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Faster INTT on AArch64 by more efficient reduction #773

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Faster INTT on AArch64 by more efficient reduction #773

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22 changes: 13 additions & 9 deletions dev/aarch64_clean/src/intt.S
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Original file line number Diff line number Diff line change
Expand Up @@ -267,21 +267,25 @@ layer4567_start:
// Layer 5
gs_butterfly data0, data1, root0, 2, 3
gs_butterfly data2, data3, root0, 4, 5
// Max bound: 8q
// data0, data2: < 8q
// data1, data3: < q

// Not all of those reductions are needed, but the bounds tracking
// is easier if we uniformly reduce at this point.
// data0 and data2 have reached a bound of 8q now, so
// reduction of them is required.
barrett_reduce data0
barrett_reduce data2
barrett_reduce data1
barrett_reduce data3

// Bounds: q/2
// data0, data2: < q/2
// data1, data3: < q

// Layer 4
gs_butterfly data0, data2, root0, 0, 1
gs_butterfly data1, data3, root0, 0, 1
// Bounds: < q
// data0, data2, data3: < q
// data1: < 2q

barrett_reduce data1
// data1: < q/2 < q
// data0, data2, data3: < q
// Therefore, all < q

str q_data0, [inp], #(64)
str q_data1, [inp, #(-64 + 16*1)]
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