#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__ abs(double);
double diff_buffer(int size, double *buf1, double *buf2) {
  int i;
  double diff = 0.0;
  for (i = 0; i < size; i++) {
    diff += abs(buf1[i] - buf2[i]);
  }
  return diff;
}


x86 assembly (clang, -O0):
<diff_buffer>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %edi,-0x4(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x28(%rbp)
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    117a <diff_buffer+0x6a>
mov    -0x10(%rbp),%rax
movslq -0x1c(%rbp),%rcx
movsd  (%rax,%rcx,8),%xmm0
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
subsd  (%rax,%rcx,8),%xmm0
call   1030 <abs@plt>
cvtsi2sd %rax,%xmm0
addsd  -0x28(%rbp),%xmm0
movsd  %xmm0,-0x28(%rbp)
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    1132 <diff_buffer+0x22>
movsd  -0x28(%rbp),%xmm0
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<diff_buffer>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
test   %edi,%edi
jle    1137 <diff_buffer+0x27>
mov    %rdx,%r14
mov    %rsi,%r12
mov    %edi,%r15d
cmp    $0x1,%edi
jne    1140 <diff_buffer+0x30>
xorpd  %xmm0,%xmm0
xor    %ebx,%ebx
jmp    11a5 <diff_buffer+0x95>
xorpd  %xmm0,%xmm0
jmp    11e0 <diff_buffer+0xd0>
mov    %r15d,%r13d
and    $0xfffffffe,%r13d
xorpd  %xmm0,%xmm0
xor    %ebx,%ebx
nopl   (%rax)
movsd  %xmm0,0x8(%rsp)
movsd  (%r12,%rbx,8),%xmm0
subsd  (%r14,%rbx,8),%xmm0
call   1030 <abs@plt>
xorps  %xmm0,%xmm0
cvtsi2sd %rax,%xmm0
addsd  0x8(%rsp),%xmm0
movsd  %xmm0,0x8(%rsp)
movsd  0x8(%r12,%rbx,8),%xmm0
subsd  0x8(%r14,%rbx,8),%xmm0
call   1030 <abs@plt>
xorps  %xmm0,%xmm0
cvtsi2sd %rax,%xmm0
addsd  0x8(%rsp),%xmm0
add    $0x2,%rbx
cmp    %rbx,%r13
jne    1150 <diff_buffer+0x40>
test   $0x1,%r15b
je     11e0 <diff_buffer+0xd0>
movsd  %xmm0,0x8(%rsp)
movsd  (%r12,%rbx,8),%xmm0
subsd  (%r14,%rbx,8),%xmm0
call   1030 <abs@plt>
xorps  %xmm0,%xmm0
cvtsi2sd %rax,%xmm0
movsd  0x8(%rsp),%xmm1
addsd  %xmm0,%xmm1
movsd  %xmm1,0x8(%rsp)
movsd  0x8(%rsp),%xmm0
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define double @diff_buffer(i32 %0, double* %1, double* %2) {
%4 = alloca i32
%5 = alloca double*
%6 = alloca double*
%7 = alloca i32
%8 = alloca double
store i32 %0, i32* %4
store double* %1, double** %5
store double* %2, double** %6
store double 0.000000e+00, double* %8
store i32 0, i32* %7
br label %9
9: ; preds = %29, %3
%10 = load i32, i32* %7
%11 = load i32, i32* %4
%12 = icmp slt i32 %10, %11
br i1 %12, label %13, label %32
13: ; preds = %9
%14 = load double*, double** %5
%15 = load i32, i32* %7
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds double, double* %14, i64 %16
%18 = load double, double* %17
%19 = load double*, double** %6
%20 = load i32, i32* %7
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds double, double* %19, i64 %21
%23 = load double, double* %22
%24 = fsub double %18, %23
%25 = call i64 @abs(double %24)
%26 = sitofp i64 %25 to double
%27 = load double, double* %8
%28 = fadd double %27, %26
store double %28, double* %8
br label %29
29: ; preds = %13
%30 = load i32, i32* %7
%31 = add nsw i32 %30, 1
store i32 %31, i32* %7
br label %9
32: ; preds = %9
%33 = load double, double* %8
ret double %33
}

LLVM IR (-O2):
define double @diff_buffer(i32 %0, double* nocapture %1, double* nocapture %2) {
%4 = icmp sgt i32 %0, 0
br i1 %4, label %5, label %49
5: ; preds = %3
%6 = zext i32 %0 to i64
%7 = and i64 %6, 1
%8 = icmp eq i32 %0, 1
br i1 %8, label %35, label %9
9: ; preds = %5
%10 = and i64 %6, 4294967294
br label %11
11: ; preds = %11, %9
%12 = phi i64 [ 0, %9 ], [ %32, %11 ]
%13 = phi double [ 0.000000e+00, %9 ], [ %31, %11 ]
%14 = phi i64 [ 0, %9 ], [ %33, %11 ]
%15 = getelementptr inbounds double, double* %1, i64 %12
%16 = load double, double* %15
%17 = getelementptr inbounds double, double* %2, i64 %12
%18 = load double, double* %17
%19 = fsub double %16, %18
%20 = tail call i64 @abs(double %19)
%21 = sitofp i64 %20 to double
%22 = fadd double %13, %21
%23 = or i64 %12, 1
%24 = getelementptr inbounds double, double* %1, i64 %23
%25 = load double, double* %24
%26 = getelementptr inbounds double, double* %2, i64 %23
%27 = load double, double* %26
%28 = fsub double %25, %27
%29 = tail call i64 @abs(double %28)
%30 = sitofp i64 %29 to double
%31 = fadd double %22, %30
%32 = add nuw nsw i64 %12, 2
%33 = add i64 %14, 2
%34 = icmp eq i64 %33, %10
br i1 %34, label %35, label %11
35: ; preds = %11, %5
%36 = phi double [ undef, %5 ], [ %31, %11 ]
%37 = phi i64 [ 0, %5 ], [ %32, %11 ]
%38 = phi double [ 0.000000e+00, %5 ], [ %31, %11 ]
%39 = icmp eq i64 %7, 0
br i1 %39, label %49, label %40
40: ; preds = %35
%41 = getelementptr inbounds double, double* %1, i64 %37
%42 = load double, double* %41
%43 = getelementptr inbounds double, double* %2, i64 %37
%44 = load double, double* %43
%45 = fsub double %42, %44
%46 = tail call i64 @abs(double %45)
%47 = sitofp i64 %46 to double
%48 = fadd double %38, %47
br label %49
49: ; preds = %40, %35, %3
%50 = phi double [ 0.000000e+00, %3 ], [ %36, %35 ], [ %48, %40 ]
ret double %50
}