+++ /dev/null
-#!/usr/bin/env perl
-#
-# ====================================================================
-# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
-# project. Rights for redistribution and usage in source and binary
-# forms are granted according to the OpenSSL license.
-# ====================================================================
-#
-# 2.22x RC4 tune-up:-) It should be noted though that my hand [as in
-# "hand-coded assembler"] doesn't stand for the whole improvement
-# coefficient. It turned out that eliminating RC4_CHAR from config
-# line results in ~40% improvement (yes, even for C implementation).
-# Presumably it has everything to do with AMD cache architecture and
-# RAW or whatever penalties. Once again! The module *requires* config
-# line *without* RC4_CHAR! As for coding "secret," I bet on partial
-# register arithmetics. For example instead of 'inc %r8; and $255,%r8'
-# I simply 'inc %r8b'. Even though optimization manual discourages
-# to operate on partial registers, it turned out to be the best bet.
-# At least for AMD... How IA32E would perform remains to be seen...
-
-# As was shown by Marc Bevand reordering of couple of load operations
-# results in even higher performance gain of 3.3x:-) At least on
-# Opteron... For reference, 1x in this case is RC4_CHAR C-code
-# compiled with gcc 3.3.2, which performs at ~54MBps per 1GHz clock.
-# Latter means that if you want to *estimate* what to expect from
-# *your* CPU, then multiply 54 by 3.3 and clock frequency in GHz.
-
-# Intel P4 EM64T core was found to run the AMD64 code really slow...
-# The only way to achieve comparable performance on P4 is to keep
-# RC4_CHAR. Kind of ironic, huh? As it's apparently impossible to
-# compose blended code, which would perform even within 30% marginal
-# on either AMD and Intel platforms, I implement both cases. See
-# rc4_skey.c for further details... This applies to 0.9.8 and later.
-# In 0.9.7 context RC4_CHAR codepath is never engaged and ~70 bytes
-# of code remain redundant.
-
-$output=shift;
-open STDOUT,"| $^X ../perlasm/x86_64-xlate.pl $output";
-
-$dat="%rdi"; # arg1
-$len="%rsi"; # arg2
-$inp="%rdx"; # arg3
-$out="%rcx"; # arg4
-
-$XX="%r10";
-$TX="%r8";
-$YY="%r11";
-$TY="%r9";
-
-$code=<<___;
-.text
-
-.globl RC4
-.type RC4,\@function,4
-.align 16
-RC4: or $len,$len
- jne .Lentry
- ret
-.Lentry:
- add \$8,$dat
- movl -8($dat),$XX#d
- movl -4($dat),$YY#d
- cmpl \$-1,256($dat)
- je .LRC4_CHAR
- test \$-8,$len
- jz .Lloop1
-.align 16
-.Lloop8:
- inc $XX#b
- movl ($dat,$XX,4),$TX#d
- add $TX#b,$YY#b
- movl ($dat,$YY,4),$TY#d
- movl $TX#d,($dat,$YY,4)
- movl $TY#d,($dat,$XX,4)
- add $TX#b,$TY#b
- inc $XX#b
- movl ($dat,$XX,4),$TX#d
- movb ($dat,$TY,4),%al
-___
-for ($i=1;$i<=6;$i++) {
-$code.=<<___;
- add $TX#b,$YY#b
- ror \$8,%rax
- movl ($dat,$YY,4),$TY#d
- movl $TX#d,($dat,$YY,4)
- movl $TY#d,($dat,$XX,4)
- add $TX#b,$TY#b
- inc $XX#b
- movl ($dat,$XX,4),$TX#d
- movb ($dat,$TY,4),%al
-___
-}
-$code.=<<___;
- add $TX#b,$YY#b
- ror \$8,%rax
- movl ($dat,$YY,4),$TY#d
- movl $TX#d,($dat,$YY,4)
- movl $TY#d,($dat,$XX,4)
- sub \$8,$len
- add $TY#b,$TX#b
- movb ($dat,$TX,4),%al
- ror \$8,%rax
- add \$8,$inp
- add \$8,$out
-
- xor -8($inp),%rax
- mov %rax,-8($out)
-
- test \$-8,$len
- jnz .Lloop8
- cmp \$0,$len
- jne .Lloop1
-.Lexit:
- movl $XX#d,-8($dat)
- movl $YY#d,-4($dat)
- ret
-.align 16
-.Lloop1:
- movzb ($inp),%eax
- inc $XX#b
- movl ($dat,$XX,4),$TX#d
- add $TX#b,$YY#b
- movl ($dat,$YY,4),$TY#d
- movl $TX#d,($dat,$YY,4)
- movl $TY#d,($dat,$XX,4)
- add $TY#b,$TX#b
- movl ($dat,$TX,4),$TY#d
- xor $TY,%rax
- inc $inp
- movb %al,($out)
- inc $out
- dec $len
- jnz .Lloop1
- jmp .Lexit
-
-.align 16
-.LRC4_CHAR:
- add \$1,$XX#b
- movzb ($dat,$XX),$TX#d
- add $TX#b,$YY#b
- movzb ($dat,$YY),$TY#d
- movb $TX#b,($dat,$YY)
- movb $TY#b,($dat,$XX)
- add $TX#b,$TY#b
- movzb ($dat,$TY),$TY#d
- xorb ($inp),$TY#b
- movb $TY#b,($out)
- lea 1($inp),$inp
- lea 1($out),$out
- sub \$1,$len
- jnz .LRC4_CHAR
- jmp .Lexit
-.size RC4,.-RC4
-___
-
-$code =~ s/#([bwd])/$1/gm;
-
-print $code;
-
-close STDOUT;
projects / openssl.git / blobdiff