void fft8pt(float *ioptr) {
  float w0r = 1.0 / 1.414213562373095048801688724209698078569;
  float f0r, f0i, f1r, f1i, f2r, f2i, f3r, f3i;
  float f4r, f4i, f5r, f5i, f6r, f6i, f7r, f7i;
  float t0r, t0i, t1r, t1i;
  const float Two = 2.0;
  f0r = ioptr[0];
  f0i = ioptr[1];
  f1r = ioptr[8];
  f1i = ioptr[9];
  f2r = ioptr[4];
  f2i = ioptr[5];
  f3r = ioptr[12];
  f3i = ioptr[13];
  f4r = ioptr[2];
  f4i = ioptr[3];
  f5r = ioptr[10];
  f5i = ioptr[11];
  f6r = ioptr[6];
  f6i = ioptr[7];
  f7r = ioptr[14];
  f7i = ioptr[15];
  t0r = f0r + f1r;
  t0i = f0i + f1i;
  f1r = f0r - f1r;
  f1i = f0i - f1i;
  t1r = f2r - f3r;
  t1i = f2i - f3i;
  f2r = f2r + f3r;
  f2i = f2i + f3i;
  f0r = t0r + f2r;
  f0i = t0i + f2i;
  f2r = t0r - f2r;
  f2i = t0i - f2i;
  f3r = f1r - t1i;
  f3i = f1i + t1r;
  f1r = f1r + t1i;
  f1i = f1i - t1r;
  t0r = f4r + f5r;
  t0i = f4i + f5i;
  f5r = f4r - f5r;
  f5i = f4i - f5i;
  t1r = f6r - f7r;
  t1i = f6i - f7i;
  f6r = f6r + f7r;
  f6i = f6i + f7i;
  f4r = t0r + f6r;
  f4i = t0i + f6i;
  f6r = t0r - f6r;
  f6i = t0i - f6i;
  f7r = f5r - t1i;
  f7i = f5i + t1r;
  f5r = f5r + t1i;
  f5i = f5i - t1r;
  t0r = f0r - f4r;
  t0i = f0i - f4i;
  f0r = f0r + f4r;
  f0i = f0i + f4i;
  t1r = f2r - f6i;
  t1i = f2i + f6r;
  f2r = f2r + f6i;
  f2i = f2i - f6r;
  f4r = f1r - f5r * w0r - f5i * w0r;
  f4i = f1i + f5r * w0r - f5i * w0r;
  f1r = f1r * Two - f4r;
  f1i = f1i * Two - f4i;
  f6r = f3r + f7r * w0r - f7i * w0r;
  f6i = f3i + f7r * w0r + f7i * w0r;
  f3r = f3r * Two - f6r;
  f3i = f3i * Two - f6i;
  ioptr[0] = f0r;
  ioptr[1] = f0i;
  ioptr[2] = f1r;
  ioptr[3] = f1i;
  ioptr[4] = f2r;
  ioptr[5] = f2i;
  ioptr[6] = f3r;
  ioptr[7] = f3i;
  ioptr[8] = t0r;
  ioptr[9] = t0i;
  ioptr[10] = f4r;
  ioptr[11] = f4i;
  ioptr[12] = t1r;
  ioptr[13] = t1i;
  ioptr[14] = f6r;
  ioptr[15] = f6i;
}


x86 assembly (clang, -O0):
<fft8pt>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x8(%rbp)
movss  0xef4(%rip),%xmm0
movss  %xmm0,-0xc(%rbp)
movss  0xee3(%rip),%xmm0
movss  %xmm0,-0x60(%rbp)
mov    -0x8(%rbp),%rax
movss  (%rax),%xmm0
movss  %xmm0,-0x10(%rbp)
mov    -0x8(%rbp),%rax
movss  0x4(%rax),%xmm0
movss  %xmm0,-0x14(%rbp)
mov    -0x8(%rbp),%rax
movss  0x20(%rax),%xmm0
movss  %xmm0,-0x18(%rbp)
mov    -0x8(%rbp),%rax
movss  0x24(%rax),%xmm0
movss  %xmm0,-0x1c(%rbp)
mov    -0x8(%rbp),%rax
movss  0x10(%rax),%xmm0
movss  %xmm0,-0x20(%rbp)
mov    -0x8(%rbp),%rax
movss  0x14(%rax),%xmm0
movss  %xmm0,-0x24(%rbp)
mov    -0x8(%rbp),%rax
movss  0x30(%rax),%xmm0
movss  %xmm0,-0x28(%rbp)
mov    -0x8(%rbp),%rax
movss  0x34(%rax),%xmm0
movss  %xmm0,-0x2c(%rbp)
mov    -0x8(%rbp),%rax
movss  0x8(%rax),%xmm0
movss  %xmm0,-0x30(%rbp)
mov    -0x8(%rbp),%rax
movss  0xc(%rax),%xmm0
movss  %xmm0,-0x34(%rbp)
mov    -0x8(%rbp),%rax
movss  0x28(%rax),%xmm0
movss  %xmm0,-0x38(%rbp)
mov    -0x8(%rbp),%rax
movss  0x2c(%rax),%xmm0
movss  %xmm0,-0x3c(%rbp)
mov    -0x8(%rbp),%rax
movss  0x18(%rax),%xmm0
movss  %xmm0,-0x40(%rbp)
mov    -0x8(%rbp),%rax
movss  0x1c(%rax),%xmm0
movss  %xmm0,-0x44(%rbp)
mov    -0x8(%rbp),%rax
movss  0x38(%rax),%xmm0
movss  %xmm0,-0x48(%rbp)
mov    -0x8(%rbp),%rax
movss  0x3c(%rax),%xmm0
movss  %xmm0,-0x4c(%rbp)
movss  -0x10(%rbp),%xmm0
addss  -0x18(%rbp),%xmm0
movss  %xmm0,-0x50(%rbp)
movss  -0x14(%rbp),%xmm0
addss  -0x1c(%rbp),%xmm0
movss  %xmm0,-0x54(%rbp)
movss  -0x10(%rbp),%xmm0
subss  -0x18(%rbp),%xmm0
movss  %xmm0,-0x18(%rbp)
movss  -0x14(%rbp),%xmm0
subss  -0x1c(%rbp),%xmm0
movss  %xmm0,-0x1c(%rbp)
movss  -0x20(%rbp),%xmm0
subss  -0x28(%rbp),%xmm0
movss  %xmm0,-0x58(%rbp)
movss  -0x24(%rbp),%xmm0
subss  -0x2c(%rbp),%xmm0
movss  %xmm0,-0x5c(%rbp)
movss  -0x20(%rbp),%xmm0
addss  -0x28(%rbp),%xmm0
movss  %xmm0,-0x20(%rbp)
movss  -0x24(%rbp),%xmm0
addss  -0x2c(%rbp),%xmm0
movss  %xmm0,-0x24(%rbp)
movss  -0x50(%rbp),%xmm0
addss  -0x20(%rbp),%xmm0
movss  %xmm0,-0x10(%rbp)
movss  -0x54(%rbp),%xmm0
addss  -0x24(%rbp),%xmm0
movss  %xmm0,-0x14(%rbp)
movss  -0x50(%rbp),%xmm0
subss  -0x20(%rbp),%xmm0
movss  %xmm0,-0x20(%rbp)
movss  -0x54(%rbp),%xmm0
subss  -0x24(%rbp),%xmm0
movss  %xmm0,-0x24(%rbp)
movss  -0x18(%rbp),%xmm0
subss  -0x5c(%rbp),%xmm0
movss  %xmm0,-0x28(%rbp)
movss  -0x1c(%rbp),%xmm0
addss  -0x58(%rbp),%xmm0
movss  %xmm0,-0x2c(%rbp)
movss  -0x18(%rbp),%xmm0
addss  -0x5c(%rbp),%xmm0
movss  %xmm0,-0x18(%rbp)
movss  -0x1c(%rbp),%xmm0
subss  -0x58(%rbp),%xmm0
movss  %xmm0,-0x1c(%rbp)
movss  -0x30(%rbp),%xmm0
addss  -0x38(%rbp),%xmm0
movss  %xmm0,-0x50(%rbp)
movss  -0x34(%rbp),%xmm0
addss  -0x3c(%rbp),%xmm0
movss  %xmm0,-0x54(%rbp)
movss  -0x30(%rbp),%xmm0
subss  -0x38(%rbp),%xmm0
movss  %xmm0,-0x38(%rbp)
movss  -0x34(%rbp),%xmm0
subss  -0x3c(%rbp),%xmm0
movss  %xmm0,-0x3c(%rbp)
movss  -0x40(%rbp),%xmm0
subss  -0x48(%rbp),%xmm0
movss  %xmm0,-0x58(%rbp)
movss  -0x44(%rbp),%xmm0
subss  -0x4c(%rbp),%xmm0
movss  %xmm0,-0x5c(%rbp)
movss  -0x40(%rbp),%xmm0
addss  -0x48(%rbp),%xmm0
movss  %xmm0,-0x40(%rbp)
movss  -0x44(%rbp),%xmm0
addss  -0x4c(%rbp),%xmm0
movss  %xmm0,-0x44(%rbp)
movss  -0x50(%rbp),%xmm0
addss  -0x40(%rbp),%xmm0
movss  %xmm0,-0x30(%rbp)
movss  -0x54(%rbp),%xmm0
addss  -0x44(%rbp),%xmm0
movss  %xmm0,-0x34(%rbp)
movss  -0x50(%rbp),%xmm0
subss  -0x40(%rbp),%xmm0
movss  %xmm0,-0x40(%rbp)
movss  -0x54(%rbp),%xmm0
subss  -0x44(%rbp),%xmm0
movss  %xmm0,-0x44(%rbp)
movss  -0x38(%rbp),%xmm0
subss  -0x5c(%rbp),%xmm0
movss  %xmm0,-0x48(%rbp)
movss  -0x3c(%rbp),%xmm0
addss  -0x58(%rbp),%xmm0
movss  %xmm0,-0x4c(%rbp)
movss  -0x38(%rbp),%xmm0
addss  -0x5c(%rbp),%xmm0
movss  %xmm0,-0x38(%rbp)
movss  -0x3c(%rbp),%xmm0
subss  -0x58(%rbp),%xmm0
movss  %xmm0,-0x3c(%rbp)
movss  -0x10(%rbp),%xmm0
subss  -0x30(%rbp),%xmm0
movss  %xmm0,-0x50(%rbp)
movss  -0x14(%rbp),%xmm0
subss  -0x34(%rbp),%xmm0
movss  %xmm0,-0x54(%rbp)
movss  -0x10(%rbp),%xmm0
addss  -0x30(%rbp),%xmm0
movss  %xmm0,-0x10(%rbp)
movss  -0x14(%rbp),%xmm0
addss  -0x34(%rbp),%xmm0
movss  %xmm0,-0x14(%rbp)
movss  -0x20(%rbp),%xmm0
subss  -0x44(%rbp),%xmm0
movss  %xmm0,-0x58(%rbp)
movss  -0x24(%rbp),%xmm0
addss  -0x40(%rbp),%xmm0
movss  %xmm0,-0x5c(%rbp)
movss  -0x20(%rbp),%xmm0
addss  -0x44(%rbp),%xmm0
movss  %xmm0,-0x20(%rbp)
movss  -0x24(%rbp),%xmm0
subss  -0x40(%rbp),%xmm0
movss  %xmm0,-0x24(%rbp)
movss  -0x18(%rbp),%xmm0
movss  -0x38(%rbp),%xmm1
movss  -0xc(%rbp),%xmm2
movd   %xmm1,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm1
mulss  %xmm2,%xmm1
addss  %xmm0,%xmm1
movss  -0x3c(%rbp),%xmm0
movss  -0xc(%rbp),%xmm2
movd   %xmm0,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm0
mulss  %xmm2,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x30(%rbp)
movss  -0x1c(%rbp),%xmm0
movss  -0x38(%rbp),%xmm1
movss  -0xc(%rbp),%xmm2
mulss  %xmm2,%xmm1
addss  %xmm0,%xmm1
movss  -0x3c(%rbp),%xmm0
movss  -0xc(%rbp),%xmm2
movd   %xmm0,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm0
mulss  %xmm2,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x34(%rbp)
movss  -0x18(%rbp),%xmm0
movss  -0x30(%rbp),%xmm1
movd   %xmm1,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm1
addss  %xmm0,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x18(%rbp)
movss  -0x1c(%rbp),%xmm0
movss  -0x34(%rbp),%xmm1
movd   %xmm1,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm1
addss  %xmm0,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x1c(%rbp)
movss  -0x28(%rbp),%xmm0
movss  -0x48(%rbp),%xmm1
movss  -0xc(%rbp),%xmm2
mulss  %xmm2,%xmm1
addss  %xmm0,%xmm1
movss  -0x4c(%rbp),%xmm0
movss  -0xc(%rbp),%xmm2
movd   %xmm0,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm0
mulss  %xmm2,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x40(%rbp)
movss  -0x2c(%rbp),%xmm0
movss  -0x48(%rbp),%xmm1
movss  -0xc(%rbp),%xmm2
mulss  %xmm2,%xmm1
addss  %xmm0,%xmm1
movss  -0x4c(%rbp),%xmm0
movss  -0xc(%rbp),%xmm2
mulss  %xmm2,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x44(%rbp)
movss  -0x28(%rbp),%xmm0
movss  -0x40(%rbp),%xmm1
movd   %xmm1,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm1
addss  %xmm0,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x28(%rbp)
movss  -0x2c(%rbp),%xmm0
movss  -0x44(%rbp),%xmm1
movd   %xmm1,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm1
addss  %xmm0,%xmm0
addss  %xmm1,%xmm0
movss  %xmm0,-0x2c(%rbp)
movss  -0x10(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,(%rax)
movss  -0x14(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x4(%rax)
movss  -0x18(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x8(%rax)
movss  -0x1c(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0xc(%rax)
movss  -0x20(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x10(%rax)
movss  -0x24(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x14(%rax)
movss  -0x28(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x18(%rax)
movss  -0x2c(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x1c(%rax)
movss  -0x50(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x20(%rax)
movss  -0x54(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x24(%rax)
movss  -0x30(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x28(%rax)
movss  -0x34(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x2c(%rax)
movss  -0x58(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x30(%rax)
movss  -0x5c(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x34(%rax)
movss  -0x40(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x38(%rax)
movss  -0x44(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x3c(%rax)
pop    %rbp
ret

x86 assembly (clang, -O2):
<fft8pt>:
movss  (%rdi),%xmm11
movss  0x4(%rdi),%xmm8
movss  0x20(%rdi),%xmm0
movss  0x24(%rdi),%xmm2
movss  0x10(%rdi),%xmm9
movss  0x14(%rdi),%xmm7
movss  0x30(%rdi),%xmm6
movss  0x34(%rdi),%xmm12
movss  0x8(%rdi),%xmm1
movss  %xmm1,-0xc(%rsp)
movss  0xc(%rdi),%xmm4
movss  0x28(%rdi),%xmm15
movss  0x2c(%rdi),%xmm5
movss  0x18(%rdi),%xmm3
movss  0x1c(%rdi),%xmm1
movss  0x38(%rdi),%xmm10
movaps %xmm11,%xmm13
addss  %xmm0,%xmm13
subss  %xmm0,%xmm11
movaps %xmm8,%xmm14
addss  %xmm2,%xmm14
subss  %xmm2,%xmm8
movaps %xmm9,%xmm2
subss  %xmm6,%xmm2
addss  %xmm6,%xmm9
movaps %xmm7,%xmm6
subss  %xmm12,%xmm6
addss  %xmm12,%xmm7
movaps %xmm13,%xmm0
addss  %xmm9,%xmm0
movss  %xmm0,-0x4(%rsp)
subss  %xmm9,%xmm13
movaps %xmm14,%xmm0
addss  %xmm7,%xmm0
movss  %xmm0,-0x8(%rsp)
subss  %xmm7,%xmm14
movaps %xmm11,%xmm12
subss  %xmm6,%xmm12
addss  %xmm11,%xmm6
movaps %xmm8,%xmm11
addss  %xmm2,%xmm11
subss  %xmm2,%xmm8
movss  -0xc(%rsp),%xmm0
movaps %xmm0,%xmm2
addss  %xmm15,%xmm2
subss  %xmm15,%xmm0
movss  %xmm0,-0xc(%rsp)
movaps %xmm4,%xmm15
addss  %xmm5,%xmm15
subss  %xmm5,%xmm4
movaps %xmm3,%xmm5
subss  %xmm10,%xmm5
addss  %xmm10,%xmm3
movss  0x3c(%rdi),%xmm0
movaps %xmm1,%xmm7
subss  %xmm0,%xmm7
addss  %xmm0,%xmm1
movaps %xmm2,%xmm10
addss  %xmm3,%xmm10
subss  %xmm3,%xmm2
movaps %xmm15,%xmm9
addss  %xmm1,%xmm9
subss  %xmm1,%xmm15
movss  -0xc(%rsp),%xmm0
movaps %xmm0,%xmm1
subss  %xmm7,%xmm1
addss  %xmm0,%xmm7
movaps %xmm4,%xmm3
addss  %xmm5,%xmm3
subss  %xmm5,%xmm4
movss  -0x4(%rsp),%xmm0
movaps %xmm0,%xmm5
subss  %xmm10,%xmm5
movss  %xmm5,-0xc(%rsp)
addss  %xmm0,%xmm10
movss  -0x8(%rsp),%xmm0
movaps %xmm0,%xmm5
subss  %xmm9,%xmm5
movss  %xmm5,-0x4(%rsp)
addss  %xmm0,%xmm9
movaps %xmm13,%xmm0
subss  %xmm15,%xmm0
movss  %xmm0,-0x8(%rsp)
addss  %xmm13,%xmm15
movaps %xmm14,%xmm13
addss  %xmm2,%xmm13
subss  %xmm2,%xmm14
movss  0xd5b(%rip),%xmm5
mulss  %xmm5,%xmm7
movaps %xmm6,%xmm2
subss  %xmm7,%xmm2
xorps  0xd59(%rip),%xmm4
mulss  %xmm5,%xmm4
addss  %xmm4,%xmm2
addss  %xmm8,%xmm7
addss  %xmm4,%xmm7
mulss  %xmm5,%xmm1
mulss  %xmm5,%xmm3
movaps %xmm1,%xmm4
addss  %xmm12,%xmm4
subss  %xmm3,%xmm4
addss  %xmm11,%xmm1
addss  %xmm3,%xmm1
movss  %xmm10,(%rdi)
movss  %xmm9,0x4(%rdi)
addss  %xmm6,%xmm6
subss  %xmm2,%xmm6
movss  %xmm6,0x8(%rdi)
addss  %xmm8,%xmm8
subss  %xmm7,%xmm8
movss  %xmm8,0xc(%rdi)
movss  %xmm15,0x10(%rdi)
movss  %xmm14,0x14(%rdi)
addss  %xmm12,%xmm12
subss  %xmm4,%xmm12
movss  %xmm12,0x18(%rdi)
addss  %xmm11,%xmm11
subss  %xmm1,%xmm11
movss  %xmm11,0x1c(%rdi)
movss  -0xc(%rsp),%xmm0
movss  %xmm0,0x20(%rdi)
movss  -0x4(%rsp),%xmm0
movss  %xmm0,0x24(%rdi)
movss  %xmm2,0x28(%rdi)
movss  %xmm7,0x2c(%rdi)
movss  -0x8(%rsp),%xmm0
movss  %xmm0,0x30(%rdi)
movss  %xmm13,0x34(%rdi)
movss  %xmm4,0x38(%rdi)
movss  %xmm1,0x3c(%rdi)
ret

LLVM IR (-O0):
define void @fft8pt(float* %0) {
%2 = alloca float*
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = alloca float
%7 = alloca float
%8 = alloca float
%9 = alloca float
%10 = alloca float
%11 = alloca float
%12 = alloca float
%13 = alloca float
%14 = alloca float
%15 = alloca float
%16 = alloca float
%17 = alloca float
%18 = alloca float
%19 = alloca float
%20 = alloca float
%21 = alloca float
%22 = alloca float
%23 = alloca float
%24 = alloca float
store float* %0, float** %2
store float 0x3FE6A09E60000000, float* %3
store float 2.000000e+00, float* %24
%25 = load float*, float** %2
%26 = getelementptr inbounds float, float* %25, i64 0
%27 = load float, float* %26
store float %27, float* %4
%28 = load float*, float** %2
%29 = getelementptr inbounds float, float* %28, i64 1
%30 = load float, float* %29
store float %30, float* %5
%31 = load float*, float** %2
%32 = getelementptr inbounds float, float* %31, i64 8
%33 = load float, float* %32
store float %33, float* %6
%34 = load float*, float** %2
%35 = getelementptr inbounds float, float* %34, i64 9
%36 = load float, float* %35
store float %36, float* %7
%37 = load float*, float** %2
%38 = getelementptr inbounds float, float* %37, i64 4
%39 = load float, float* %38
store float %39, float* %8
%40 = load float*, float** %2
%41 = getelementptr inbounds float, float* %40, i64 5
%42 = load float, float* %41
store float %42, float* %9
%43 = load float*, float** %2
%44 = getelementptr inbounds float, float* %43, i64 12
%45 = load float, float* %44
store float %45, float* %10
%46 = load float*, float** %2
%47 = getelementptr inbounds float, float* %46, i64 13
%48 = load float, float* %47
store float %48, float* %11
%49 = load float*, float** %2
%50 = getelementptr inbounds float, float* %49, i64 2
%51 = load float, float* %50
store float %51, float* %12
%52 = load float*, float** %2
%53 = getelementptr inbounds float, float* %52, i64 3
%54 = load float, float* %53
store float %54, float* %13
%55 = load float*, float** %2
%56 = getelementptr inbounds float, float* %55, i64 10
%57 = load float, float* %56
store float %57, float* %14
%58 = load float*, float** %2
%59 = getelementptr inbounds float, float* %58, i64 11
%60 = load float, float* %59
store float %60, float* %15
%61 = load float*, float** %2
%62 = getelementptr inbounds float, float* %61, i64 6
%63 = load float, float* %62
store float %63, float* %16
%64 = load float*, float** %2
%65 = getelementptr inbounds float, float* %64, i64 7
%66 = load float, float* %65
store float %66, float* %17
%67 = load float*, float** %2
%68 = getelementptr inbounds float, float* %67, i64 14
%69 = load float, float* %68
store float %69, float* %18
%70 = load float*, float** %2
%71 = getelementptr inbounds float, float* %70, i64 15
%72 = load float, float* %71
store float %72, float* %19
%73 = load float, float* %4
%74 = load float, float* %6
%75 = fadd float %73, %74
store float %75, float* %20
%76 = load float, float* %5
%77 = load float, float* %7
%78 = fadd float %76, %77
store float %78, float* %21
%79 = load float, float* %4
%80 = load float, float* %6
%81 = fsub float %79, %80
store float %81, float* %6
%82 = load float, float* %5
%83 = load float, float* %7
%84 = fsub float %82, %83
store float %84, float* %7
%85 = load float, float* %8
%86 = load float, float* %10
%87 = fsub float %85, %86
store float %87, float* %22
%88 = load float, float* %9
%89 = load float, float* %11
%90 = fsub float %88, %89
store float %90, float* %23
%91 = load float, float* %8
%92 = load float, float* %10
%93 = fadd float %91, %92
store float %93, float* %8
%94 = load float, float* %9
%95 = load float, float* %11
%96 = fadd float %94, %95
store float %96, float* %9
%97 = load float, float* %20
%98 = load float, float* %8
%99 = fadd float %97, %98
store float %99, float* %4
%100 = load float, float* %21
%101 = load float, float* %9
%102 = fadd float %100, %101
store float %102, float* %5
%103 = load float, float* %20
%104 = load float, float* %8
%105 = fsub float %103, %104
store float %105, float* %8
%106 = load float, float* %21
%107 = load float, float* %9
%108 = fsub float %106, %107
store float %108, float* %9
%109 = load float, float* %6
%110 = load float, float* %23
%111 = fsub float %109, %110
store float %111, float* %10
%112 = load float, float* %7
%113 = load float, float* %22
%114 = fadd float %112, %113
store float %114, float* %11
%115 = load float, float* %6
%116 = load float, float* %23
%117 = fadd float %115, %116
store float %117, float* %6
%118 = load float, float* %7
%119 = load float, float* %22
%120 = fsub float %118, %119
store float %120, float* %7
%121 = load float, float* %12
%122 = load float, float* %14
%123 = fadd float %121, %122
store float %123, float* %20
%124 = load float, float* %13
%125 = load float, float* %15
%126 = fadd float %124, %125
store float %126, float* %21
%127 = load float, float* %12
%128 = load float, float* %14
%129 = fsub float %127, %128
store float %129, float* %14
%130 = load float, float* %13
%131 = load float, float* %15
%132 = fsub float %130, %131
store float %132, float* %15
%133 = load float, float* %16
%134 = load float, float* %18
%135 = fsub float %133, %134
store float %135, float* %22
%136 = load float, float* %17
%137 = load float, float* %19
%138 = fsub float %136, %137
store float %138, float* %23
%139 = load float, float* %16
%140 = load float, float* %18
%141 = fadd float %139, %140
store float %141, float* %16
%142 = load float, float* %17
%143 = load float, float* %19
%144 = fadd float %142, %143
store float %144, float* %17
%145 = load float, float* %20
%146 = load float, float* %16
%147 = fadd float %145, %146
store float %147, float* %12
%148 = load float, float* %21
%149 = load float, float* %17
%150 = fadd float %148, %149
store float %150, float* %13
%151 = load float, float* %20
%152 = load float, float* %16
%153 = fsub float %151, %152
store float %153, float* %16
%154 = load float, float* %21
%155 = load float, float* %17
%156 = fsub float %154, %155
store float %156, float* %17
%157 = load float, float* %14
%158 = load float, float* %23
%159 = fsub float %157, %158
store float %159, float* %18
%160 = load float, float* %15
%161 = load float, float* %22
%162 = fadd float %160, %161
store float %162, float* %19
%163 = load float, float* %14
%164 = load float, float* %23
%165 = fadd float %163, %164
store float %165, float* %14
%166 = load float, float* %15
%167 = load float, float* %22
%168 = fsub float %166, %167
store float %168, float* %15
%169 = load float, float* %4
%170 = load float, float* %12
%171 = fsub float %169, %170
store float %171, float* %20
%172 = load float, float* %5
%173 = load float, float* %13
%174 = fsub float %172, %173
store float %174, float* %21
%175 = load float, float* %4
%176 = load float, float* %12
%177 = fadd float %175, %176
store float %177, float* %4
%178 = load float, float* %5
%179 = load float, float* %13
%180 = fadd float %178, %179
store float %180, float* %5
%181 = load float, float* %8
%182 = load float, float* %17
%183 = fsub float %181, %182
store float %183, float* %22
%184 = load float, float* %9
%185 = load float, float* %16
%186 = fadd float %184, %185
store float %186, float* %23
%187 = load float, float* %8
%188 = load float, float* %17
%189 = fadd float %187, %188
store float %189, float* %8
%190 = load float, float* %9
%191 = load float, float* %16
%192 = fsub float %190, %191
store float %192, float* %9
%193 = load float, float* %6
%194 = load float, float* %14
%195 = load float, float* %3
%196 = fneg float %194
%197 = call float @llvm.fmuladd.f32(float %196, float %195, float %193)
%198 = load float, float* %15
%199 = load float, float* %3
%200 = fneg float %198
%201 = call float @llvm.fmuladd.f32(float %200, float %199, float %197)
store float %201, float* %12
%202 = load float, float* %7
%203 = load float, float* %14
%204 = load float, float* %3
%205 = call float @llvm.fmuladd.f32(float %203, float %204, float %202)
%206 = load float, float* %15
%207 = load float, float* %3
%208 = fneg float %206
%209 = call float @llvm.fmuladd.f32(float %208, float %207, float %205)
store float %209, float* %13
%210 = load float, float* %6
%211 = load float, float* %12
%212 = fneg float %211
%213 = call float @llvm.fmuladd.f32(float %210, float 2.000000e+00, float %212)
store float %213, float* %6
%214 = load float, float* %7
%215 = load float, float* %13
%216 = fneg float %215
%217 = call float @llvm.fmuladd.f32(float %214, float 2.000000e+00, float %216)
store float %217, float* %7
%218 = load float, float* %10
%219 = load float, float* %18
%220 = load float, float* %3
%221 = call float @llvm.fmuladd.f32(float %219, float %220, float %218)
%222 = load float, float* %19
%223 = load float, float* %3
%224 = fneg float %222
%225 = call float @llvm.fmuladd.f32(float %224, float %223, float %221)
store float %225, float* %16
%226 = load float, float* %11
%227 = load float, float* %18
%228 = load float, float* %3
%229 = call float @llvm.fmuladd.f32(float %227, float %228, float %226)
%230 = load float, float* %19
%231 = load float, float* %3
%232 = call float @llvm.fmuladd.f32(float %230, float %231, float %229)
store float %232, float* %17
%233 = load float, float* %10
%234 = load float, float* %16
%235 = fneg float %234
%236 = call float @llvm.fmuladd.f32(float %233, float 2.000000e+00, float %235)
store float %236, float* %10
%237 = load float, float* %11
%238 = load float, float* %17
%239 = fneg float %238
%240 = call float @llvm.fmuladd.f32(float %237, float 2.000000e+00, float %239)
store float %240, float* %11
%241 = load float, float* %4
%242 = load float*, float** %2
%243 = getelementptr inbounds float, float* %242, i64 0
store float %241, float* %243
%244 = load float, float* %5
%245 = load float*, float** %2
%246 = getelementptr inbounds float, float* %245, i64 1
store float %244, float* %246
%247 = load float, float* %6
%248 = load float*, float** %2
%249 = getelementptr inbounds float, float* %248, i64 2
store float %247, float* %249
%250 = load float, float* %7
%251 = load float*, float** %2
%252 = getelementptr inbounds float, float* %251, i64 3
store float %250, float* %252
%253 = load float, float* %8
%254 = load float*, float** %2
%255 = getelementptr inbounds float, float* %254, i64 4
store float %253, float* %255
%256 = load float, float* %9
%257 = load float*, float** %2
%258 = getelementptr inbounds float, float* %257, i64 5
store float %256, float* %258
%259 = load float, float* %10
%260 = load float*, float** %2
%261 = getelementptr inbounds float, float* %260, i64 6
store float %259, float* %261
%262 = load float, float* %11
%263 = load float*, float** %2
%264 = getelementptr inbounds float, float* %263, i64 7
store float %262, float* %264
%265 = load float, float* %20
%266 = load float*, float** %2
%267 = getelementptr inbounds float, float* %266, i64 8
store float %265, float* %267
%268 = load float, float* %21
%269 = load float*, float** %2
%270 = getelementptr inbounds float, float* %269, i64 9
store float %268, float* %270
%271 = load float, float* %12
%272 = load float*, float** %2
%273 = getelementptr inbounds float, float* %272, i64 10
store float %271, float* %273
%274 = load float, float* %13
%275 = load float*, float** %2
%276 = getelementptr inbounds float, float* %275, i64 11
store float %274, float* %276
%277 = load float, float* %22
%278 = load float*, float** %2
%279 = getelementptr inbounds float, float* %278, i64 12
store float %277, float* %279
%280 = load float, float* %23
%281 = load float*, float** %2
%282 = getelementptr inbounds float, float* %281, i64 13
store float %280, float* %282
%283 = load float, float* %16
%284 = load float*, float** %2
%285 = getelementptr inbounds float, float* %284, i64 14
store float %283, float* %285
%286 = load float, float* %17
%287 = load float*, float** %2
%288 = getelementptr inbounds float, float* %287, i64 15
store float %286, float* %288
ret void
}

LLVM IR (-O2):
define void @fft8pt(float* nocapture %0) {
%2 = load float, float* %0
%3 = getelementptr inbounds float, float* %0, i64 1
%4 = load float, float* %3
%5 = getelementptr inbounds float, float* %0, i64 8
%6 = load float, float* %5
%7 = getelementptr inbounds float, float* %0, i64 9
%8 = load float, float* %7
%9 = getelementptr inbounds float, float* %0, i64 4
%10 = load float, float* %9
%11 = getelementptr inbounds float, float* %0, i64 5
%12 = load float, float* %11
%13 = getelementptr inbounds float, float* %0, i64 12
%14 = load float, float* %13
%15 = getelementptr inbounds float, float* %0, i64 13
%16 = load float, float* %15
%17 = getelementptr inbounds float, float* %0, i64 2
%18 = load float, float* %17
%19 = getelementptr inbounds float, float* %0, i64 3
%20 = load float, float* %19
%21 = getelementptr inbounds float, float* %0, i64 10
%22 = load float, float* %21
%23 = getelementptr inbounds float, float* %0, i64 11
%24 = load float, float* %23
%25 = getelementptr inbounds float, float* %0, i64 6
%26 = load float, float* %25
%27 = getelementptr inbounds float, float* %0, i64 7
%28 = load float, float* %27
%29 = getelementptr inbounds float, float* %0, i64 14
%30 = load float, float* %29
%31 = getelementptr inbounds float, float* %0, i64 15
%32 = load float, float* %31
%33 = fadd float %2, %6
%34 = fadd float %4, %8
%35 = fsub float %2, %6
%36 = fsub float %4, %8
%37 = fsub float %10, %14
%38 = fsub float %12, %16
%39 = fadd float %10, %14
%40 = fadd float %12, %16
%41 = fadd float %33, %39
%42 = fadd float %34, %40
%43 = fsub float %33, %39
%44 = fsub float %34, %40
%45 = fsub float %35, %38
%46 = fadd float %36, %37
%47 = fadd float %35, %38
%48 = fsub float %36, %37
%49 = fadd float %18, %22
%50 = fadd float %20, %24
%51 = fsub float %18, %22
%52 = fsub float %20, %24
%53 = fsub float %26, %30
%54 = fsub float %28, %32
%55 = fadd float %26, %30
%56 = fadd float %28, %32
%57 = fadd float %49, %55
%58 = fadd float %50, %56
%59 = fsub float %49, %55
%60 = fsub float %50, %56
%61 = fsub float %51, %54
%62 = fadd float %52, %53
%63 = fadd float %51, %54
%64 = fsub float %52, %53
%65 = fsub float %41, %57
%66 = fsub float %42, %58
%67 = fadd float %41, %57
%68 = fadd float %42, %58
%69 = fsub float %43, %60
%70 = fadd float %44, %59
%71 = fadd float %43, %60
%72 = fsub float %44, %59
%73 = fneg float %63
%74 = tail call float @llvm.fmuladd.f32(float %73, float 0x3FE6A09E60000000, float %47)
%75 = fneg float %64
%76 = tail call float @llvm.fmuladd.f32(float %75, float 0x3FE6A09E60000000, float %74)
%77 = tail call float @llvm.fmuladd.f32(float %63, float 0x3FE6A09E60000000, float %48)
%78 = tail call float @llvm.fmuladd.f32(float %75, float 0x3FE6A09E60000000, float %77)
%79 = fneg float %76
%80 = tail call float @llvm.fmuladd.f32(float %47, float 2.000000e+00, float %79)
%81 = fneg float %78
%82 = tail call float @llvm.fmuladd.f32(float %48, float 2.000000e+00, float %81)
%83 = tail call float @llvm.fmuladd.f32(float %61, float 0x3FE6A09E60000000, float %45)
%84 = fneg float %62
%85 = tail call float @llvm.fmuladd.f32(float %84, float 0x3FE6A09E60000000, float %83)
%86 = tail call float @llvm.fmuladd.f32(float %61, float 0x3FE6A09E60000000, float %46)
%87 = tail call float @llvm.fmuladd.f32(float %62, float 0x3FE6A09E60000000, float %86)
%88 = fneg float %85
%89 = tail call float @llvm.fmuladd.f32(float %45, float 2.000000e+00, float %88)
%90 = fneg float %87
%91 = tail call float @llvm.fmuladd.f32(float %46, float 2.000000e+00, float %90)
store float %67, float* %0
store float %68, float* %3
store float %80, float* %17
store float %82, float* %19
store float %71, float* %9
store float %72, float* %11
store float %89, float* %25
store float %91, float* %27
store float %65, float* %5
store float %66, float* %7
store float %76, float* %21
store float %78, float* %23
store float %69, float* %13
store float %70, float* %15
store float %85, float* %29
store float %87, float* %31
ret void
}