DC8_NEON,aarch64: use vaddv
results in one fewer instruction for both DC8uv_NEON and
DC8uvNoLeft_NEON
@@ -1428,10 +1428,16 @@ static WEBP_INLINE void DC8_NEON(uint8_t* dst, int do_top, int do_left) {
if (do_top) {
const uint8x8_t A = vld1_u8(dst - BPS); // top row
+#if defined(__aarch64__)
+ const uint16x8_t B = vmovl_u8(A);
+ const uint16_t p2 = vaddvq_u16(B);
+ sum_top = vdupq_n_u16(p2);
+#else
const uint16x4_t p0 = vpaddl_u8(A); // cascading summation of the top
const uint16x4_t p1 = vpadd_u16(p0, p0);
const uint16x4_t p2 = vpadd_u16(p1, p1);
sum_top = vcombine_u16(p2, p2);
+#endif
}
if (do_left) {
