FMA intrinsics with Nim

m128d.nim

{.passC: "-march=native".}

type m128d {.importc: "__m128d", nodecl.} = object

proc fma(x,y,z: float32): float32 {.importc: "fma", header: "<math.h>".}
proc fma(x,y,z: float64): float64 {.importc: "fmaf", header: "<math.h>".}
proc fmadd(x,y,z: m128d): m128d {.importc: "_mm_fmadd_sd", header: "<intrin.h>".}
proc loadpd(x: pointer): m128d {.importc: "_mm_load_pd", header: "<intrin.h>".}

converter tom128d(f: float): m128d = 
  {.emit: "result = _mm_load_pd(&`f`);".}

proc makem128d(s: float): m128d =
  {.emit: "result = _mm_load_pd(&`s`);".}

converter toFloat(m: m128d): float =
  {.emit: "result = _mm_cvtsd_f64(`m`);".}

proc `$`(m: m128d): string =
  result = $toFloat(m)

var 
  o: m128d = 1.0
  t: m128d = 2.0
  t2: m128d = 3.0

for i in 0..<1000:
  echo (fmadd(i.toFloat,2.0,3.0))

this is not a good way to do this