1 files changed, 33 insertions, 0 deletions
diff --git a/src/third-party/base64/lib/arch/ssse3/dec_reshuffle.c b/src/third-party/base64/lib/arch/ssse3/dec_reshuffle.c
new file mode 100644
index 0000000..fdf587f
--- /dev/null
+++ b/src/third-party/base64/lib/arch/ssse3/dec_reshuffle.c
@@ -0,0 +1,33 @@
+static inline __m128i
+dec_reshuffle (const __m128i in)
+{
+	// in, bits, upper case are most significant bits, lower case are least significant bits
+	// 00llllll 00kkkkLL 00jjKKKK 00JJJJJJ
+	// 00iiiiii 00hhhhII 00ggHHHH 00GGGGGG
+	// 00ffffff 00eeeeFF 00ddEEEE 00DDDDDD
+	// 00cccccc 00bbbbCC 00aaBBBB 00AAAAAA
+
+	const __m128i merge_ab_and_bc = _mm_maddubs_epi16(in, _mm_set1_epi32(0x01400140));
+	// 0000kkkk LLllllll 0000JJJJ JJjjKKKK
+	// 0000hhhh IIiiiiii 0000GGGG GGggHHHH
+	// 0000eeee FFffffff 0000DDDD DDddEEEE
+	// 0000bbbb CCcccccc 0000AAAA AAaaBBBB
+
+	const __m128i out = _mm_madd_epi16(merge_ab_and_bc, _mm_set1_epi32(0x00011000));
+	// 00000000 JJJJJJjj KKKKkkkk LLllllll
+	// 00000000 GGGGGGgg HHHHhhhh IIiiiiii
+	// 00000000 DDDDDDdd EEEEeeee FFffffff
+	// 00000000 AAAAAAaa BBBBbbbb CCcccccc
+
+	// Pack bytes together:
+	return  _mm_shuffle_epi8(out, _mm_setr_epi8(
+		 2,  1,  0,
+		 6,  5,  4,
+		10,  9,  8,
+		14, 13, 12,
+		-1, -1, -1, -1));
+	// 00000000 00000000 00000000 00000000
+	// LLllllll KKKKkkkk JJJJJJjj IIiiiiii
+	// HHHHhhhh GGGGGGgg FFffffff EEEEeeee
+	// DDDDDDdd CCcccccc BBBBbbbb AAAAAAaa
+}