--- /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;
+
+$win64a=1 if ($output =~ /win64a.[s|asm]/);
+
+open STDOUT,">$output" || die "can't open $output: $!";
+
+if (defined($win64a)) {
+ $dat="%rcx"; # arg1
+ $len="%rdx"; # arg2
+ $inp="%rsi"; # r8, arg3 moves here
+ $out="%rdi"; # r9, arg4 moves here
+} else {
+ $dat="%rdi"; # arg1
+ $len="%rsi"; # arg2
+ $inp="%rdx"; # arg3
+ $out="%rcx"; # arg4
+}
+
+$XX="%r10";
+$TX="%r8";
+$YY="%r11";
+$TY="%r9";
+
+sub PTR() {
+ my $ret=shift;
+ if (defined($win64a)) {
+ $ret =~ s/\[([\S]+)\+([\S]+)\]/[$2+$1]/g; # [%rN+%rM*4]->[%rM*4+%rN]
+ $ret =~ s/:([^\[]+)\[([^\]]+)\]/:[$2+$1]/g; # :off[ea]->:[ea+off]
+ } else {
+ $ret =~ s/[\+\*]/,/g; # [%rN+%rM*4]->[%rN,%rM,4]
+ $ret =~ s/\[([^\]]+)\]/($1)/g; # [%rN]->(%rN)
+ }
+ $ret;
+}
+
+$code=<<___ if (!defined($win64a));
+.text
+
+.globl RC4
+.type RC4,\@function
+.align 16
+RC4: or $len,$len
+ jne .Lentry
+ repret
+.Lentry:
+___
+$code=<<___ if (defined($win64a));
+_TEXT SEGMENT
+PUBLIC RC4
+ALIGN 16
+RC4 PROC
+ or $len,$len
+ jne .Lentry
+ repret
+.Lentry:
+ push %rdi
+ push %rsi
+ sub \$40,%rsp
+ mov %r8,$inp
+ mov %r9,$out
+___
+$code.=<<___;
+ add \$8,$dat
+ movl `&PTR("DWORD:-8[$dat]")`,$XX#d
+ movl `&PTR("DWORD:-4[$dat]")`,$YY#d
+ cmpl \$-1,`&PTR("DWORD:256[$dat]")`
+ je .LRC4_CHAR
+ test \$-8,$len
+ jz .Lloop1
+.align 16
+.Lloop8:
+ inc $XX#b
+ movl `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
+ add $TX#b,$YY#b
+ movl `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
+ movl $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
+ movl $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+ add $TX#b,$TY#b
+ inc $XX#b
+ movl `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
+ movb `&PTR("BYTE:[$dat+$TY*4]")`,%al
+___
+for ($i=1;$i<=6;$i++) {
+$code.=<<___;
+ add $TX#b,$YY#b
+ ror \$8,%rax
+ movl `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
+ movl $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
+ movl $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+ add $TX#b,$TY#b
+ inc $XX#b
+ movl `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
+ movb `&PTR("BYTE:[$dat+$TY*4]")`,%al
+___
+}
+$code.=<<___;
+ add $TX#b,$YY#b
+ ror \$8,%rax
+ movl `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
+ movl $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
+ movl $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+ sub \$8,$len
+ add $TY#b,$TX#b
+ movb `&PTR("BYTE:[$dat+$TX*4]")`,%al
+ ror \$8,%rax
+ add \$8,$inp
+ add \$8,$out
+
+ xor `&PTR("QWORD:-8[$inp]")`,%rax
+ mov %rax,`&PTR("QWORD:-8[$out]")`
+
+ test \$-8,$len
+ jnz .Lloop8
+ cmp \$0,$len
+ jne .Lloop1
+.Lexit:
+ movl $XX#d,`&PTR("DWORD:-8[$dat]")`
+ movl $YY#d,`&PTR("DWORD:-4[$dat]")`
+___
+$code.=<<___ if (defined($win64a));
+ add \$40,%rsp
+ pop %rsi
+ pop %rdi
+___
+$code.=<<___;
+ repret
+.align 16
+.Lloop1:
+ movzb `&PTR("BYTE:[$inp]")`,%eax
+ inc $XX#b
+ movl `&PTR("DWORD:[$dat+$XX*4]")`,$TX#d
+ add $TX#b,$YY#b
+ movl `&PTR("DWORD:[$dat+$YY*4]")`,$TY#d
+ movl $TX#d,`&PTR("DWORD:[$dat+$YY*4]")`
+ movl $TY#d,`&PTR("DWORD:[$dat+$XX*4]")`
+ add $TY#b,$TX#b
+ movl `&PTR("DWORD:[$dat+$TX*4]")`,$TY#d
+ xor $TY,%rax
+ inc $inp
+ movb %al,`&PTR("BYTE:[$out]")`
+ inc $out
+ dec $len
+ jnz .Lloop1
+ jmp .Lexit
+
+.align 16
+.LRC4_CHAR:
+ inc $XX#b
+ movzb `&PTR("BYTE:[$dat+$XX]")`,$TX#d
+ add $TX#b,$YY#b
+ movzb `&PTR("BYTE:[$dat+$YY]")`,$TY#d
+ movb $TX#b,`&PTR("BYTE:[$dat+$YY]")`
+ movb $TY#b,`&PTR("BYTE:[$dat+$XX]")`
+ add $TX#b,$TY#b
+ movzb `&PTR("BYTE:[$dat+$TY]")`,$TY#d
+ xorb `&PTR("BYTE:[$inp]")`,$TY#b
+ movb $TY#b,`&PTR("BYTE:[$out]")`
+ inc $inp
+ inc $out
+ dec $len
+ jnz .LRC4_CHAR
+ jmp .Lexit
+___
+$code.=<<___ if (defined($win64a));
+RC4 ENDP
+_TEXT ENDS
+END
+___
+$code.=<<___ if (!defined($win64a));
+.size RC4,.-RC4
+___
+
+$code =~ s/#([bwd])/$1/gm;
+$code =~ s/\`([^\`]*)\`/eval $1/gem;
+
+if (defined($win64a)) {
+ $code =~ s/\.align/ALIGN/gm;
+ $code =~ s/[\$%]//gm;
+ $code =~ s/\.L/\$L/gm;
+ $code =~ s/([\w]+)([\s]+)([\S]+),([\S]+)/$1$2$4,$3/gm;
+ $code =~ s/([QD]*WORD|BYTE):/$1 PTR/gm;
+ $code =~ s/mov[bwlq]/mov/gm;
+ $code =~ s/movzb/movzx/gm;
+ $code =~ s/repret/DB\t0F3h,0C3h/gm;
+ $code =~ s/cmpl/cmp/gm;
+ $code =~ s/xorb/xor/gm;
+} else {
+ $code =~ s/([QD]*WORD|BYTE)://gm;
+ $code =~ s/repret/.byte\t0xF3,0xC3/gm;
+}
+print $code;
projects / bcm963xx.git / blobdiff