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diff --git a/app/operations/layer-modes/gimpoperationnormal-sse2.c b/app/operations/layer-modes/gimpoperationnormal-sse2.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationnormal-sse2.c
+ * Copyright (C) 2013 Daniel Sabo
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "operations/operations-types.h"
+
+#include "gimpoperationnormal.h"
+
+
+#if COMPILE_SSE2_INTRINISICS
+
+/* SSE2 */
+#include <emmintrin.h>
+
+
+gboolean
+gimp_operation_normal_process_sse2 (GeglOperation *op,
+ void *in_p,
+ void *layer_p,
+ void *mask_p,
+ void *out_p,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ /* check alignment */
+ if ((((uintptr_t)in_p) | ((uintptr_t)layer_p) | ((uintptr_t)out_p)) & 0x0F)
+ {
+ return gimp_operation_normal_process (op,
+ in_p, layer_p, mask_p, out_p,
+ samples, roi, level);
+ }
+ else
+ {
+ GimpOperationLayerMode *layer_mode = (gpointer) op;
+ gfloat opacity = layer_mode->opacity;
+ gfloat *mask = mask_p;
+ const __v4sf *v_in = (const __v4sf*) in_p;
+ const __v4sf *v_layer = (const __v4sf*) layer_p;
+ __v4sf *v_out = ( __v4sf*) out_p;
+
+ const __v4sf one = _mm_set1_ps (1.0f);
+ const __v4sf v_opacity = _mm_set1_ps (opacity);
+
+ switch (layer_mode->composite_mode)
+ {
+ case GIMP_LAYER_COMPOSITE_UNION:
+ case GIMP_LAYER_COMPOSITE_AUTO:
+ while (samples--)
+ {
+ __v4sf rgba_in, rgba_layer, alpha;
+
+ rgba_in = *v_in++;
+ rgba_layer = *v_layer++;
+
+ /* expand alpha */
+ alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ if (mask)
+ {
+ __v4sf mask_alpha;
+
+ /* multiply layer's alpha by the mask */
+ mask_alpha = _mm_set1_ps (*mask++);
+ alpha = alpha * mask_alpha;
+ }
+
+ alpha = alpha * v_opacity;
+
+ if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+ {
+ __v4sf dst_alpha, a_term, out_pixel, out_alpha, out_pixel_rbaa;
+
+ /* expand alpha */
+ dst_alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ /* a_term = dst_a * (1.0 - src_a) */
+ a_term = dst_alpha * (one - alpha);
+
+ /* out(color) = src * src_a + dst * a_term */
+ out_pixel = rgba_layer * alpha + rgba_in * a_term;
+
+ /* out(alpha) = 1.0 * src_a + 1.0 * a_term */
+ out_alpha = alpha + a_term;
+
+ /* un-premultiply */
+ out_pixel = out_pixel / out_alpha;
+
+ /* swap in the real alpha */
+ out_pixel_rbaa = _mm_shuffle_ps (out_pixel, out_alpha, _MM_SHUFFLE (3, 3, 2, 0));
+ out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+ *v_out++ = out_pixel;
+ }
+ else
+ {
+ *v_out++ = rgba_in;
+ }
+ }
+ break;
+
+ case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+ while (samples--)
+ {
+ __v4sf rgba_in, rgba_layer, alpha;
+
+ rgba_in = *v_in++;
+ rgba_layer = *v_layer++;
+
+ /* expand alpha */
+ alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ if (mask)
+ {
+ __v4sf mask_alpha;
+
+ /* multiply layer's alpha by the mask */
+ mask_alpha = _mm_set1_ps (*mask++);
+ alpha = alpha * mask_alpha;
+ }
+
+ alpha = alpha * v_opacity;
+
+ if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+ {
+ __v4sf dst_alpha, out_pixel, out_pixel_rbaa;
+
+ /* expand alpha */
+ dst_alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ /* out(color) = dst * (1 - src_a) + src * src_a */
+ out_pixel = rgba_in + (rgba_layer - rgba_in) * alpha;
+
+ /* swap in the real alpha */
+ out_pixel_rbaa = _mm_shuffle_ps (out_pixel, dst_alpha, _MM_SHUFFLE (3, 3, 2, 0));
+ out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+ *v_out++ = out_pixel;
+ }
+ else
+ {
+ *v_out++ = rgba_in;
+ }
+ }
+ break;
+
+ case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+ while (samples--)
+ {
+ __v4sf rgba_in, rgba_layer, alpha;
+ __v4sf out_pixel, out_pixel_rbaa;
+
+ rgba_in = *v_in++;
+ rgba_layer = *v_layer++;
+
+ /* expand alpha */
+ alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ if (mask)
+ {
+ __v4sf mask_alpha;
+
+ /* multiply layer's alpha by the mask */
+ mask_alpha = _mm_set1_ps (*mask++);
+ alpha = alpha * mask_alpha;
+ }
+
+ alpha = alpha * v_opacity;
+
+ if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+ {
+ /* out(color) = src */
+ out_pixel = rgba_layer;
+ }
+ else
+ {
+ out_pixel = rgba_in;
+ }
+
+ /* swap in the real alpha */
+ out_pixel_rbaa = _mm_shuffle_ps (out_pixel, alpha, _MM_SHUFFLE (3, 3, 2, 0));
+ out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+ *v_out++ = out_pixel;
+ }
+ break;
+
+ case GIMP_LAYER_COMPOSITE_INTERSECTION:
+ while (samples--)
+ {
+ __v4sf rgba_in, rgba_layer, alpha;
+ __v4sf out_pixel, out_pixel_rbaa;
+
+ rgba_in = *v_in++;
+ rgba_layer = *v_layer++;
+
+ /* expand alpha */
+ alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ if (mask)
+ {
+ __v4sf mask_alpha;
+
+ /* multiply layer's alpha by the mask */
+ mask_alpha = _mm_set1_ps (*mask++);
+ alpha = alpha * mask_alpha;
+ }
+
+ alpha = alpha * v_opacity;
+
+ /* multiply the alpha by in's alpha */
+ alpha *= (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+ _MM_SHUFFLE (3, 3, 3, 3));
+
+ if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+ {
+ /* out(color) = src */
+ out_pixel = rgba_layer;
+ }
+ else
+ {
+ out_pixel = rgba_in;
+ }
+
+ /* swap in the real alpha */
+ out_pixel_rbaa = _mm_shuffle_ps (out_pixel, alpha, _MM_SHUFFLE (3, 3, 2, 0));
+ out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+ *v_out++ = out_pixel;
+ }
+ break;
+ }
+ }
+
+ return TRUE;
+}
+
+#endif /* COMPILE_SSE2_INTRINISICS */
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