diff --git a/gm/xferu64.cpp b/gm/xferu64.cpp
deleted file mode 100644
index fef1a44b93..0000000000
--- a/gm/xferu64.cpp
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "gm.h"
-#include "SkCanvas.h"
-#include "SkImageInfo.h"
-#include "SkXfermode.h"
-#include "SkHalf.h"
-#include "SkImage.h"
-#include "SkPM4f.h"
-
-static SkPMColor f16_to_pmcolor(uint64_t src) {
-    SkPMColor dst;
-    const SkHalf* sptr = reinterpret_cast<const SkHalf*>(&src);
-    uint8_t* dptr = reinterpret_cast<uint8_t*>(&dst);
-    for (int i = 0; i < 4; ++i) {
-        float f = SkHalfToFloat(sptr[i]);
-        dptr[i] = SkToU8((int)(f * 255 + 0.5f));
-    }
-    return dst;
-}
-
-static SkPMColor u16_to_pmcolor(uint64_t src) {
-    SkPMColor dst;
-    const uint16_t* sptr = reinterpret_cast<const uint16_t*>(&src);
-    uint8_t* dptr = reinterpret_cast<uint8_t*>(&dst);
-    for (int i = 0; i < 4; ++i) {
-        dptr[i] = sptr[i] >> 8;
-    }
-    return dst;
-}
-
-static SkImage* new_u64_image(const SkBitmap& src, uint32_t flags) {
-    SkBitmap dst;
-    dst.allocN32Pixels(src.width(), src.height());
-    SkPixmap srcPM, dstPM;
-    src.peekPixels(&srcPM);
-    dst.peekPixels(&dstPM);
-
-    for (int y = 0; y < srcPM.height(); ++y) {
-        for (int x = 0; x < srcPM.width(); ++x) {
-            uint64_t srcP = *srcPM.addr64(x, y);
-            uint32_t* dstP = dstPM.writable_addr32(x, y);
-
-            if (flags & SkXfermode::kDstIsFloat16_U64Flag) {
-                *dstP = f16_to_pmcolor(srcP);
-            } else {
-                *dstP = u16_to_pmcolor(srcP);
-            }
-        }
-    }
-    return SkImage::NewRasterCopy(dstPM.info(), dstPM.addr(), dstPM.rowBytes());
-}
-
-static void draw_rect(SkCanvas* canvas, const SkRect& r, SkColor c, uint32_t u64_flags,
-                      const SkAlpha aa[]) {
-    const SkIRect ir = r.round();
-    const SkImageInfo info = SkImageInfo::Make(ir.width(), ir.height(),
-                                               kRGBA_F16_SkColorType, kPremul_SkAlphaType);
-
-    SkBitmap bm;
-    bm.allocPixels(info);
-    SkPixmap pm;
-    bm.peekPixels(&pm);
-    memset(pm.writable_addr(), 0, pm.getSafeSize());
-
-    if (SkColorGetA(c) == 0xFF) {
-        u64_flags |= SkXfermode::kSrcIsOpaque_PM4fFlag;
-    }
-
-    const SkXfermode::U64State state { nullptr, u64_flags };
-
-    const SkPM4f src = SkColor4f::FromColor(c).premul();
-    auto proc1 = SkXfermode::GetU64Proc1(SkXfermode::kSrcOver_Mode, u64_flags);
-    for (int y = 0; y < ir.height()/2; ++y) {
-        proc1(state, pm.writable_addr64(0, y), src, ir.width(), aa);
-    }
-    
-    SkPM4f buffer[1000];
-    for (int i = 0; i < ir.width(); ++i) {
-        buffer[i] = src;
-    }
-    auto procN = SkXfermode::GetU64ProcN(SkXfermode::kSrcOver_Mode, u64_flags);
-    for (int y = ir.height()/2 + 1; y < ir.height(); ++y) {
-        procN(state, pm.writable_addr64(0, y), buffer, ir.width(), aa);
-    }
-
-    SkAutoTUnref<SkImage> image(new_u64_image(bm, u64_flags));
-    canvas->drawImage(image, r.left(), r.top(), nullptr);
-}
-
-/*
- *  Test SkXfer4fProcs directly for src-over, comparing them to current SkColor blits.
- */
-DEF_SIMPLE_GM(xfer_u64_srcover, canvas, 580, 760) {
-    const int IW = 50;
-    const SkScalar W = IW;
-    const SkScalar H = 100;
-
-    const int32_t flags[] = {
-        -1,                                 // normal
-        0,                                  // U16 components
-        SkXfermode::kDstIsFloat16_U64Flag,  // F16 components
-    };
-    const SkColor colors[] = {
-        SK_ColorBLACK, SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE,
-        0x88000000, 0x88FF0000, 0x8800FF00, 0x880000FF
-    };
-    
-    uint8_t aa_scanline[IW];
-    for (int i = 0; i < IW; ++i) {
-        aa_scanline[i] = i * 255 / (IW - 1);
-    }
-    uint8_t const* aa_table[] = { nullptr, aa_scanline };
-
-    SkBitmap mask;
-    mask.installPixels(SkImageInfo::MakeA8(IW, 1), aa_scanline, IW);
-
-    canvas->translate(20, 20);
-
-    const SkRect r = SkRect::MakeWH(W, H);
-    for (const uint8_t* aa : aa_table) {
-        canvas->save();
-        for (auto flag : flags) {
-            canvas->save();
-            for (SkColor c : colors) {
-                if (flag < 0) {
-                    SkPaint p;
-                    p.setColor(c);
-                    if (aa) {
-                        canvas->drawBitmapRect(mask, r, &p);
-                    } else {
-                        canvas->drawRect(r, p);
-                    }
-                } else {
-                    draw_rect(canvas, r, c, flag, aa);
-                }
-                canvas->translate(W + 20, 0);
-            }
-            canvas->restore();
-            canvas->translate(0, H + 20);
-        }
-        canvas->restore();
-        canvas->translate(0, (H + 20) * SK_ARRAY_COUNT(flags) + 20);
-    }
-}