opt bytes_from_nibbles_32 and sum_i16_pairs_float

Author: MQ-mengqing

ggml-quants.c

@@ -943,21 +943,15 @@ static inline __m256i bytes_from_bits_32(const uint8_t * x) {
 // The output vector contains 32 bytes, each one in [ 0 .. 15 ] interval
 static inline __m256i bytes_from_nibbles_32(const uint8_t * rsi)
 {
-    const __m128i tmp = __lsx_vld((const __m128i *)rsi, 0);
-    __m128i tmp2 = __lsx_vsrli_h(tmp, 4);
-    __m128i lowMask = __lsx_vreplgr2vr_b(0xf);
-    __m128i tmpl = __lsx_vand_v(tmp, lowMask);
-    __m128i tmph = __lsx_vand_v(tmp2, lowMask);
-    return MM256_SET_M128I(tmph, tmpl);
+    const __m128i lo = __lsx_vld((const __m128i *)rsi, 0);
+    __m128i hi = __lsx_vsrli_h(lo, 4);
+    return __lasx_xvandi_b(MM256_SET_M128I(hi, lo), 0xf);
 }
 
 // add int16_t pairwise and return as float vector
 static inline __m256 sum_i16_pairs_float(const __m256i x) {
-    const __m256i ones = __lasx_xvreplgr2vr_h(1);
-
-    __m256i zero256 = __lasx_xvldi(0);
-    const __m256i tmp1 = __lasx_xvmaddwev_w_h(zero256, ones, x);
-    const __m256i summed_pairs = __lasx_xvmaddwod_w_h(tmp1, ones, x);
+    __m256i v = __lasx_xvpackod_h(x, x);
+    __m256i summed_pairs = __lasx_xvaddwev_w_h(x, v);
     return __lasx_xvffint_s_w(summed_pairs);
 }