#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 */
int strindex(char *, char *);
int parse(char s[]) {
  if (strindex(s, "sin") != -1)
    return '1';
  if (strindex(s, "exp") != -1)
    return '2';
  if (strindex(s, "pow") != -1)
    return '3';
  return '4';
}


x86 assembly (clang, -O0):
<parse>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xed9(%rip),%rsi
call   1030 <strindex@plt>
cmp    $0xffffffff,%eax
je     1141 <parse+0x31>
movl   $0x31,-0x4(%rbp)
jmp    1192 <parse+0x82>
mov    -0x10(%rbp),%rdi
lea    0xeb8(%rip),%rsi
call   1030 <strindex@plt>
cmp    $0xffffffff,%eax
je     1166 <parse+0x56>
movl   $0x32,-0x4(%rbp)
jmp    1192 <parse+0x82>
mov    -0x10(%rbp),%rdi
lea    0xe97(%rip),%rsi
call   1030 <strindex@plt>
cmp    $0xffffffff,%eax
je     118b <parse+0x7b>
movl   $0x33,-0x4(%rbp)
jmp    1192 <parse+0x82>
movl   $0x34,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<parse>:
push   %rbx
mov    %rdi,%rbx
lea    0xee5(%rip),%rsi
call   1030 <strindex@plt>
mov    %eax,%ecx
mov    $0x31,%eax
cmp    $0xffffffff,%ecx
je     112e <parse+0x1e>
pop    %rbx
ret
lea    0xecf(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strindex@plt>
mov    %eax,%ecx
mov    $0x32,%eax
cmp    $0xffffffff,%ecx
jne    112c <parse+0x1c>
lea    0xeb8(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strindex@plt>
mov    %eax,%ecx
xor    %eax,%eax
cmp    $0xffffffff,%ecx
sete   %al
add    $0x33,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"sin\00"
@.str.1 = [4 x i8] c"exp\00"
@.str.2 = [4 x i8] c"pow\00"
define i32 @parse(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i32 @strindex(i8* %4, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
%6 = icmp ne i32 %5, -1
br i1 %6, label %7, label %8
7: ; preds = %1
store i32 49, i32* %2
br label %19
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i32 @strindex(i8* %9, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0))
%11 = icmp ne i32 %10, -1
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 50, i32* %2
br label %19
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i32 @strindex(i8* %14, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
%16 = icmp ne i32 %15, -1
br i1 %16, label %17, label %18
17: ; preds = %13
store i32 51, i32* %2
br label %19
18: ; preds = %13
store i32 52, i32* %2
br label %19
19: ; preds = %18, %17, %12, %7
%20 = load i32, i32* %2
ret i32 %20
}

LLVM IR (-O2):
@.str = [4 x i8] c"sin\00"
@.str.1 = [4 x i8] c"exp\00"
@.str.2 = [4 x i8] c"pow\00"
define i32 @parse(i8* %0) {
%2 = tail call i32 @strindex(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32 %2, -1
br i1 %3, label %4, label %11
4: ; preds = %1
%5 = tail call i32 @strindex(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i32 %5, -1
br i1 %6, label %7, label %11
7: ; preds = %4
%8 = tail call i32 @strindex(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
%9 = icmp eq i32 %8, -1
%10 = select i1 %9, i32 52, i32 51
br label %11
11: ; preds = %7, %4, %1
%12 = phi i32 [ 49, %1 ], [ 50, %4 ], [ %10, %7 ]
ret i32 %12
}