#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 const *, char const *);
int match_string(const char *string, const char *match[], int num) {
  int result = -1;
  for (int idx = 0; idx < num; idx++) {
    if (strcasecmp(string, match[idx]) == 0) {
      result = idx;
      break;
    }
  }
  return result;
}


x86 assembly (clang, -O0):
<match_string>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
movl   $0xffffffff,-0x18(%rbp)
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    117a <match_string+0x6a>
mov    -0x8(%rbp),%rdi
mov    -0x10(%rbp),%rax
movslq -0x1c(%rbp),%rcx
mov    (%rax,%rcx,8),%rsi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    1167 <match_string+0x57>
mov    -0x1c(%rbp),%eax
mov    %eax,-0x18(%rbp)
jmp    117a <match_string+0x6a>
jmp    116c <match_string+0x5c>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    1131 <match_string+0x21>
mov    -0x18(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<match_string>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    $0xffffffff,%r14d
test   %edx,%edx
jle    114f <match_string+0x3f>
mov    %rsi,%r15
mov    %rdi,%r12
mov    %edx,%ebp
xor    %ebx,%ebx
nopl   0x0(%rax)
mov    (%r15,%rbx,8),%rsi
mov    %r12,%rdi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     114c <match_string+0x3c>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1130 <match_string+0x20>
jmp    114f <match_string+0x3f>
mov    %ebx,%r14d
mov    %r14d,%eax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

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

LLVM IR (-O2):
define i32 @match_string(i8* nocapture %0, i8** nocapture %1, i32 %2) {
%4 = icmp sgt i32 %2, 0
br i1 %4, label %5, label %18
5: ; preds = %3
%6 = zext i32 %2 to i64
br label %7
7: ; preds = %5, %13
%8 = phi i64 [ 0, %5 ], [ %14, %13 ]
%9 = getelementptr inbounds i8*, i8** %1, i64 %8
%10 = load i8*, i8** %9
%11 = tail call i64 @strcasecmp(i8* %0, i8* %10)
%12 = icmp eq i64 %11, 0
br i1 %12, label %16, label %13
13: ; preds = %7
%14 = add nuw nsw i64 %8, 1
%15 = icmp eq i64 %14, %6
br i1 %15, label %18, label %7
16: ; preds = %7
%17 = trunc i64 %8 to i32
br label %18
18: ; preds = %13, %16, %3
%19 = phi i32 [ -1, %3 ], [ %17, %16 ], [ -1, %13 ]
ret i32 %19
}