void copy44d(double *src, double *dst) {
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
  *(dst++) = *(src++);
}


x86 assembly (clang, -O0):
<copy44d>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x8(%rbp)
movsd  (%rax),%xmm0
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0x8,%rcx
mov    %rcx,-0x10(%rbp)
movsd  %xmm0,(%rax)
pop    %rbp
ret

x86 assembly (clang, -O2):
<copy44d>:
movsd  (%rdi),%xmm0
movsd  %xmm0,(%rsi)
movsd  0x8(%rdi),%xmm0
movsd  %xmm0,0x8(%rsi)
movsd  0x10(%rdi),%xmm0
movsd  %xmm0,0x10(%rsi)
movsd  0x18(%rdi),%xmm0
movsd  %xmm0,0x18(%rsi)
movsd  0x20(%rdi),%xmm0
movsd  %xmm0,0x20(%rsi)
movsd  0x28(%rdi),%xmm0
movsd  %xmm0,0x28(%rsi)
movsd  0x30(%rdi),%xmm0
movsd  %xmm0,0x30(%rsi)
movsd  0x38(%rdi),%xmm0
movsd  %xmm0,0x38(%rsi)
movsd  0x40(%rdi),%xmm0
movsd  %xmm0,0x40(%rsi)
movsd  0x48(%rdi),%xmm0
movsd  %xmm0,0x48(%rsi)
movsd  0x50(%rdi),%xmm0
movsd  %xmm0,0x50(%rsi)
movsd  0x58(%rdi),%xmm0
movsd  %xmm0,0x58(%rsi)
movsd  0x60(%rdi),%xmm0
movsd  %xmm0,0x60(%rsi)
movsd  0x68(%rdi),%xmm0
movsd  %xmm0,0x68(%rsi)
movsd  0x70(%rdi),%xmm0
movsd  %xmm0,0x70(%rsi)
movsd  0x78(%rdi),%xmm0
movsd  %xmm0,0x78(%rsi)
ret

LLVM IR (-O0):
define void @copy44d(double* %0, double* %1) {
%3 = alloca double*
%4 = alloca double*
store double* %0, double** %3
store double* %1, double** %4
%5 = load double*, double** %3
%6 = getelementptr inbounds double, double* %5, i32 1
store double* %6, double** %3
%7 = load double, double* %5
%8 = load double*, double** %4
%9 = getelementptr inbounds double, double* %8, i32 1
store double* %9, double** %4
store double %7, double* %8
%10 = load double*, double** %3
%11 = getelementptr inbounds double, double* %10, i32 1
store double* %11, double** %3
%12 = load double, double* %10
%13 = load double*, double** %4
%14 = getelementptr inbounds double, double* %13, i32 1
store double* %14, double** %4
store double %12, double* %13
%15 = load double*, double** %3
%16 = getelementptr inbounds double, double* %15, i32 1
store double* %16, double** %3
%17 = load double, double* %15
%18 = load double*, double** %4
%19 = getelementptr inbounds double, double* %18, i32 1
store double* %19, double** %4
store double %17, double* %18
%20 = load double*, double** %3
%21 = getelementptr inbounds double, double* %20, i32 1
store double* %21, double** %3
%22 = load double, double* %20
%23 = load double*, double** %4
%24 = getelementptr inbounds double, double* %23, i32 1
store double* %24, double** %4
store double %22, double* %23
%25 = load double*, double** %3
%26 = getelementptr inbounds double, double* %25, i32 1
store double* %26, double** %3
%27 = load double, double* %25
%28 = load double*, double** %4
%29 = getelementptr inbounds double, double* %28, i32 1
store double* %29, double** %4
store double %27, double* %28
%30 = load double*, double** %3
%31 = getelementptr inbounds double, double* %30, i32 1
store double* %31, double** %3
%32 = load double, double* %30
%33 = load double*, double** %4
%34 = getelementptr inbounds double, double* %33, i32 1
store double* %34, double** %4
store double %32, double* %33
%35 = load double*, double** %3
%36 = getelementptr inbounds double, double* %35, i32 1
store double* %36, double** %3
%37 = load double, double* %35
%38 = load double*, double** %4
%39 = getelementptr inbounds double, double* %38, i32 1
store double* %39, double** %4
store double %37, double* %38
%40 = load double*, double** %3
%41 = getelementptr inbounds double, double* %40, i32 1
store double* %41, double** %3
%42 = load double, double* %40
%43 = load double*, double** %4
%44 = getelementptr inbounds double, double* %43, i32 1
store double* %44, double** %4
store double %42, double* %43
%45 = load double*, double** %3
%46 = getelementptr inbounds double, double* %45, i32 1
store double* %46, double** %3
%47 = load double, double* %45
%48 = load double*, double** %4
%49 = getelementptr inbounds double, double* %48, i32 1
store double* %49, double** %4
store double %47, double* %48
%50 = load double*, double** %3
%51 = getelementptr inbounds double, double* %50, i32 1
store double* %51, double** %3
%52 = load double, double* %50
%53 = load double*, double** %4
%54 = getelementptr inbounds double, double* %53, i32 1
store double* %54, double** %4
store double %52, double* %53
%55 = load double*, double** %3
%56 = getelementptr inbounds double, double* %55, i32 1
store double* %56, double** %3
%57 = load double, double* %55
%58 = load double*, double** %4
%59 = getelementptr inbounds double, double* %58, i32 1
store double* %59, double** %4
store double %57, double* %58
%60 = load double*, double** %3
%61 = getelementptr inbounds double, double* %60, i32 1
store double* %61, double** %3
%62 = load double, double* %60
%63 = load double*, double** %4
%64 = getelementptr inbounds double, double* %63, i32 1
store double* %64, double** %4
store double %62, double* %63
%65 = load double*, double** %3
%66 = getelementptr inbounds double, double* %65, i32 1
store double* %66, double** %3
%67 = load double, double* %65
%68 = load double*, double** %4
%69 = getelementptr inbounds double, double* %68, i32 1
store double* %69, double** %4
store double %67, double* %68
%70 = load double*, double** %3
%71 = getelementptr inbounds double, double* %70, i32 1
store double* %71, double** %3
%72 = load double, double* %70
%73 = load double*, double** %4
%74 = getelementptr inbounds double, double* %73, i32 1
store double* %74, double** %4
store double %72, double* %73
%75 = load double*, double** %3
%76 = getelementptr inbounds double, double* %75, i32 1
store double* %76, double** %3
%77 = load double, double* %75
%78 = load double*, double** %4
%79 = getelementptr inbounds double, double* %78, i32 1
store double* %79, double** %4
store double %77, double* %78
%80 = load double*, double** %3
%81 = getelementptr inbounds double, double* %80, i32 1
store double* %81, double** %3
%82 = load double, double* %80
%83 = load double*, double** %4
%84 = getelementptr inbounds double, double* %83, i32 1
store double* %84, double** %4
store double %82, double* %83
ret void
}

LLVM IR (-O2):
define void @copy44d(double* nocapture %0, double* nocapture writeonly %1) {
%3 = getelementptr inbounds double, double* %0, i64 1
%4 = load double, double* %0
%5 = getelementptr inbounds double, double* %1, i64 1
store double %4, double* %1
%6 = getelementptr inbounds double, double* %0, i64 2
%7 = load double, double* %3
%8 = getelementptr inbounds double, double* %1, i64 2
store double %7, double* %5
%9 = getelementptr inbounds double, double* %0, i64 3
%10 = load double, double* %6
%11 = getelementptr inbounds double, double* %1, i64 3
store double %10, double* %8
%12 = getelementptr inbounds double, double* %0, i64 4
%13 = load double, double* %9
%14 = getelementptr inbounds double, double* %1, i64 4
store double %13, double* %11
%15 = getelementptr inbounds double, double* %0, i64 5
%16 = load double, double* %12
%17 = getelementptr inbounds double, double* %1, i64 5
store double %16, double* %14
%18 = getelementptr inbounds double, double* %0, i64 6
%19 = load double, double* %15
%20 = getelementptr inbounds double, double* %1, i64 6
store double %19, double* %17
%21 = getelementptr inbounds double, double* %0, i64 7
%22 = load double, double* %18
%23 = getelementptr inbounds double, double* %1, i64 7
store double %22, double* %20
%24 = getelementptr inbounds double, double* %0, i64 8
%25 = load double, double* %21
%26 = getelementptr inbounds double, double* %1, i64 8
store double %25, double* %23
%27 = getelementptr inbounds double, double* %0, i64 9
%28 = load double, double* %24
%29 = getelementptr inbounds double, double* %1, i64 9
store double %28, double* %26
%30 = getelementptr inbounds double, double* %0, i64 10
%31 = load double, double* %27
%32 = getelementptr inbounds double, double* %1, i64 10
store double %31, double* %29
%33 = getelementptr inbounds double, double* %0, i64 11
%34 = load double, double* %30
%35 = getelementptr inbounds double, double* %1, i64 11
store double %34, double* %32
%36 = getelementptr inbounds double, double* %0, i64 12
%37 = load double, double* %33
%38 = getelementptr inbounds double, double* %1, i64 12
store double %37, double* %35
%39 = getelementptr inbounds double, double* %0, i64 13
%40 = load double, double* %36
%41 = getelementptr inbounds double, double* %1, i64 13
store double %40, double* %38
%42 = getelementptr inbounds double, double* %0, i64 14
%43 = load double, double* %39
%44 = getelementptr inbounds double, double* %1, i64 14
store double %43, double* %41
%45 = getelementptr inbounds double, double* %0, i64 15
%46 = load double, double* %42
%47 = getelementptr inbounds double, double* %1, i64 15
store double %46, double* %44
%48 = load double, double* %45
store double %48, double* %47
ret void
}