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libbb/sha1: x86_64 version: tidying up, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2022-01-03 17:02:48 +01:00
parent 4387077f8e
commit 7abb2bb96e
2 changed files with 36 additions and 29 deletions
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25
libbb/hash_md5_sha_x86-64.S.sh
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@ -74,22 +74,24 @@ test "$1" -ge 8 && echo "%r${1}d"
RD1A() {
local a=$1;local b=$2;local c=$3;local d=$4;local e=$5
local n=$(($6))
echo "# $n"
test $n = 0 && echo "
local n0=$(((n+0) & 15))
echo "
# $n
";test $n0 = 0 && echo "
# W[0], already in %esi
";test $n != 0 && test $n -lt 8 && echo "
movl `W32 $n`, %esi # W[n]
";test $n -ge 8 && echo "
# W[n], in %r$n
";test $n0 != 0 && test $n0 -lt 8 && echo "
movl `W32 $n0`, %esi # W[n]
";test $n0 -ge 8 && echo "
# W[n], in %r$n0
";echo "
movl %e$c, %edi # c
xorl %e$d, %edi # ^d
andl %e$b, %edi # &b
xorl %e$d, %edi # (((c ^ d) & b) ^ d)
";test $n -lt 8 && echo "
";test $n0 -lt 8 && echo "
leal $RCONST(%r$e,%rsi), %e$e # e += RCONST + W[n]
";test $n -ge 8 && echo "
leal $RCONST(%r$e,%r$n),%e$e # e += RCONST + W[n]
";test $n0 -ge 8 && echo "
leal $RCONST(%r$e,%r$n0), %e$e # e += RCONST + W[n]
";echo "
addl %edi, %e$e # e += (((c ^ d) & b) ^ d)
movl %e$a, %esi #
@ -246,6 +248,11 @@ RD2 ax bx cx dx bp 60; RD2 bp ax bx cx dx 61; RD2 dx bp ax bx cx 62; RD2 cx dx b
RD2 ax bx cx dx bp 65; RD2 bp ax bx cx dx 66; RD2 dx bp ax bx cx 67; RD2 cx dx bp ax bx 68; RD2 bx cx dx bp ax 69
RD2 ax bx cx dx bp 70; RD2 bp ax bx cx dx 71; RD2 dx bp ax bx cx 72; RD2 cx dx bp ax bx 73; RD2 bx cx dx bp ax 74
RD2 ax bx cx dx bp 75; RD2 bp ax bx cx dx 76; RD2 dx bp ax bx cx 77; RD2 cx dx bp ax bx 78; RD2 bx cx dx bp ax 79
# Note: new W[n&15] values generated in last 3 iterations
# (W[13,14,15]) are unused after each of these iterations.
# Since we use r8..r15 for W[8..15], this does not matter.
# If we switch to e.g. using r8..r15 for W[0..7], then saving of W[13,14,15]
# (the "movl %esi, `W32 $n0`" insn) is a dead store and can be removed.
} | grep -v '^$'
echo "