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metal : reduce branches

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Georgi Gerganov 2024-01-21 11:38:17 +02:00
parent 528da7515e
commit 52ae085750
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1 changed files with 8 additions and 22 deletions
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@ -2056,40 +2056,26 @@ kernel void kernel_flash_attn_ext_f16(
continue; continue;
} }
half4 s4 = 0.0f; device const half4 * pk4 = (device const half4 *) ((device char *) k + (ic*nb11 + ik2*nb12 + ik3*nb13));
device const half4 * pv4 = (device const half4 *) ((device char *) v + (ic*nb21 + iv2*nb22 + iv3*nb23));
device const half4 * pk4 = (device const half4 *) ((device char *) k + ( ic*nb11 + ik2*nb12 + ik3*nb13)); half4 s4 = 0.0h;
for (int64_t d = 0; d < D4; ++d) { for (int64_t d = 0; d < D4; ++d) {
s4 += pk4[d] * pq4[d]; s4 += pk4[d] * pq4[d];
} }
half s = s4.x + s4.y + s4.z + s4.w; half s = (s4.x + s4.y + s4.z + s4.w)*scale + mv;
s = s*scale + mv;
const half Mold = M; const half Mold = M;
half ms = 1.0f; M = max(M, s);
half vs = 1.0f;
if (s > M) { const half ms = exp(Mold - M);
M = s; const half vs = exp(s - M);
ms = exp(Mold - M);
// V = V*exp(Mold - M)
for (int64_t d = 0; d < D4; ++d) {
V16[d] *= ms;
}
} else {
vs = exp(s - M);
}
device const half4 * pv4 = (device const half4 *) ((device char *) v + (ic*nb21 + iv2*nb22 + iv3*nb23));
// V += v*exp(s - M)
for (int64_t d = 0; d < D4; ++d) { for (int64_t d = 0; d < D4; ++d) {
V16[d] += pv4[d] * vs; V16[d] = V16[d]*ms + pv4[d]*vs;
} }
S = S*ms + vs; S = S*ms + vs;