#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__ strncasecmp(char *, char *, int);
int find_wkday(char *d) {
  if (strncasecmp(d, "Mon", 3) == 0)
    return 1;
  else if (strncasecmp(d, "Tue", 3) == 0)
    return 2;
  else if (strncasecmp(d, "Wed", 3) == 0)
    return 3;
  else if (strncasecmp(d, "Thu", 3) == 0)
    return 4;
  else if (strncasecmp(d, "Fri", 3) == 0)
    return 5;
  else if (strncasecmp(d, "Sat", 3) == 0)
    return 6;
  else if (strncasecmp(d, "Sun", 3) == 0)
    return 0;
  return -1;
}


x86 assembly (clang, -O0):
<find_wkday>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xed9(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    1147 <find_wkday+0x37>
movl   $0x1,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
mov    -0x10(%rbp),%rdi
lea    0xeb2(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    1172 <find_wkday+0x62>
movl   $0x2,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
mov    -0x10(%rbp),%rdi
lea    0xe8b(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    119d <find_wkday+0x8d>
movl   $0x3,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
mov    -0x10(%rbp),%rdi
lea    0xe64(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    11c8 <find_wkday+0xb8>
movl   $0x4,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
mov    -0x10(%rbp),%rdi
lea    0xe3d(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    11f3 <find_wkday+0xe3>
movl   $0x5,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
mov    -0x10(%rbp),%rdi
lea    0xe16(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    121e <find_wkday+0x10e>
movl   $0x6,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
mov    -0x10(%rbp),%rdi
lea    0xdef(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
cmp    $0x0,%rax
jne    1249 <find_wkday+0x139>
movl   $0x0,-0x4(%rbp)
jmp    126e <find_wkday+0x15e>
jmp    124e <find_wkday+0x13e>
jmp    1253 <find_wkday+0x143>
jmp    1258 <find_wkday+0x148>
jmp    125d <find_wkday+0x14d>
jmp    1262 <find_wkday+0x152>
jmp    1267 <find_wkday+0x157>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<find_wkday>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xee3(%rip),%rsi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
test   %rax,%rax
je     11d5 <find_wkday+0xc5>
lea    0xecd(%rip),%rsi
mov    $0x3,%ebp
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
test   %rax,%rax
je     11dc <find_wkday+0xcc>
lea    0xeaf(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
test   %rax,%rax
je     11f6 <find_wkday+0xe6>
lea    0xe96(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
test   %rax,%rax
je     11e3 <find_wkday+0xd3>
lea    0xe81(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
test   %rax,%rax
je     11ea <find_wkday+0xda>
lea    0xe6c(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
test   %rax,%rax
je     11f1 <find_wkday+0xe1>
lea    0xe57(%rip),%rsi
mov    %rbx,%rdi
mov    $0x3,%edx
call   1030 <strncasecmp@plt>
neg    %rax
sbb    %ebp,%ebp
jmp    11f6 <find_wkday+0xe6>
mov    $0x1,%ebp
jmp    11f6 <find_wkday+0xe6>
mov    $0x2,%ebp
jmp    11f6 <find_wkday+0xe6>
mov    $0x4,%ebp
jmp    11f6 <find_wkday+0xe6>
mov    $0x5,%ebp
jmp    11f6 <find_wkday+0xe6>
mov    $0x6,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [4 x i8] c"Mon\00"
@.str.1 = [4 x i8] c"Tue\00"
@.str.2 = [4 x i8] c"Wed\00"
@.str.3 = [4 x i8] c"Thu\00"
@.str.4 = [4 x i8] c"Fri\00"
@.str.5 = [4 x i8] c"Sat\00"
@.str.6 = [4 x i8] c"Sun\00"
define i32 @find_wkday(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strncasecmp(i8* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 3)
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i32 1, i32* %2
br label %45
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @strncasecmp(i8* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 3)
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 2, i32* %2
br label %45
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @strncasecmp(i8* %14, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 3)
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i32 3, i32* %2
br label %45
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i64 @strncasecmp(i8* %19, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 3)
%21 = icmp eq i64 %20, 0
br i1 %21, label %22, label %23
22: ; preds = %18
store i32 4, i32* %2
br label %45
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = call i64 @strncasecmp(i8* %24, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 3)
%26 = icmp eq i64 %25, 0
br i1 %26, label %27, label %28
27: ; preds = %23
store i32 5, i32* %2
br label %45
28: ; preds = %23
%29 = load i8*, i8** %3
%30 = call i64 @strncasecmp(i8* %29, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), i32 3)
%31 = icmp eq i64 %30, 0
br i1 %31, label %32, label %33
32: ; preds = %28
store i32 6, i32* %2
br label %45
33: ; preds = %28
%34 = load i8*, i8** %3
%35 = call i64 @strncasecmp(i8* %34, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i32 3)
%36 = icmp eq i64 %35, 0
br i1 %36, label %37, label %38
37: ; preds = %33
store i32 0, i32* %2
br label %45
38: ; preds = %33
br label %39
39: ; preds = %38
br label %40
40: ; preds = %39
br label %41
41: ; preds = %40
br label %42
42: ; preds = %41
br label %43
43: ; preds = %42
br label %44
44: ; preds = %43
store i32 -1, i32* %2
br label %45
45: ; preds = %44, %37, %32, %27, %22, %17, %12, %7
%46 = load i32, i32* %2
ret i32 %46
}

LLVM IR (-O2):
@.str = [4 x i8] c"Mon\00"
@.str.1 = [4 x i8] c"Tue\00"
@.str.2 = [4 x i8] c"Wed\00"
@.str.3 = [4 x i8] c"Thu\00"
@.str.4 = [4 x i8] c"Fri\00"
@.str.5 = [4 x i8] c"Sat\00"
@.str.6 = [4 x i8] c"Sun\00"
define i32 @find_wkday(i8* nocapture %0) {
%2 = tail call i64 @strncasecmp(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 %23, label %4
4: ; preds = %1
%5 = tail call i64 @strncasecmp(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 %23, label %7
7: ; preds = %4
%8 = tail call i64 @strncasecmp(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 %23, label %10
10: ; preds = %7
%11 = tail call i64 @strncasecmp(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 %23, label %13
13: ; preds = %10
%14 = tail call i64 @strncasecmp(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 %23, label %16
16: ; preds = %13
%17 = tail call i64 @strncasecmp(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 %23, label %19
19: ; preds = %16
%20 = tail call i64 @strncasecmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.6, i64 0, i64 0), i32 3)
%21 = icmp ne i64 %20, 0
%22 = sext i1 %21 to i32
br label %23
23: ; preds = %19, %16, %13, %10, %7, %4, %1
%24 = phi i32 [ 1, %1 ], [ 2, %4 ], [ 3, %7 ], [ 4, %10 ], [ 5, %13 ], [ 6, %16 ], [ %22, %19 ]
ret i32 %24
}