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ghash-armv4.pl: excuse myself from implementing "528B" flavour.

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This commit is contained in:
Andy Polyakov 2010-07-02 08:14:12 +00:00
parent b28750877c
commit acbcc271b1
1 changed files with 10 additions and 0 deletions
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10
crypto/modes/asm/ghash-armv4.pl
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@ -19,6 +19,16 @@
# loop, this assembler loop body was found to be ~3x smaller than
# compiler-generated one...
#
# Note about "528B" variant. In ARM case it makes lesser sense to
# implement it for following reasons:
#
# - performance improvement won't be anywhere near 50%, because 128-
# bit shift operation is neatly fused with 128-bit xor here, and
# "538B" variant would eliminate only 4-5 instructions out of 32
# in the inner loop (meaning that estimated improvement is ~15%);
# - ARM-based systems are often embedded ones and extra memory
# consumption might be unappreciated (for so little improvement);
#
# Byte order [in]dependence. =========================================
#
# Caller is expected to maintain specific *dword* order in Htable,