#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__ isalpha(char);
scalar_t__ isblank(char);
int /*<<< orphan*/ printf(char *, ...);
void print_letters(char args[], int length) {
  int i = 0;
  while (i < length) {
    if (isalpha(args[i]) || isblank(args[i])) {
      printf("'%c' == %d", args[i], args[i]);
    }
    i++;
  }
  printf("\n");
}


x86 assembly (clang, -O0):
<print_letters>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    11bc <print_letters+0x8c>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1050 <isalpha@plt>
cmp    $0x0,%rax
jne    1188 <print_letters+0x58>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1040 <isblank@plt>
cmp    $0x0,%rax
je     11ae <print_letters+0x7e>
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%esi
mov    -0x8(%rbp),%rax
movslq -0x10(%rbp),%rcx
movsbl (%rax,%rcx,1),%edx
lea    0xe59(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x10(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x10(%rbp)
jmp    1146 <print_letters+0x16>
lea    0xe48(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_letters>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %esi,%esi
jle    119a <print_letters+0x5a>
mov    %rdi,%r12
mov    %esi,%r15d
lea    0xea7(%rip),%r14
xor    %ebx,%ebx
jmp    117a <print_letters+0x3a>
nopl   (%rax)
movsbl (%r12,%rbx,1),%edx
mov    %r14,%rdi
mov    %edx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%r15
je     119a <print_letters+0x5a>
movsbl (%r12,%rbx,1),%edi
call   1060 <isalpha@plt>
test   %rax,%rax
jne    1160 <print_letters+0x20>
movsbl (%r12,%rbx,1),%edi
call   1050 <isblank@plt>
test   %rax,%rax
jne    1160 <print_letters+0x20>
jmp    1171 <print_letters+0x31>
mov    $0xa,%edi
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
jmp    1030 <putchar@plt>

LLVM IR (-O0):
@.str = [11 x i8] c"'%c' == %d\00"
@.str.1 = [2 x i8] c"\0A\00"
define void @print_letters(i8* %0, i32 %1) {
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
store i8* %0, i8** %3
store i32 %1, i32* %4
store i32 0, i32* %5
br label %6
6: ; preds = %40, %2
%7 = load i32, i32* %5
%8 = load i32, i32* %4
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %43
10: ; preds = %6
%11 = load i8*, i8** %3
%12 = load i32, i32* %5
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %11, i64 %13
%15 = load i8, i8* %14
%16 = call i64 @isalpha(i8 signext %15)
%17 = icmp ne i64 %16, 0
br i1 %17, label %26, label %18
18: ; preds = %10
%19 = load i8*, i8** %3
%20 = load i32, i32* %5
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i8, i8* %19, i64 %21
%23 = load i8, i8* %22
%24 = call i64 @isblank(i8 signext %23)
%25 = icmp ne i64 %24, 0
br i1 %25, label %26, label %40
26: ; preds = %18, %10
%27 = load i8*, i8** %3
%28 = load i32, i32* %5
%29 = sext i32 %28 to i64
%30 = getelementptr inbounds i8, i8* %27, i64 %29
%31 = load i8, i8* %30
%32 = sext i8 %31 to i32
%33 = load i8*, i8** %3
%34 = load i32, i32* %5
%35 = sext i32 %34 to i64
%36 = getelementptr inbounds i8, i8* %33, i64 %35
%37 = load i8, i8* %36
%38 = sext i8 %37 to i32
%39 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 %32, i32 %38)
br label %40
40: ; preds = %26, %18
%41 = load i32, i32* %5
%42 = add nsw i32 %41, 1
store i32 %42, i32* %5
br label %6
43: ; preds = %6
%44 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [11 x i8] c"'%c' == %d\00"
define void @print_letters(i8* nocapture %0, i32 %1) {
%3 = icmp sgt i32 %1, 0
br i1 %3, label %4, label %23
4: ; preds = %2
%5 = zext i32 %1 to i64
br label %6
6: ; preds = %4, %20
%7 = phi i64 [ 0, %4 ], [ %21, %20 ]
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = load i8, i8* %8
%10 = tail call i64 @isalpha(i8 signext %9)
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %16
12: ; preds = %6
%13 = load i8, i8* %8
%14 = tail call i64 @isblank(i8 signext %13)
%15 = icmp eq i64 %14, 0
br i1 %15, label %20, label %16
16: ; preds = %12, %6
%17 = load i8, i8* %8
%18 = sext i8 %17 to i32
%19 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i32 %18, i32 %18)
br label %20
20: ; preds = %16, %12
%21 = add nuw nsw i64 %7, 1
%22 = icmp eq i64 %21, %5
br i1 %22, label %23, label %6
23: ; preds = %20, %2
%24 = tail call i32 @putchar(i32 10)
ret void
}