#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 /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int sum(int *, int);
main() {
  int a[100] = {0};
  int i, n;
  printf("n=");
  scanf("%d", &n);
  printf("a=");
  for (i = 0; i < n; i++) {
    scanf("%d", &a[i]);
  }
  printf("sum(a)=%d\n", sum(a, n));
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x1b0,%rsp
movl   $0x0,-0x4(%rbp)
lea    -0x1a0(%rbp),%rdi
xor    %esi,%esi
mov    $0x190,%edx
call   1040 <memset@plt>
lea    0xe94(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe89(%rip),%rdi
lea    -0x1a8(%rbp),%rsi
call   1060 <scanf@plt>
lea    0xe79(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x1a4(%rbp)
mov    -0x1a4(%rbp),%eax
cmp    -0x1a8(%rbp),%eax
jge    11e5 <main+0xa5>
movslq -0x1a4(%rbp),%rax
lea    -0x1a0(%rbp),%rsi
shl    $0x2,%rax
add    %rax,%rsi
lea    0xe37(%rip),%rdi
call   1060 <scanf@plt>
mov    -0x1a4(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1a4(%rbp)
jmp    119e <main+0x5e>
lea    -0x1a0(%rbp),%rdi
mov    -0x1a8(%rbp),%esi
call   1050 <sum@plt>
mov    %eax,%esi
lea    0xe09(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x1b0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x1a0,%rsp
lea    0x10(%rsp),%r15
mov    $0x190,%edx
mov    %r15,%rdi
xor    %esi,%esi
call   1040 <memset@plt>
lea    0xe99(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xe8e(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1060 <scanf@plt>
lea    0xe80(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
test   %esi,%esi
jle    11bd <main+0x7d>
xor    %ebx,%ebx
lea    0xe65(%rip),%r14
xchg   %ax,%ax
mov    %r14,%rdi
mov    %r15,%rsi
call   1060 <scanf@plt>
add    $0x1,%rbx
movslq 0xc(%rsp),%rsi
add    $0x4,%r15
cmp    %rsi,%rbx
jl     11a0 <main+0x60>
lea    0x10(%rsp),%rdi
call   1050 <sum@plt>
lea    0xe3b(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x1a0,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [3 x i8] c"n=\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [3 x i8] c"a=\00"
@.str.3 = [11 x i8] c"sum(a)=%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [100 x i32]
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = bitcast [100 x i32]* %2 to i8*
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %4)
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
store i32 0, i32* %3
br label %9
9: ; preds = %18, %0
%10 = load i32, i32* %3
%11 = load i32, i32* %4
%12 = icmp slt i32 %10, %11
br i1 %12, label %13, label %21
13: ; preds = %9
%14 = load i32, i32* %3
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds [100 x i32], [100 x i32]* %2, i64 0, i64 %15
%17 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %16)
br label %18
18: ; preds = %13
%19 = load i32, i32* %3
%20 = add nsw i32 %19, 1
store i32 %20, i32* %3
br label %9
21: ; preds = %9
%22 = getelementptr inbounds [100 x i32], [100 x i32]* %2, i64 0, i64 0
%23 = load i32, i32* %4
%24 = call i32 @sum(i32* %22, i32 %23)
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.3, i64 0, i64 0), i32 %24)
%26 = load i32, i32* %1
ret i32 %26
}

LLVM IR (-O2):
@.str = [3 x i8] c"n=\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [3 x i8] c"a=\00"
@.str.3 = [11 x i8] c"sum(a)=%d\0A\00"
define i32 @main() {
%1 = alloca [100 x i32]
%2 = alloca i32
%3 = bitcast [100 x i32]* %1 to i8*
%4 = bitcast i32* %2 to i8*
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
%8 = load i32, i32* %2
%9 = icmp sgt i32 %8, 0
br i1 %9, label %10, label %18
10: ; preds = %0, %10
%11 = phi i64 [ %14, %10 ], [ 0, %0 ]
%12 = getelementptr inbounds [100 x i32], [100 x i32]* %1, i64 0, i64 %11
%13 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %12)
%14 = add nuw nsw i64 %11, 1
%15 = load i32, i32* %2
%16 = sext i32 %15 to i64
%17 = icmp slt i64 %14, %16
br i1 %17, label %10, label %18
18: ; preds = %10, %0
%19 = phi i32 [ %8, %0 ], [ %15, %10 ]
%20 = getelementptr inbounds [100 x i32], [100 x i32]* %1, i64 0, i64 0
%21 = call i32 @sum(i32* %20, i32 %19)
%22 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @.str.3, i64 0, i64 0), i32 %21)
ret i32 0
}