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metal : minor fixup in FA kernel (#10143)

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* metal : minor fixup in FA kernel

ggml-ci

* metal : use the unrolled loop variable

* metal : remove unused var
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Georgi Gerganov 2024-11-03 15:18:40 +02:00 committed by GitHub
parent 1839f69130
commit 08828a6d7d
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GPG Key ID: B5690EEEBB952194
1 changed files with 8 additions and 9 deletions
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ggml/src/ggml-metal.metal
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@ -2776,11 +2776,11 @@ kernel void kernel_flash_attn_ext_vec_f16(
const short iv3 = iq3 / rv3;
// load the queries from shared memory into local memory
float4 mq[D4];
float4 mq[D4/NW];
for (short ii = 0; ii < D4; ii += NW) {
short i = ii + tiisg;
mq[i] = (float4) sq4[i];
mq[ii/NW] = (float4) sq4[i];
}
// pointer to the mask
@ -2812,7 +2812,7 @@ kernel void kernel_flash_attn_ext_vec_f16(
mk[2] = (float4) pk4[i + 2*(nb11/8)];
mk[3] = (float4) pk4[i + 3*(nb11/8)];
mqk += (float4) (mq[i] * mk);
mqk += (float4) (mq[ii/NW] * mk);
}
// reduce the results from the threads in the simdgroup
@ -2857,8 +2857,7 @@ kernel void kernel_flash_attn_ext_vec_f16(
// O = diag(ms)*O
#pragma unroll
for (short ii = 0; ii < D4; ii += NW) {
const short i = ii + tiisg;
lo[i/NW] *= ms;
lo[ii/NW] *= ms;
}
}
@ -2872,10 +2871,10 @@ kernel void kernel_flash_attn_ext_vec_f16(
for (short ii = 0; ii < D4; ii += NW) {
const short i = ii + tiisg;
lo[i/NW] += pv4[i + 0*(nb21/8)] * ss[4*cc + 0];
lo[i/NW] += pv4[i + 1*(nb21/8)] * ss[4*cc + 1];
lo[i/NW] += pv4[i + 2*(nb21/8)] * ss[4*cc + 2];
lo[i/NW] += pv4[i + 3*(nb21/8)] * ss[4*cc + 3];
lo[ii/NW] += pv4[i + 0*(nb21/8)] * ss[4*cc + 0];
lo[ii/NW] += pv4[i + 1*(nb21/8)] * ss[4*cc + 1];
lo[ii/NW] += pv4[i + 2*(nb21/8)] * ss[4*cc + 2];
lo[ii/NW] += pv4[i + 3*(nb21/8)] * ss[4*cc + 3];
}
}
}