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ARMv4 assembly pack: add Cortex-A15 performance data.

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(Imported from upstream's e390ae50e0bc41676994c6fa23f7b65a8afc4d7f)

Change-Id: Ifee85b0936c06c42cc7c09f8327d15fec51da48a
Reviewed-on: https://boringssl-review.googlesource.com/3832
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
David Benjamin 2015-03-09 14:51:51 -04:00 committed by Adam Langley
parent 5a93342fab
commit 389939422a
3 changed files with 8 additions and 13 deletions
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4
crypto/modes/asm/ghash-armv4.pl
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@ -42,8 +42,8 @@
# below and combine it with reduction algorithm from x86 module.
# Performance improvement over previous version varies from 65% on
# Snapdragon S4 to 110% on Cortex A9. In absolute terms Cortex A8
# processes one byte in 8.45 cycles, A9 - in 10.2, Snapdragon S4 -
# in 9.33.
# processes one byte in 8.45 cycles, A9 - in 10.2, A15 - in 7.63,
# Snapdragon S4 - in 9.33.
#
# Câmara, D.; Gouvêa, C. P. L.; López, J. & Dahab, R.: Fast Software
# Polynomial Multiplication on ARM Processors using the NEON Engine.

4
crypto/sha/asm/sha1-armv4-large.pl
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@ -60,7 +60,9 @@
# is ~2.5x larger and there are some redundant instructions executed
# when processing last block, improvement is not as big for smallest
# blocks, only ~30%. Snapdragon S4 is a tad faster, 6.4 cycles per
# byte, which is also >80% faster than integer-only code.
# byte, which is also >80% faster than integer-only code. Cortex-A15
# is even faster spending 5.6 cycles per byte outperforming integer-
# only code by factor of 2.
# May 2014.
#

13
crypto/sha/asm/sha512-armv4.pl
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@ -34,16 +34,9 @@
# terms it's 22.6 cycles per byte, which is disappointing result.
# Technical writers asserted that 3-way S4 pipeline can sustain
# multiple NEON instructions per cycle, but dual NEON issue could
# not be observed, and for NEON-only sequences IPC(*) was found to
# be limited by 1:-( 0.33 and 0.66 were measured for sequences with
# ILPs(*) of 1 and 2 respectively. This in turn means that you can
# even find yourself striving, as I did here, for achieving IPC
# adequate to one delivered by Cortex A8 [for reference, it's
# 0.5 for ILP of 1, and 1 for higher ILPs].
#
# (*) ILP, instruction-level parallelism, how many instructions
# *can* execute at the same time. IPC, instructions per cycle,
# indicates how many instructions actually execute.
# not be observed, see http://www.openssl.org/~appro/Snapdragon-S4.html
# for further details. On side note Cortex-A15 processes one byte in
# 16 cycles.
# Byte order [in]dependence. =========================================
#