vbatts/llama.cpp
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metal : revert unnecessary change

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Jhen 2023-10-17 12:11:26 +08:00
parent 7ebd4acb0a
commit a7a4887be9
1 changed files with 10 additions and 8 deletions
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18
ggml-metal.metal
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@ -2199,13 +2199,15 @@ void dequantize_f16(device const half4x4 * src, short il, thread type4x4 & reg)
template <typename type4x4>
void dequantize_q4_0(device const block_q4_0 *xb, short il, thread type4x4 & reg) {
device const uint16_t * qs = ((device const uint16_t *)xb + 1);
const float d = xb->d;
const float d1 = il ? (xb->d / 16.h) : xb->d;
const float d2 = d1 / 256.f;
const float md = -8.h * xb->d;
const ushort mask = il ? 0x00F0 : 0x000F;
const ushort mask0 = il ? 0x00F0 : 0x000F;
const ushort mask1 = mask0 << 8;
for (int i=0;i<8;i++) {
reg[i/2][2*(i%2)+0] = d * ((qs[i] & mask) >> (il ? 4 : 0)) + md;
reg[i/2][2*(i%2)+1] = d * (((qs[i] >> 8) & mask) >> (il ? 4 : 0)) + md;
reg[i/2][2*(i%2)+0] = d1 * (qs[i] & mask0) + md;
reg[i/2][2*(i%2)+1] = d2 * (qs[i] & mask1) + md;
}
}
@ -2235,13 +2237,13 @@ void dequantize_q5_0(device const block_q5_0 *xb, short il, thread type4x4 & reg
const int x_mv = (il ? 4 : 0);
const int qh_mv = (il ? 12 : 0);
const int qh_bk = (il ? 0 : 4);
const int gh_mv = (il ? 12 : 0);
const int gh_bk = (il ? 0 : 4);
for (int i = 0; i < 8; i++) {
// extract the 5-th bits for x0 and x1
const uint8_t xh_0 = ((qh >> (qh_mv + 2*i )) << qh_bk) & 0x10;
const uint8_t xh_1 = ((qh >> (qh_mv + 2*i+1)) << qh_bk) & 0x10;
const uint8_t xh_0 = ((qh >> (gh_mv + 2*i )) << gh_bk) & 0x10;
const uint8_t xh_1 = ((qh >> (gh_mv + 2*i+1)) << gh_bk) & 0x10;
// combine the 4-bits from qs with the 5th bit
const int32_t x0 = (((qs[i] & mask) >> x_mv) | xh_0);