#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 *, unsigned int);
void main(void) {
  unsigned short i;
  unsigned int sum;
  for (i = 0; i < 1000; ++i) {
    if (i % 3 == 0 || i % 5 == 0)
      sum += i;
  }
  printf("%d\n", sum);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movw   $0x0,-0x2(%rbp)
movzwl -0x2(%rbp),%eax
cmp    $0x3e8,%eax
jge    1177 <main+0x67>
movzwl -0x2(%rbp),%eax
mov    $0x3,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
je     1157 <main+0x47>
movzwl -0x2(%rbp),%eax
mov    $0x5,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
jne    1161 <main+0x51>
movzwl -0x2(%rbp),%eax
add    -0x8(%rbp),%eax
mov    %eax,-0x8(%rbp)
jmp    1166 <main+0x56>
mov    -0x2(%rbp),%ax
add    $0x1,%ax
mov    %ax,-0x2(%rbp)
jmp    111e <main+0xe>
mov    -0x8(%rbp),%esi
lea    0xe7f(%rip),%rdi
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
movdqa 0xee7(%rip),%xmm8
pxor   %xmm1,%xmm1
movdqa 0xeeb(%rip),%xmm2
mov    $0x3e8,%eax
movdqa 0xf0d(%rip),%xmm15
movdqa 0xf14(%rip),%xmm10
movdqa 0xf1b(%rip),%xmm11
movdqa 0xf23(%rip),%xmm3
movdqa 0xf2a(%rip),%xmm12
movdqa 0xf31(%rip),%xmm13
movdqa 0xf38(%rip),%xmm14
pxor   %xmm7,%xmm7
pxor   %xmm6,%xmm6
movdqa %xmm8,%xmm0
pmullw 0xeb3(%rip),%xmm0
movdqa %xmm0,%xmm5
psubusw %xmm15,%xmm5
pcmpeqw %xmm1,%xmm5
movdqa %xmm8,%xmm4
pmullw %xmm11,%xmm4
movdqa %xmm4,%xmm9
psubusw %xmm3,%xmm9
pcmpeqw %xmm1,%xmm9
por    %xmm5,%xmm9
paddw  %xmm10,%xmm0
psubusw %xmm15,%xmm0
pcmpeqw %xmm1,%xmm0
paddw  %xmm12,%xmm4
psubusw %xmm3,%xmm4
pcmpeqw %xmm1,%xmm4
por    %xmm0,%xmm4
movdqa %xmm2,%xmm0
paddd  0xe4d(%rip),%xmm0
punpcklwd %xmm4,%xmm4
psrad  $0x10,%xmm4
pand   %xmm0,%xmm4
paddd  %xmm4,%xmm6
punpcklwd %xmm9,%xmm0
psrad  $0x10,%xmm0
pand   %xmm2,%xmm0
paddd  %xmm0,%xmm7
paddd  %xmm13,%xmm2
paddw  %xmm14,%xmm8
add    $0xfffffff8,%eax
jne    1170 <main+0x60>
paddd  %xmm7,%xmm6
pshufd $0xee,%xmm6,%xmm0
paddd  %xmm6,%xmm0
pshufd $0x55,%xmm0,%xmm1
paddd  %xmm0,%xmm1
movd   %xmm1,%esi
lea    0xe86(%rip),%rdi
jmp    1030 <printf@plt>

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
define void @main() {
%1 = alloca i16
%2 = alloca i32
store i16 0, i16* %1
br label %3
3: ; preds = %23, %0
%4 = load i16, i16* %1
%5 = zext i16 %4 to i32
%6 = icmp slt i32 %5, 1000
br i1 %6, label %7, label %26
7: ; preds = %3
%8 = load i16, i16* %1
%9 = zext i16 %8 to i32
%10 = srem i32 %9, 3
%11 = icmp eq i32 %10, 0
br i1 %11, label %17, label %12
12: ; preds = %7
%13 = load i16, i16* %1
%14 = zext i16 %13 to i32
%15 = srem i32 %14, 5
%16 = icmp eq i32 %15, 0
br i1 %16, label %17, label %22
17: ; preds = %12, %7
%18 = load i16, i16* %1
%19 = zext i16 %18 to i32
%20 = load i32, i32* %2
%21 = add i32 %20, %19
store i32 %21, i32* %2
br label %22
22: ; preds = %17, %12
br label %23
23: ; preds = %22
%24 = load i16, i16* %1
%25 = add i16 %24, 1
store i16 %25, i16* %1
br label %3
26: ; preds = %3
%27 = load i32, i32* %2
%28 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %27)
ret void
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
define void @main() {
br label %1
1: ; preds = %1, %0
%2 = phi i32 [ 0, %0 ], [ %23, %1 ]
%3 = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %0 ], [ %24, %1 ]
%4 = phi <4 x i32> [ <i32 undef, i32 0, i32 0, i32 0>, %0 ], [ %21, %1 ]
%5 = phi <4 x i32> [ zeroinitializer, %0 ], [ %22, %1 ]
%6 = phi <4 x i16> [ <i16 0, i16 1, i16 2, i16 3>, %0 ], [ %25, %1 ]
%7 = add <4 x i32> %3, <i32 4, i32 4, i32 4, i32 4>
%8 = add <4 x i16> %6, <i16 4, i16 4, i16 4, i16 4>
%9 = urem <4 x i16> %6, <i16 3, i16 3, i16 3, i16 3>
%10 = urem <4 x i16> %8, <i16 3, i16 3, i16 3, i16 3>
%11 = icmp eq <4 x i16> %9, zeroinitializer
%12 = icmp eq <4 x i16> %10, zeroinitializer
%13 = urem <4 x i16> %6, <i16 5, i16 5, i16 5, i16 5>
%14 = urem <4 x i16> %8, <i16 5, i16 5, i16 5, i16 5>
%15 = icmp eq <4 x i16> %13, zeroinitializer
%16 = icmp eq <4 x i16> %14, zeroinitializer
%17 = or <4 x i1> %11, %15
%18 = or <4 x i1> %12, %16
%19 = select <4 x i1> %17, <4 x i32> %3, <4 x i32> zeroinitializer
%20 = select <4 x i1> %18, <4 x i32> %7, <4 x i32> zeroinitializer
%21 = add <4 x i32> %19, %4
%22 = add <4 x i32> %20, %5
%23 = add nuw i32 %2, 8
%24 = add <4 x i32> %3, <i32 8, i32 8, i32 8, i32 8>
%25 = add <4 x i16> %6, <i16 8, i16 8, i16 8, i16 8>
%26 = icmp eq i32 %23, 1000
br i1 %26, label %27, label %1
27: ; preds = %1
%28 = add <4 x i32> %22, %21
%29 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %28)
%30 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %29)
ret void
}