1 files changed, 71 insertions, 0 deletions
diff --git a/libgsmhr/mmx.c b/libgsmhr/mmx.c
new file mode 100644
index 0000000..8e4fad2
--- /dev/null
+++ b/libgsmhr/mmx.c
@@ -0,0 +1,71 @@
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+typedef int16_t v4hi __attribute__ ((vector_size (8)));
+typedef int32_t v2si __attribute__ ((vector_size (8)));
+
+union v4_s16 {
+	v4hi	v;
+	int16_t	s16[4];
+};
+
+union v2_s32 {
+	v2si	v;
+	int32_t s32[2];
+};
+
+extern int32_t sat_adds32b(int32_t a, int32_t b);
+
+/* multiply-accumulate of 8 16-bit values */
+int32_t mmx_mac_unsat(int16_t *_x, int16_t *_y)
+{
+	register union v4_s16 *x = (union v4_s16 *)_x;
+	union v4_s16 *y = (union v4_s16 *)_y;
+	union v2_s32 im1, im2, r;
+
+	/* im1.s32[0] = x->s16[0] * y->s16[0] + x->s16[1] * y->s16[1]
+	 * im1.s32[1] = x->s16[2] * y->s16[2] + x->s16[3] * y->s16[3] */
+	im1.v = __builtin_ia32_pmaddwd(x->v, y->v);
+	/* results are saturated */
+
+	/* im2.s32[0] = x->s16[4] * y->s16[4] + x->s16[5] * y->s16[5]
+	 * im2.s32[1] = x->s16[6] * y->s16[6]+ x->s16[7] * y->s16[7] */
+	im2.v = __builtin_ia32_pmaddwd((x+1)->v, (y+1)->v);
+	/* results are saturated */
+
+	/* im1.s32[0] = im1.s32[0] + im2.s32[0]
+	 * im1.s32[1] = im1.s32[1] + im2.s32[1] */
+	/* FIXME: overflow in addition could happen */
+	im1.v = __builtin_ia32_paddd(im1.v, im2.v);
+
+	/* FIXME: overflow in addition could happen */
+	return (im1.s32[0] + im1.s32[1]) << 1;
+}
+
+/* multiply-accumulate of 8 16-bit values */
+int32_t mmx_mac_sat(int16_t *_x, int16_t *_y)
+{
+	register union v4_s16 *x = (union v4_s16 *)_x;
+	union v4_s16 *y = (union v4_s16 *)_y;
+	union v2_s32 im1, im2, r;
+
+	/* im1.s32[0] = x->s16[0] * y->s16[0] + x->s16[1] * y->s16[1]
+	 * im1.s32[1] = x->s16[2] * y->s16[2] + x->s16[3] * y->s16[3] */
+	im1.v = __builtin_ia32_pmaddwd(x->v, y->v);
+	/* results are saturated */
+
+	/* im2.s32[0] = x->s16[4] * y->s16[4] + x->s16[5] * y->s16[5]
+	 * im2.s32[1] = x->s16[6] * y->s16[6]+ x->s16[7] * y->s16[7] */
+	im2.v = __builtin_ia32_pmaddwd((x+1)->v, (y+1)->v);
+	/* results are saturated */
+
+	/* im1.s32[0] = im1.s32[0] + im2.s32[0]
+	 * im1.s32[1] = im1.s32[1] + im2.s32[1] */
+	im1.s32[0] = sat_adds32b(im1.s32[0], im2.s32[0]);
+	im1.s32[1] = sat_adds32b(im1.s32[1], im2.s32[1]);
+
+	/* FIXME: overflow in addition could happen */
+	return sat_adds32b(im1.s32[0], im1.s32[1]) << 1;
+}