wtf clang

.LCPI0_0:
  .long 1127219200 # 0x43300000
  .long 1160773632 # 0x45300000
  .long 0 # 0x0
  .long 0 # 0x0
.LCPI0_1:
  .quad 0x4330000000000000 # double 4503599627370496
  .quad 0x4530000000000000 # double 1.9342813113834067E+25
.LCPI0_2:
  .quad 0x3ff0000000000000 # double 1
sum_reciprocals(unsigned long, unsigned long): # @sum_reciprocals(unsigned long, unsigned long)
  xorpd xmm0, xmm0
  cmp rsi, rdi
  jbe .LBB0_7
  mov ecx, esi
  sub ecx, edi
  mov rax, rdi
  not rax
  test cl, 1
  jne .LBB0_3
  xorpd xmm0, xmm0
  add rax, rsi
  jne .LBB0_5
  jmp .LBB0_7
.LBB0_3:
  movq xmm0, rdi
  punpckldq xmm0, xmmword ptr [rip + .LCPI0_0] # xmm0 = xmm0[0],mem[0],xmm0[1],mem[1]
  subpd xmm0, xmmword ptr [rip + .LCPI0_1]
  movapd xmm1, xmm0
  unpckhpd xmm1, xmm0 # xmm1 = xmm1[1],xmm0[1]
  addsd xmm1, xmm0
  movsd xmm2, qword ptr [rip + .LCPI0_2] # xmm2 = mem[0],zero
  divsd xmm2, xmm1
  xorpd xmm0, xmm0
  addsd xmm0, xmm2
  add rdi, 1
  add rax, rsi
  je .LBB0_7
.LBB0_5:
  movdqa xmm1, xmmword ptr [rip + .LCPI0_0] # xmm1 = [1127219200,1160773632,0,0]
  movapd xmm2, xmmword ptr [rip + .LCPI0_1] # xmm2 = [4.503599627370496E+15,1.9342813113834067E+25]
  movsd xmm3, qword ptr [rip + .LCPI0_2] # xmm3 = mem[0],zero
.LBB0_6: # =>This Inner Loop Header: Depth=1
  movq xmm4, rdi
  punpckldq xmm4, xmm1 # xmm4 = xmm4[0],xmm1[0],xmm4[1],xmm1[1]
  subpd xmm4, xmm2
  movapd xmm5, xmm4
  unpckhpd xmm5, xmm4 # xmm5 = xmm5[1],xmm4[1]
  addsd xmm5, xmm4
  movapd xmm4, xmm3
  divsd xmm4, xmm5
  addsd xmm4, xmm0
  lea rax, [rdi + 1]
  movq xmm0, rax
  punpckldq xmm0, xmm1 # xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
  subpd xmm0, xmm2
  movapd xmm5, xmm0
  unpckhpd xmm5, xmm0 # xmm5 = xmm5[1],xmm0[1]
  addsd xmm5, xmm0
  movapd xmm0, xmm3
  divsd xmm0, xmm5
  addsd xmm0, xmm4
  add rdi, 2
  cmp rdi, rsi
  jne .LBB0_6
.LBB0_7:
  ret