 = call i64 @strncmp(i8* %44, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i32 3)
%46 = icmp eq i64 0, %45
br i1 %46, label %47, label %48
47: ; preds = %43
store i32 9, i32* %3
br label %66
48: ; preds = %43
%49 = load i8*, i8** %2
%50 = call i64 @strncmp(i8* %49, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i32 3)
%51 = icmp eq i64 0, %50
br i1 %51, label %52, label %53
52: ; preds = %48
store i32 10, i32* %3
br label %65
53: ; preds = %48
%54 = load i8*, i8** %2
%55 = call i64 @strncmp(i8* %54, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.10, i64 0, i64 0), i32 3)
%56 = icmp eq i64 0, %55
br i1 %56, label %57, label %58
57: ; preds = %53
store i32 11, i32* %3
br label %64
58: ; preds = %53
%59 = load i8*, i8** %2
%60 = call i64 @strncmp(i8* %59, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), i32 3)
%61 = icmp eq i64 0, %60
br i1 %61, label %62, label %63
62: ; preds = %58
store i32 12, i32* %3
br label %63
63: ; preds = %62, %58
br label %64
64: ; preds = %63, %57
br label %65
65: ; preds = %64, %52
br label %66
66: ; preds = %65, %47
br label %67
67: ; preds = %66, %42
br label %68
68: ; preds = %67, %37
br label %69
69: ; preds = %68, %32
br label %70
70: ; preds = %69, %27
br label %71
71: ; preds = %70, %22
br label %72
72: ; preds = %71, %17
br label %73
73: ; preds = %72, %12
br label %74
74: ; preds = %73, %7
%75 = load i32, i32* %3
ret i32 %75
}

LLVM IR (-O2):
@.str = [4 x i8] c"Jan\00"
@.str.1 = [4 x i8] c"Feb\00"
@.str.2 = [4 x i8] c"Mar\00"
@.str.3 = [4 x i8] c"Apr\00"
@.str.4 = [4 x i8] c"May\00"
@.str.5 = [4 x i8] c"Jun\00"
@.str.6 = [4 x i8] c"Jul\00"
@.str.7 = [4 x i8] c"Aug\00"
@.str.8 = [4 x i8] c"Sep\00"
@.str.9 = [4 x i8] c"Oct\00"
@.str.10 = [4 x i8] c"Nov\00"
@.str.11 = [4 x i8] c"Dec\00"
define i32 @build_month_num(i8* %0) {
%2 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
%3 = icmp eq i64 %2, 0
br i1 %3, label %38, label %4
4: ; preds = %1
%5 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 3)
%6 = icmp eq i64 %5, 0
br i1 %6, label %38, label %7
7: ; preds = %4
%8 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 3)
%9 = icmp eq i64 %8, 0
br i1 %9, label %38, label %10
10: ; preds = %7
%11 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 3)
%12 = icmp eq i64 %11, 0
br i1 %12, label %38, label %13
13: ; preds = %10
%14 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 3)
%15 = icmp eq i64 %14, 0
br i1 %15, label %38, label %16
16: ; preds = %13
%17 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i32 3)
%18 = icmp eq i64 %17, 0
br i1 %18, label %38, label %19
19: ; preds = %16
%20 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i32 3)
%21 = icmp eq i64 %20, 0
br i1 %21, label %38, label %22
22: ; preds = %19
%23 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i32 3)
%24 = icmp eq i64 %23, 0
br i1 %24, label %38, label %25
25: ; preds = %22
%26 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.8, i64 0, i64 0), i32 3)
%27 = icmp eq i64 %26, 0
br i1 %27, label %38, label %28
28: ; preds = %25
%29 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.9, i64 0, i64 0), i32 3)
%30 = icmp eq i64 %29, 0
br i1 %30, label %38, label %31
31: ; preds = %28
%32 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.10, i64 0, i64 0), i32 3)
%33 = icmp eq i64 %32, 0
br i1 %33, label %38, label %34
34: ; preds = %31
%35 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.11, i64 0, i64 0), i32 3)
%36 = icmp eq i64 %35, 0
%37 = select i1 %36, i32 12, i32 1
br label %38
38: ; preds = %34, %31, %28, %25, %22, %19, %16, %13, %10, %7, %4, %1
%39 = phi i32 [ 1, %1 ], [ 2, %4 ], [ 3, %7 ], [ 4, %10 ], [ 5, %13 ], [ 6, %16 ], [ 7, %19 ], [ 8, %22 ], [ 9, %25 ], [ 10, %28 ], [ 11, %31 ], [ %37, %34 ]
ret i32 %39
}