vppinfra: add 128-bit and 512-bit a ^ b ^ c shortcut

This allows us to combine 2 XOR operations into signle instruction
which makes difference in crypto op:

- in x86, by using ternary logic instruction
- on ARM, by using EOR3 instruction (available with sha3 feature)

Type: refactor
Change-Id: Ibdf9001840399d2f838d491ca81b57cbd8430433
Signed-off-by: Damjan Marion <damjan.marion@gmail.com>

3 files changed, 27 insertions, 0 deletions

diff --git a/src/vppinfra/vector_avx512.h b/src/vppinfra/vector_avx512.h
index c54d8cd2499..29d96f85ce9 100644
--- a/src/vppinfra/vector_avx512.h
+++ b/src/vppinfra/vector_avx512.h
@@ -143,6 +143,13 @@ u64x8_permute (u64x8 a, u64x8 b, u64x8 mask)
 #define u32x16_ternary_logic(a, b, c, d) \
   (u32x16) _mm512_ternarylogic_epi32 ((__m512i) a, (__m512i) b, (__m512i) c, d)
 
+static_always_inline u8x64
+u8x64_xor3 (u8x64 a, u8x64 b, u8x64 c)
+{
+  return (u8x64) _mm512_ternarylogic_epi32 ((__m512i) a, (__m512i) b,
+					    (__m512i) c, 0x96);
+}
+
 static_always_inline void
 u32x16_transpose (u32x16 m[16])
 {
diff --git a/src/vppinfra/vector_neon.h b/src/vppinfra/vector_neon.h
index 81d99a64f05..3855f55ad41 100644
--- a/src/vppinfra/vector_neon.h
+++ b/src/vppinfra/vector_neon.h
@@ -203,6 +203,17 @@ u8x16_reflect (u8x16 v)
   return (u8x16) vqtbl1q_u8 (v, mask);
 }
 
+static_always_inline u8x16
+u8x16_xor3 (u8x16 a, u8x16 b, u8x16 c)
+{
+#if __GNUC__ == 8 && __ARM_FEATURE_SHA3 == 1
+  u8x16 r;
+__asm__ ("eor3 %0.16b,%1.16b,%2.16b,%3.16b": "=w" (r): "0" (a), "w" (b), "w" (c):);
+  return r;
+#endif
+  return a ^ b ^ c;
+}
+
 #define CLIB_HAVE_VEC128_MSB_MASK
 
 #define CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE
diff --git a/src/vppinfra/vector_sse42.h b/src/vppinfra/vector_sse42.h
index c22e86e7437..e75580e6026 100644
--- a/src/vppinfra/vector_sse42.h
+++ b/src/vppinfra/vector_sse42.h
@@ -746,6 +746,15 @@ u8x16_blend (u8x16 v1, u8x16 v2, u8x16 mask)
   return (u8x16) _mm_blendv_epi8 ((__m128i) v1, (__m128i) v2, (__m128i) mask);
 }
 
+static_always_inline u8x16
+u8x16_xor3 (u8x16 a, u8x16 b, u8x16 c)
+{
+#if __AVX512F__
+  return (u8x16) _mm_ternarylogic_epi32 ((__m128i) a, (__m128i) b,
+					 (__m128i) c, 0x96);
+#endif
+  return a ^ b ^ c;
+}
 
 #endif /* included_vector_sse2_h */