void matrix_rigid_body_transform_get_translation_matrix_4x4d(const double m[16],
                                                             double t[16]) {
  t[0] = 1;
  t[1] = 0;
  t[2] = 0;
  t[3] = m[3];
  t[4] = 0;
  t[5] = 1;
  t[6] = 0;
  t[7] = m[7];
  t[8] = 0;
  t[9] = 0;
  t[10] = 1;
  t[11] = m[11];
  t[12] = t[13] = t[14] = 0;
  t[15] = 1;
}


x86 assembly (clang, -O0):
<matrix_rigid_body_transform_get_translation_matrix_4x4d>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x10(%rbp),%rax
movsd  0xee8(%rip),%xmm0
movsd  %xmm0,(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x8(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x10(%rax)
mov    -0x8(%rbp),%rax
movsd  0x18(%rax),%xmm0
mov    -0x10(%rbp),%rax
movsd  %xmm0,0x18(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x20(%rax)
mov    -0x10(%rbp),%rax
movsd  0xea2(%rip),%xmm0
movsd  %xmm0,0x28(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x30(%rax)
mov    -0x8(%rbp),%rax
movsd  0x38(%rax),%xmm0
mov    -0x10(%rbp),%rax
movsd  %xmm0,0x38(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x40(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x48(%rax)
mov    -0x10(%rbp),%rax
movsd  0xe5b(%rip),%xmm0
movsd  %xmm0,0x50(%rax)
mov    -0x8(%rbp),%rax
movsd  0x58(%rax),%xmm0
mov    -0x10(%rbp),%rax
movsd  %xmm0,0x58(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x70(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x68(%rax)
mov    -0x10(%rbp),%rax
xorps  %xmm0,%xmm0
movsd  %xmm0,0x60(%rax)
mov    -0x10(%rbp),%rax
movsd  0xe14(%rip),%xmm0
movsd  %xmm0,0x78(%rax)
pop    %rbp
ret

x86 assembly (clang, -O2):
<matrix_rigid_body_transform_get_translation_matrix_4x4d>:
movabs $0x3ff0000000000000,%rax
mov    %rax,(%rsi)
xorps  %xmm0,%xmm0
movups %xmm0,0x8(%rsi)
movsd  0x18(%rdi),%xmm1
xorps  %xmm2,%xmm2
movhps 0xedd(%rip),%xmm2
movsd  %xmm1,0x18(%rsi)
movups %xmm2,0x20(%rsi)
movq   $0x0,0x30(%rsi)
movsd  0x38(%rdi),%xmm1
movsd  %xmm1,0x38(%rsi)
movups %xmm0,0x40(%rsi)
mov    %rax,0x50(%rsi)
movsd  0x58(%rdi),%xmm1
movsd  %xmm1,0x58(%rsi)
movups %xmm0,0x60(%rsi)
movq   $0x0,0x70(%rsi)
mov    %rax,0x78(%rsi)
ret

LLVM IR (-O0):
define void @matrix_rigid_body_transform_get_translation_matrix_4x4d(double* %0, double* %1) {
%3 = alloca double*
%4 = alloca double*
store double* %0, double** %3
store double* %1, double** %4
%5 = load double*, double** %4
%6 = getelementptr inbounds double, double* %5, i64 0
store double 1.000000e+00, double* %6
%7 = load double*, double** %4
%8 = getelementptr inbounds double, double* %7, i64 1
store double 0.000000e+00, double* %8
%9 = load double*, double** %4
%10 = getelementptr inbounds double, double* %9, i64 2
store double 0.000000e+00, double* %10
%11 = load double*, double** %3
%12 = getelementptr inbounds double, double* %11, i64 3
%13 = load double, double* %12
%14 = load double*, double** %4
%15 = getelementptr inbounds double, double* %14, i64 3
store double %13, double* %15
%16 = load double*, double** %4
%17 = getelementptr inbounds double, double* %16, i64 4
store double 0.000000e+00, double* %17
%18 = load double*, double** %4
%19 = getelementptr inbounds double, double* %18, i64 5
store double 1.000000e+00, double* %19
%20 = load double*, double** %4
%21 = getelementptr inbounds double, double* %20, i64 6
store double 0.000000e+00, double* %21
%22 = load double*, double** %3
%23 = getelementptr inbounds double, double* %22, i64 7
%24 = load double, double* %23
%25 = load double*, double** %4
%26 = getelementptr inbounds double, double* %25, i64 7
store double %24, double* %26
%27 = load double*, double** %4
%28 = getelementptr inbounds double, double* %27, i64 8
store double 0.000000e+00, double* %28
%29 = load double*, double** %4
%30 = getelementptr inbounds double, double* %29, i64 9
store double 0.000000e+00, double* %30
%31 = load double*, double** %4
%32 = getelementptr inbounds double, double* %31, i64 10
store double 1.000000e+00, double* %32
%33 = load double*, double** %3
%34 = getelementptr inbounds double, double* %33, i64 11
%35 = load double, double* %34
%36 = load double*, double** %4
%37 = getelementptr inbounds double, double* %36, i64 11
store double %35, double* %37
%38 = load double*, double** %4
%39 = getelementptr inbounds double, double* %38, i64 14
store double 0.000000e+00, double* %39
%40 = load double*, double** %4
%41 = getelementptr inbounds double, double* %40, i64 13
store double 0.000000e+00, double* %41
%42 = load double*, double** %4
%43 = getelementptr inbounds double, double* %42, i64 12
store double 0.000000e+00, double* %43
%44 = load double*, double** %4
%45 = getelementptr inbounds double, double* %44, i64 15
store double 1.000000e+00, double* %45
ret void
}

LLVM IR (-O2):
define void @matrix_rigid_body_transform_get_translation_matrix_4x4d(double* nocapture %0, double* nocapture writeonly %1) {
store double 1.000000e+00, double* %1
%3 = getelementptr inbounds double, double* %1, i64 1
%4 = getelementptr inbounds double, double* %0, i64 3
%5 = bitcast double* %3 to i8*
%6 = load double, double* %4
%7 = getelementptr inbounds double, double* %1, i64 3
store double %6, double* %7
%8 = getelementptr inbounds double, double* %1, i64 4
%9 = bitcast double* %8 to <2 x double>*
store <2 x double> <double 0.000000e+00, double 1.000000e+00>, <2 x double>* %9
%10 = getelementptr inbounds double, double* %1, i64 6
store double 0.000000e+00, double* %10
%11 = getelementptr inbounds double, double* %0, i64 7
%12 = load double, double* %11
%13 = getelementptr inbounds double, double* %1, i64 7
store double %12, double* %13
%14 = getelementptr inbounds double, double* %1, i64 8
%15 = getelementptr inbounds double, double* %1, i64 10
%16 = bitcast double* %14 to i8*
store double 1.000000e+00, double* %15
%17 = getelementptr inbounds double, double* %0, i64 11
%18 = load double, double* %17
%19 = getelementptr inbounds double, double* %1, i64 11
store double %18, double* %19
%20 = getelementptr inbounds double, double* %1, i64 12
%21 = getelementptr inbounds double, double* %1, i64 15
%22 = bitcast double* %20 to i8*
store double 1.000000e+00, double* %21
ret void
}