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fix: compile sqlite-vec NEON on ARM #17

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Merged
gabewillen merged 1 commit into from
Aug 7, 2026
Merged

fix: compile sqlite-vec NEON on ARM #17

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13 changes: 8 additions & 5 deletions third_party/sqlite-vec/sqlite-vec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -280,22 +280,25 @@ static i32 l1_int8_neon(const void *pVect1v, const void *pVect2v,
int8x16_t v1 = vld1q_s8(pVect1);
int8x16_t v2 = vld1q_s8(pVect2);
int8x16_t diff1 = vabdq_s8(v1, v2);
acc1 = vaddq_s32(acc1, vpaddlq_u16(vpaddlq_u8(diff1)));
// vabdq_s8 returns signed vector bits; reinterpret them as unsigned
// before widening so absolute differences in the 128..255 range are
// accumulated without sign extension.
acc1 = vaddq_s32(acc1, vpaddlq_u16(vpaddlq_u8(vreinterpretq_u8_s8(diff1))));

v1 = vld1q_s8(pVect1 + 16);
v2 = vld1q_s8(pVect2 + 16);
int8x16_t diff2 = vabdq_s8(v1, v2);
acc2 = vaddq_s32(acc2, vpaddlq_u16(vpaddlq_u8(diff2)));
acc2 = vaddq_s32(acc2, vpaddlq_u16(vpaddlq_u8(vreinterpretq_u8_s8(diff2))));

v1 = vld1q_s8(pVect1 + 32);
v2 = vld1q_s8(pVect2 + 32);
int8x16_t diff3 = vabdq_s8(v1, v2);
acc3 = vaddq_s32(acc3, vpaddlq_u16(vpaddlq_u8(diff3)));
acc3 = vaddq_s32(acc3, vpaddlq_u16(vpaddlq_u8(vreinterpretq_u8_s8(diff3))));

v1 = vld1q_s8(pVect1 + 48);
v2 = vld1q_s8(pVect2 + 48);
int8x16_t diff4 = vabdq_s8(v1, v2);
acc4 = vaddq_s32(acc4, vpaddlq_u16(vpaddlq_u8(diff4)));
acc4 = vaddq_s32(acc4, vpaddlq_u16(vpaddlq_u8(vreinterpretq_u8_s8(diff4))));

pVect1 += 64;
pVect2 += 64;
Expand All @@ -305,7 +308,7 @@ static i32 l1_int8_neon(const void *pVect1v, const void *pVect2v,
int8x16_t v1 = vld1q_s8(pVect1);
int8x16_t v2 = vld1q_s8(pVect2);
int8x16_t diff = vabdq_s8(v1, v2);
acc1 = vaddq_s32(acc1, vpaddlq_u16(vpaddlq_u8(diff)));
acc1 = vaddq_s32(acc1, vpaddlq_u16(vpaddlq_u8(vreinterpretq_u8_s8(diff))));
pVect1 += 16;
pVect2 += 16;
}
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