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Brian Smith
nettle
Commits
0984849e
Commit
0984849e
authored
Feb 07, 2011
by
Niels Möller
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Rev: nettle/ChangeLog:1.136
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ChangeLog
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0984849e
2011-02-07 Niels Mller <nisse@lysator.liu.se>
Introduced 4-bit tables. If enabled, gives gmac performance of 19
* gcm.c (gcm_gf_mul_chunk): Special case first and last iteration.
(gcm_gf_add): New function, a special case of memxor. Use it for
all memxor calls with word-aligned 16 byte blocks. Improves
performance to 152 cycles/byte with no tables, 28 cycles per byte
with 4-bit tables and 10.5 cycles per byte with 8-bit tables.
Introduced 8-bit tables. If enabled, gives gmac performance of 19
cycles per byte (still on intel x86_64).
* gcm.c (gcm_gf_shift_chunk): New implementation for 8-bit tables.
(gcm_gf_mul_chunk): Likewise.
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