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feat: Use a secondary simd_sum instead of a for loop

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Branch: GraniteFourPerf

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>
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Gabe Goodhart
2025-07-22 09:13:45 -06:00
parent 3866f766fe
commit 641276a816
1 changed files with 10 additions and 7 deletions
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17
ggml/src/ggml-metal/ggml-metal.metal
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@@ -1840,16 +1840,19 @@ kernel void kernel_ssm_scan_f32_group(
// sum of the individual simd groups.
threadgroup_barrier(mem_flags::mem_threadgroup);
// Sum the simd buckets => threadgroup sum
// For simd group 0 at indices < num simd groups, extract the shared
// simd sum
sumf = 0.0f;
for (int64_t i0 = 0; i0 < sgptg; ++i0) {
sumf += shared[i0];
if (sgitg == 0) {
if (tiisg < sgptg) {
sumf = shared[tiisg];
}
sumf = simd_sum(sumf);
if (tiisg == 0) {
y[0] = sumf;
}
}
threadgroup_barrier(mem_flags::mem_threadgroup);
y[0] = sumf;
// recurse
s0 = s;
}