void corner_dttmm_ll_nt_4x4_lib4(double *A, double *B, double *C) {
  const int bs = 4;
  double a_0, a_1, a_2, a_3, b_0, b_1, b_2, b_3,
      c_00 = 0, c_10 = 0, c_11 = 0, c_20 = 0, c_21 = 0, c_22 = 0, c_30 = 0,
      c_31 = 0, c_32 = 0, c_33 = 0;
  a_0 = A[0 + bs * 0];
  a_1 = A[1 + bs * 0];
  a_2 = A[2 + bs * 0];
  a_3 = A[3 + bs * 0];
  b_0 = B[0 + bs * 0];
  c_00 += a_0 * b_0;
  c_10 += a_1 * b_0;
  c_20 += a_2 * b_0;
  c_30 += a_3 * b_0;
  a_1 = A[1 + bs * 1];
  a_2 = A[2 + bs * 1];
  a_3 = A[3 + bs * 1];
  b_0 = B[0 + bs * 1];
  b_1 = B[1 + bs * 1];
  c_10 += a_1 * b_0;
  c_20 += a_2 * b_0;
  c_30 += a_3 * b_0;
  c_11 += a_1 * b_1;
  c_21 += a_2 * b_1;
  c_31 += a_3 * b_1;
  a_2 = A[2 + bs * 2];
  a_3 = A[3 + bs * 2];
  b_0 = B[0 + bs * 2];
  b_1 = B[1 + bs * 2];
  b_2 = B[2 + bs * 2];
  c_20 += a_2 * b_0;
  c_30 += a_3 * b_0;
  c_21 += a_2 * b_1;
  c_31 += a_3 * b_1;
  c_22 += a_2 * b_2;
  c_32 += a_3 * b_2;
  a_3 = A[3 + bs * 3];
  b_0 = B[0 + bs * 3];
  b_1 = B[1 + bs * 3];
  b_2 = B[2 + bs * 3];
  b_3 = B[3 + bs * 3];
  c_30 += a_3 * b_0;
  c_31 += a_3 * b_1;
  c_32 += a_3 * b_2;
  c_33 += a_3 * b_3;
  C[0 + bs * 0] = c_00;
  C[1 + bs * 0] = c_10;
  C[2 + bs * 0] = c_20;
  C[3 + bs * 0] = c_30;
  C[1 + bs * 1] = c_11;
  C[2 + bs * 1] = c_21;
  C[3 + bs * 1] = c_31;
  C[2 + bs * 2] = c_22;
  C[3 + bs * 2] = c_32;
  C[3 + bs * 3] = c_33;
}


x86 assembly (clang, -O0):
<corner_dttmm_ll_nt_4x4_lib4>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
movl   $0x4,-0x1c(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x68(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x70(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x78(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x80(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x88(%rbp)
ff
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x90(%rbp)
ff
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x98(%rbp)
ff
xorps  %xmm0,%xmm0
movsd  %xmm0,-0xa0(%rbp)
ff
xorps  %xmm0,%xmm0
movsd  %xmm0,-0xa8(%rbp)
ff
xorps  %xmm0,%xmm0
movsd  %xmm0,-0xb0(%rbp)
ff
mov    -0x8(%rbp),%rax
movsd  (%rax),%xmm0
movsd  %xmm0,-0x28(%rbp)
mov    -0x8(%rbp),%rax
movsd  0x8(%rax),%xmm0
movsd  %xmm0,-0x30(%rbp)
mov    -0x8(%rbp),%rax
movsd  0x10(%rax),%xmm0
movsd  %xmm0,-0x38(%rbp)
mov    -0x8(%rbp),%rax
movsd  0x18(%rax),%xmm0
movsd  %xmm0,-0x40(%rbp)
mov    -0x10(%rbp),%rax
movsd  (%rax),%xmm0
movsd  %xmm0,-0x48(%rbp)
movsd  -0x28(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x68(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x68(%rbp)
movsd  -0x30(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x70(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x70(%rbp)
movsd  -0x38(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x80(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x80(%rbp)
movsd  -0x40(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x98(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x98(%rbp)
ff
mov    -0x8(%rbp),%rax
movsd  0x28(%rax),%xmm0
movsd  %xmm0,-0x30(%rbp)
mov    -0x8(%rbp),%rax
movsd  0x30(%rax),%xmm0
movsd  %xmm0,-0x38(%rbp)
mov    -0x8(%rbp),%rax
movsd  0x38(%rax),%xmm0
movsd  %xmm0,-0x40(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x20(%rax),%xmm0
movsd  %xmm0,-0x48(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x28(%rax),%xmm0
movsd  %xmm0,-0x50(%rbp)
movsd  -0x30(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x70(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x70(%rbp)
movsd  -0x38(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x80(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x80(%rbp)
movsd  -0x40(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x98(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x98(%rbp)
ff
movsd  -0x30(%rbp),%xmm0
movsd  -0x50(%rbp),%xmm2
movsd  -0x78(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x78(%rbp)
movsd  -0x38(%rbp),%xmm0
movsd  -0x50(%rbp),%xmm2
movsd  -0x88(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x88(%rbp)
ff
movsd  -0x40(%rbp),%xmm0
movsd  -0x50(%rbp),%xmm2
movsd  -0xa0(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0xa0(%rbp)
ff
mov    -0x8(%rbp),%rax
movsd  0x50(%rax),%xmm0
movsd  %xmm0,-0x38(%rbp)
mov    -0x8(%rbp),%rax
movsd  0x58(%rax),%xmm0
movsd  %xmm0,-0x40(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x40(%rax),%xmm0
movsd  %xmm0,-0x48(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x48(%rax),%xmm0
movsd  %xmm0,-0x50(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x50(%rax),%xmm0
movsd  %xmm0,-0x58(%rbp)
movsd  -0x38(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x80(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x80(%rbp)
movsd  -0x40(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x98(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x98(%rbp)
ff
movsd  -0x38(%rbp),%xmm0
movsd  -0x50(%rbp),%xmm2
movsd  -0x88(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x88(%rbp)
ff
movsd  -0x40(%rbp),%xmm0
movsd  -0x50(%rbp),%xmm2
movsd  -0xa0(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0xa0(%rbp)
ff
movsd  -0x38(%rbp),%xmm0
movsd  -0x58(%rbp),%xmm2
movsd  -0x90(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x90(%rbp)
ff
movsd  -0x40(%rbp),%xmm0
movsd  -0x58(%rbp),%xmm2
movsd  -0xa8(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0xa8(%rbp)
ff
mov    -0x8(%rbp),%rax
movsd  0x78(%rax),%xmm0
movsd  %xmm0,-0x40(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x60(%rax),%xmm0
movsd  %xmm0,-0x48(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x68(%rax),%xmm0
movsd  %xmm0,-0x50(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x70(%rax),%xmm0
movsd  %xmm0,-0x58(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x78(%rax),%xmm0
movsd  %xmm0,-0x60(%rbp)
movsd  -0x40(%rbp),%xmm0
movsd  -0x48(%rbp),%xmm2
movsd  -0x98(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x98(%rbp)
ff
movsd  -0x40(%rbp),%xmm0
movsd  -0x50(%rbp),%xmm2
movsd  -0xa0(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0xa0(%rbp)
ff
movsd  -0x40(%rbp),%xmm0
movsd  -0x58(%rbp),%xmm2
movsd  -0xa8(%rbp),%xmm1
ff
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0xa8(%rbp)
ff
movsd  -0x40(%rbp),%xmm0
movsd  -0x60(%rbp),%xmm2
movsd  -0xb0(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0xb0(%rbp)
ff
movsd  -0x68(%rbp),%xmm0
mov    -0x18(%rbp),%rax
movsd  %xmm0,(%rax)
movsd  -0x70(%rbp),%xmm0
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x8(%rax)
movsd  -0x80(%rbp),%xmm0
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x10(%rax)
movsd  -0x98(%rbp),%xmm0
ff
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x18(%rax)
movsd  -0x78(%rbp),%xmm0
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x28(%rax)
movsd  -0x88(%rbp),%xmm0
ff
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x30(%rax)
movsd  -0xa0(%rbp),%xmm0
ff
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x38(%rax)
movsd  -0x90(%rbp),%xmm0
ff
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x50(%rax)
movsd  -0xa8(%rbp),%xmm0
ff
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x58(%rax)
movsd  -0xb0(%rbp),%xmm0
ff
mov    -0x18(%rbp),%rax
movsd  %xmm0,0x78(%rax)
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<corner_dttmm_ll_nt_4x4_lib4>:
movsd  (%rsi),%xmm0
movsd  0x8(%rdi),%xmm1
mulsd  %xmm0,%xmm1
xorpd  %xmm8,%xmm8
addsd  %xmm8,%xmm1
movsd  0x18(%rdi),%xmm4
mulsd  %xmm0,%xmm4
addsd  %xmm8,%xmm4
movsd  0x30(%rdi),%xmm12
movsd  0x38(%rdi),%xmm13
movsd  0x28(%rsi),%xmm6
movsd  (%rdi),%xmm11
movsd  0x10(%rdi),%xmm2
movsd  0x28(%rdi),%xmm10
unpcklpd %xmm10,%xmm11
movsd  0x20(%rsi),%xmm3
unpcklpd %xmm3,%xmm0
xorpd  %xmm9,%xmm9
xorpd  %xmm5,%xmm5
unpcklpd %xmm1,%xmm5
mulpd  %xmm0,%xmm11
addpd  %xmm5,%xmm11
unpcklpd %xmm13,%xmm2
xorpd  %xmm1,%xmm1
unpcklpd %xmm4,%xmm1
mulpd  %xmm0,%xmm2
addpd  %xmm1,%xmm2
movapd %xmm12,%xmm5
mulsd  %xmm6,%xmm5
addsd  %xmm8,%xmm5
mulsd  %xmm6,%xmm13
addsd  %xmm8,%xmm13
movsd  0x58(%rdi),%xmm0
movsd  0x48(%rsi),%xmm1
movsd  0x50(%rsi),%xmm4
unpcklpd %xmm0,%xmm12
movsd  0x40(%rsi),%xmm7
unpcklpd %xmm7,%xmm3
mulpd  %xmm12,%xmm3
addpd  %xmm2,%xmm3
movsd  0x50(%rdi),%xmm2
unpcklpd %xmm2,%xmm10
unpcklpd %xmm1,%xmm6
mulpd  %xmm10,%xmm6
xorpd  %xmm10,%xmm10
unpcklpd %xmm5,%xmm10
addpd  %xmm6,%xmm10
mulsd  %xmm0,%xmm1
addsd  %xmm13,%xmm1
mulsd  %xmm4,%xmm0
addsd  %xmm8,%xmm0
movsd  0x78(%rdi),%xmm5
movhpd 0x60(%rsi),%xmm7
unpcklpd %xmm5,%xmm2
mulpd  %xmm2,%xmm7
addpd  %xmm3,%xmm7
movsd  0x68(%rsi),%xmm3
mulsd  %xmm5,%xmm3
addsd  %xmm1,%xmm3
movhpd 0x70(%rsi),%xmm4
unpcklpd %xmm0,%xmm9
mulpd  %xmm2,%xmm4
mulsd  0x78(%rsi),%xmm5
addpd  %xmm9,%xmm4
addsd  %xmm8,%xmm5
movupd %xmm11,(%rdx)
movupd %xmm7,0x10(%rdx)
movupd %xmm10,0x28(%rdx)
movsd  %xmm3,0x38(%rdx)
movupd %xmm4,0x50(%rdx)
movsd  %xmm5,0x78(%rdx)
ret

LLVM IR (-O0):
define void @corner_dttmm_ll_nt_4x4_lib4(double* %0, double* %1, double* %2) {
%4 = alloca double*
%5 = alloca double*
%6 = alloca double*
%7 = alloca i32
%8 = alloca double
%9 = alloca double
%10 = alloca double
%11 = alloca double
%12 = alloca double
%13 = alloca double
%14 = alloca double
%15 = alloca double
%16 = alloca double
%17 = alloca double
%18 = alloca double
%19 = alloca double
%20 = alloca double
%21 = alloca double
%22 = alloca double
%23 = alloca double
%24 = alloca double
%25 = alloca double
store double* %0, double** %4
store double* %1, double** %5
store double* %2, double** %6
store i32 4, i32* %7
store double 0.000000e+00, double* %16
store double 0.000000e+00, double* %17
store double 0.000000e+00, double* %18
store double 0.000000e+00, double* %19
store double 0.000000e+00, double* %20
store double 0.000000e+00, double* %21
store double 0.000000e+00, double* %22
store double 0.000000e+00, double* %23
store double 0.000000e+00, double* %24
store double 0.000000e+00, double* %25
%26 = load double*, double** %4
%27 = getelementptr inbounds double, double* %26, i64 0
%28 = load double, double* %27
store double %28, double* %8
%29 = load double*, double** %4
%30 = getelementptr inbounds double, double* %29, i64 1
%31 = load double, double* %30
store double %31, double* %9
%32 = load double*, double** %4
%33 = getelementptr inbounds double, double* %32, i64 2
%34 = load double, double* %33
store double %34, double* %10
%35 = load double*, double** %4
%36 = getelementptr inbounds double, double* %35, i64 3
%37 = load double, double* %36
store double %37, double* %11
%38 = load double*, double** %5
%39 = getelementptr inbounds double, double* %38, i64 0
%40 = load double, double* %39
store double %40, double* %12
%41 = load double, double* %8
%42 = load double, double* %12
%43 = load double, double* %16
%44 = call double @llvm.fmuladd.f64(double %41, double %42, double %43)
store double %44, double* %16
%45 = load double, double* %9
%46 = load double, double* %12
%47 = load double, double* %17
%48 = call double @llvm.fmuladd.f64(double %45, double %46, double %47)
store double %48, double* %17
%49 = load double, double* %10
%50 = load double, double* %12
%51 = load double, double* %19
%52 = call double @llvm.fmuladd.f64(double %49, double %50, double %51)
store double %52, double* %19
%53 = load double, double* %11
%54 = load double, double* %12
%55 = load double, double* %22
%56 = call double @llvm.fmuladd.f64(double %53, double %54, double %55)
store double %56, double* %22
%57 = load double*, double** %4
%58 = getelementptr inbounds double, double* %57, i64 5
%59 = load double, double* %58
store double %59, double* %9
%60 = load double*, double** %4
%61 = getelementptr inbounds double, double* %60, i64 6
%62 = load double, double* %61
store double %62, double* %10
%63 = load double*, double** %4
%64 = getelementptr inbounds double, double* %63, i64 7
%65 = load double, double* %64
store double %65, double* %11
%66 = load double*, double** %5
%67 = getelementptr inbounds double, double* %66, i64 4
%68 = load double, double* %67
store double %68, double* %12
%69 = load double*, double** %5
%70 = getelementptr inbounds double, double* %69, i64 5
%71 = load double, double* %70
store double %71, double* %13
%72 = load double, double* %9
%73 = load double, double* %12
%74 = load double, double* %17
%75 = call double @llvm.fmuladd.f64(double %72, double %73, double %74)
store double %75, double* %17
%76 = load double, double* %10
%77 = load double, double* %12
%78 = load double, double* %19
%79 = call double @llvm.fmuladd.f64(double %76, double %77, double %78)
store double %79, double* %19
%80 = load double, double* %11
%81 = load double, double* %12
%82 = load double, double* %22
%83 = call double @llvm.fmuladd.f64(double %80, double %81, double %82)
store double %83, double* %22
%84 = load double, double* %9
%85 = load double, double* %13
%86 = load double, double* %18
%87 = call double @llvm.fmuladd.f64(double %84, double %85, double %86)
store double %87, double* %18
%88 = load double, double* %10
%89 = load double, double* %13
%90 = load double, double* %20
%91 = call double @llvm.fmuladd.f64(double %88, double %89, double %90)
store double %91, double* %20
%92 = load double, double* %11
%93 = load double, double* %13
%94 = load double, double* %23
%95 = call double @llvm.fmuladd.f64(double %92, double %93, double %94)
store double %95, double* %23
%96 = load double*, double** %4
%97 = getelementptr inbounds double, double* %96, i64 10
%98 = load double, double* %97
store double %98, double* %10
%99 = load double*, double** %4
%100 = getelementptr inbounds double, double* %99, i64 11
%101 = load double, double* %100
store double %101, double* %11
%102 = load double*, double** %5
%103 = getelementptr inbounds double, double* %102, i64 8
%104 = load double, double* %103
store double %104, double* %12
%105 = load double*, double** %5
%106 = getelementptr inbounds double, double* %105, i64 9
%107 = load double, double* %106
store double %107, double* %13
%108 = load double*, double** %5
%109 = getelementptr inbounds double, double* %108, i64 10
%110 = load double, double* %109
store double %110, double* %14
%111 = load double, double* %10
%112 = load double, double* %12
%113 = load double, double* %19
%114 = call double @llvm.fmuladd.f64(double %111, double %112, double %113)
store double %114, double* %19
%115 = load double, double* %11
%116 = load double, double* %12
%117 = load double, double* %22
%118 = call double @llvm.fmuladd.f64(double %115, double %116, double %117)
store double %118, double* %22
%119 = load double, double* %10
%120 = load double, double* %13
%121 = load double, double* %20
%122 = call double @llvm.fmuladd.f64(double %119, double %120, double %121)
store double %122, double* %20
%123 = load double, double* %11
%124 = load double, double* %13
%125 = load double, double* %23
%126 = call double @llvm.fmuladd.f64(double %123, double %124, double %125)
store double %126, double* %23
%127 = load double, double* %10
%128 = load double, double* %14
%129 = load double, double* %21
%130 = call double @llvm.fmuladd.f64(double %127, double %128, double %129)
store double %130, double* %21
%131 = load double, double* %11
%132 = load double, double* %14
%133 = load double, double* %24
%134 = call double @llvm.fmuladd.f64(double %131, double %132, double %133)
store double %134, double* %24
%135 = load double*, double** %4
%136 = getelementptr inbounds double, double* %135, i64 15
%137 = load double, double* %136
store double %137, double* %11
%138 = load double*, double** %5
%139 = getelementptr inbounds double, double* %138, i64 12
%140 = load double, double* %139
store double %140, double* %12
%141 = load double*, double** %5
%142 = getelementptr inbounds double, double* %141, i64 13
%143 = load double, double* %142
store double %143, double* %13
%144 = load double*, double** %5
%145 = getelementptr inbounds double, double* %144, i64 14
%146 = load double, double* %145
store double %146, double* %14
%147 = load double*, double** %5
%148 = getelementptr inbounds double, double* %147, i64 15
%149 = load double, double* %148
store double %149, double* %15
%150 = load double, double* %11
%151 = load double, double* %12
%152 = load double, double* %22
%153 = call double @llvm.fmuladd.f64(double %150, double %151, double %152)
store double %153, double* %22
%154 = load double, double* %11
%155 = load double, double* %13
%156 = load double, double* %23
%157 = call double @llvm.fmuladd.f64(double %154, double %155, double %156)
store double %157, double* %23
%158 = load double, double* %11
%159 = load double, double* %14
%160 = load double, double* %24
%161 = call double @llvm.fmuladd.f64(double %158, double %159, double %160)
store double %161, double* %24
%162 = load double, double* %11
%163 = load double, double* %15
%164 = load double, double* %25
%165 = call double @llvm.fmuladd.f64(double %162, double %163, double %164)
store double %165, double* %25
%166 = load double, double* %16
%167 = load double*, double** %6
%168 = getelementptr inbounds double, double* %167, i64 0
store double %166, double* %168
%169 = load double, double* %17
%170 = load double*, double** %6
%171 = getelementptr inbounds double, double* %170, i64 1
store double %169, double* %171
%172 = load double, double* %19
%173 = load double*, double** %6
%174 = getelementptr inbounds double, double* %173, i64 2
store double %172, double* %174
%175 = load double, double* %22
%176 = load double*, double** %6
%177 = getelementptr inbounds double, double* %176, i64 3
store double %175, double* %177
%178 = load double, double* %18
%179 = load double*, double** %6
%180 = getelementptr inbounds double, double* %179, i64 5
store double %178, double* %180
%181 = load double, double* %20
%182 = load double*, double** %6
%183 = getelementptr inbounds double, double* %182, i64 6
store double %181, double* %183
%184 = load double, double* %23
%185 = load double*, double** %6
%186 = getelementptr inbounds double, double* %185, i64 7
store double %184, double* %186
%187 = load double, double* %21
%188 = load double*, double** %6
%189 = getelementptr inbounds double, double* %188, i64 10
store double %187, double* %189
%190 = load double, double* %24
%191 = load double*, double** %6
%192 = getelementptr inbounds double, double* %191, i64 11
store double %190, double* %192
%193 = load double, double* %25
%194 = load double*, double** %6
%195 = getelementptr inbounds double, double* %194, i64 15
store double %193, double* %195
ret void
}

LLVM IR (-O2):
define void @corner_dttmm_ll_nt_4x4_lib4(double* nocapture %0, double* nocapture %1, double* nocapture writeonly %2) {
%4 = load double, double* %0
%5 = getelementptr inbounds double, double* %0, i64 1
%6 = load double, double* %5
%7 = getelementptr inbounds double, double* %0, i64 2
%8 = load double, double* %7
%9 = getelementptr inbounds double, double* %0, i64 3
%10 = load double, double* %9
%11 = load double, double* %1
%12 = tail call double @llvm.fmuladd.f64(double %6, double %11, double 0.000000e+00)
%13 = tail call double @llvm.fmuladd.f64(double %10, double %11, double 0.000000e+00)
%14 = getelementptr inbounds double, double* %0, i64 5
%15 = load double, double* %14
%16 = getelementptr inbounds double, double* %0, i64 6
%17 = load double, double* %16
%18 = getelementptr inbounds double, double* %0, i64 7
%19 = load double, double* %18
%20 = getelementptr inbounds double, double* %1, i64 4
%21 = load double, double* %20
%22 = getelementptr inbounds double, double* %1, i64 5
%23 = load double, double* %22
%24 = insertelement <2 x double> poison, double %4, i64 0
%25 = insertelement <2 x double> %24, double %15, i64 1
%26 = insertelement <2 x double> poison, double %11, i64 0
%27 = insertelement <2 x double> %26, double %21, i64 1
%28 = insertelement <2 x double> <double 0.000000e+00, double poison>, double %12, i64 1
%29 = call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %25, <2 x double> %27, <2 x double> %28)
%30 = insertelement <2 x double> poison, double %8, i64 0
%31 = insertelement <2 x double> %30, double %19, i64 1
%32 = insertelement <2 x double> <double 0.000000e+00, double poison>, double %13, i64 1
%33 = call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %31, <2 x double> %27, <2 x double> %32)
%34 = tail call double @llvm.fmuladd.f64(double %17, double %23, double 0.000000e+00)
%35 = tail call double @llvm.fmuladd.f64(double %19, double %23, double 0.000000e+00)
%36 = getelementptr inbounds double, double* %0, i64 10
%37 = load double, double* %36
%38 = getelementptr inbounds double, double* %0, i64 11
%39 = load double, double* %38
%40 = getelementptr inbounds double, double* %1, i64 8
%41 = load double, double* %40
%42 = getelementptr inbounds double, double* %1, i64 9
%43 = load double, double* %42
%44 = getelementptr inbounds double, double* %1, i64 10
%45 = load double, double* %44
%46 = insertelement <2 x double> poison, double %17, i64 0
%47 = insertelement <2 x double> %46, double %39, i64 1
%48 = insertelement <2 x double> poison, double %21, i64 0
%49 = insertelement <2 x double> %48, double %41, i64 1
%50 = call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %47, <2 x double> %49, <2 x double> %33)
%51 = insertelement <2 x double> poison, double %15, i64 0
%52 = insertelement <2 x double> %51, double %37, i64 1
%53 = insertelement <2 x double> poison, double %23, i64 0
%54 = insertelement <2 x double> %53, double %43, i64 1
%55 = insertelement <2 x double> <double 0.000000e+00, double poison>, double %34, i64 1
%56 = call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %52, <2 x double> %54, <2 x double> %55)
%57 = tail call double @llvm.fmuladd.f64(double %39, double %43, double %35)
%58 = tail call double @llvm.fmuladd.f64(double %39, double %45, double 0.000000e+00)
%59 = getelementptr inbounds double, double* %0, i64 15
%60 = load double, double* %59
%61 = getelementptr inbounds double, double* %1, i64 12
%62 = load double, double* %61
%63 = getelementptr inbounds double, double* %1, i64 13
%64 = load double, double* %63
%65 = getelementptr inbounds double, double* %1, i64 14
%66 = load double, double* %65
%67 = getelementptr inbounds double, double* %1, i64 15
%68 = load double, double* %67
%69 = insertelement <2 x double> poison, double %37, i64 0
%70 = insertelement <2 x double> %69, double %60, i64 1
%71 = insertelement <2 x double> poison, double %41, i64 0
%72 = insertelement <2 x double> %71, double %62, i64 1
%73 = call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %70, <2 x double> %72, <2 x double> %50)
%74 = tail call double @llvm.fmuladd.f64(double %60, double %64, double %57)
%75 = insertelement <2 x double> poison, double %45, i64 0
%76 = insertelement <2 x double> %75, double %66, i64 1
%77 = insertelement <2 x double> <double 0.000000e+00, double poison>, double %58, i64 1
%78 = call <2 x double> @llvm.fmuladd.v2f64(<2 x double> %70, <2 x double> %76, <2 x double> %77)
%79 = tail call double @llvm.fmuladd.f64(double %60, double %68, double 0.000000e+00)
%80 = bitcast double* %2 to <2 x double>*
store <2 x double> %29, <2 x double>* %80
%81 = getelementptr inbounds double, double* %2, i64 2
%82 = bitcast double* %81 to <2 x double>*
store <2 x double> %73, <2 x double>* %82
%83 = getelementptr inbounds double, double* %2, i64 5
%84 = bitcast double* %83 to <2 x double>*
store <2 x double> %56, <2 x double>* %84
%85 = getelementptr inbounds double, double* %2, i64 7
store double %74, double* %85
%86 = getelementptr inbounds double, double* %2, i64 10
%87 = bitcast double* %86 to <2 x double>*
store <2 x double> %78, <2 x double>* %87
%88 = getelementptr inbounds double, double* %2, i64 15
store double %79, double* %88
ret void
}