matrix windows with column % 128 == 64

Martin Albrecht reporter

This bug is because of an undocumented requirement that columns need to be multiples of 128 (not only of 64). This is because we SSE2 in some routines and those routines expect inputs to be 128-bit aligned.

Fix: we'd need to make sure our M4RI tables are aligned properly with the input instead of simply assuming that the input is 16-byte aligned (create tables and then make appropriate windows).

Workaround: If performance is not much of an issue, then ./configure --disable-sse2 also works, which disables the use SS2. To debug this issue, try ./configure --enable-debug --enable-debug-mzd

2016-03-24T16:04:11+00:00

Comments (2)

Martin Albrecht reporter
This bug is because of an undocumented requirement that columns need to be multiples of 128 (not only of 64). This is because we SSE2 in some routines and those routines expect inputs to be 128-bit aligned.

Fix: we'd need to make sure our M4RI tables are aligned properly with the input instead of simply assuming that the input is 16-byte aligned (create tables and then make appropriate windows).

Workaround: If performance is not much of an issue, then ./configure --disable-sse2 also works, which disables the use SS2. To debug this issue, try ./configure --enable-debug --enable-debug-mzd
- 2016-03-24T16:04:11+00:00
Martin Albrecht reporter
- changed status to resolved
fix _mzd_echelonize_m4ri for columns%128 == 64

this fixes ~~#63~~

→ <<cset def875e64e38>>
- 2016-03-24T16:32:37+00:00
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