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NEON: fix incorrect accumulation in v_dotprod_expand_fast

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pratham-mcw
2025-12-15 20:51:46 +05:30
parent 579dfb6e02
commit ddf2863aaa
1 changed files with 4 additions and 3 deletions
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modules/core/include/opencv2/core/hal/intrin_neon.hpp
+4 -3
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@@ -888,9 +888,10 @@ inline v_uint32x4 v_dotprod_expand_fast(const v_uint8x16& a, const v_uint8x16& b
inline v_int32x4 v_dotprod_expand_fast(const v_int8x16& a, const v_int8x16& b)
{
int16x8_t prod = vmull_s8(vget_low_s8(a.val), vget_low_s8(b.val));
prod = vmlal_s8(prod, vget_high_s8(a.val), vget_high_s8(b.val));
return v_int32x4(vaddl_s16(vget_low_s16(prod), vget_high_s16(prod)));
int16x8_t p0 = vmull_s8(vget_low_s8(a.val), vget_low_s8(b.val));
int16x8_t p1 = vmull_s8(vget_high_s8(a.val), vget_high_s8(b.val));
int32x4_t s0 = vaddl_s16(vget_low_s16(p0), vget_low_s16(p1));
return v_int32x4(vaddq_s32(s0, vaddl_s16(vget_high_s16(p0), vget_high_s16(p1))));
}
inline v_int32x4 v_dotprod_expand_fast(const v_int8x16& a, const v_int8x16& b, const v_int32x4& c)
{