Mini Shell
#!/usr/bin/env perl
#
# ====================================================================
# Written by Andy Polyakov, @dot-asm, initially for use with OpenSSL.
# ====================================================================
#
# ChaCha20 for Itanium.
#
# March 2019
#
# Itanium 9xxx, which has pair of shifters, manages to process one byte
# in 9.3 cycles. This aligns perfectly with theoretical estimate.
# On the other hand, pre-9000 CPU has single shifter and each extr/dep
# pairs below takes additional cycle. Then final input->xor->output
# pass runs slower than expected... Overall result is 15.6 cpb, two
# cycles more than theoretical estimate.
$output = pop and open STDOUT, ">$output";
my @k = map("r$_",(16..31));
my @x = map("r$_",(38..53));
my @y = map("r$_",(8..11));
my @z = map("r$_",(15,35..37));
my ($out,$inp,$len,$key,$counter) = map("r$_",(32..36));
$code.=<<___;
#if defined(_HPUX_SOURCE)
# if !defined(_LP64)
# define ADDP addp4
# else
# define ADDP add
# endif
#else
# define ADDP add
#endif
.text
.global ChaCha20_ctr32#
.proc ChaCha20_ctr32#
.align 32
ChaCha20_ctr32:
.prologue
.save ar.pfs,r2
{ .mmi; alloc r2=ar.pfs,5,17,0,0
ADDP @k[11]=4,$key
.save ar.lc,r3
mov r3=ar.lc }
{ .mmi; ADDP $out=0,$out
ADDP $inp=0,$inp }
{ .mmi; ADDP $key=0,$key
ADDP $counter=0,$counter
.save pr,r14
mov r14=pr };;
.body
{ .mlx; ld4 @k[4]=[$key],8
movl @k[0]=0x61707865 }
{ .mlx; ld4 @k[5]=[@k[11]],8
movl @k[1]=0x3320646e };;
{ .mlx; ld4 @k[6]=[$key],8
movl @k[2]=0x79622d32 }
{ .mlx; ld4 @k[7]=[@k[11]],8
movl @k[3]=0x6b206574 };;
{ .mmi; ld4 @k[8]=[$key],8
ld4 @k[9]=[@k[11]],8
add @k[15]=4,$counter };;
{ .mmi; ld4 @k[10]=[$key]
ld4 @k[11]=[@k[11]]
mov @x[0]=@k[0] };;
{ .mmi; ld4 @k[12]=[$counter],8
ld4 @k[13]=[@k[15]],8
mov @x[1]=@k[1] };;
{ .mmi; ld4 @k[14]=[$counter]
ld4 @k[15]=[@k[15]]
mov @x[2]=@k[2] }
{ .mmi; mov @x[3]=@k[3]
mov @x[4]=@k[4]
mov @x[5]=@k[5] };;
{ .mmi; mov @x[6]=@k[6]
mov @x[7]=@k[7]
mov @x[8]=@k[8] }
{ .mmi; mov @x[9]=@k[9]
mov @x[10]=@k[10]
mov @x[11]=@k[11] }
{ .mmi; mov @x[12]=@k[12]
mov @x[13]=@k[13]
mov @x[14]=@k[14] };;
.Loop_outer:
{ .mii; mov @x[15]=@k[15]
mov ar.lc=9
mov ar.ec=1 }
{ .mmb; cmp.geu p6,p0=64,$len
sub @z[1]=64,$len
brp.loop.imp .Loop_top,.Loop_end-16 };;
.Loop_top:
___
sub ROUND {
my ($a0,$b0,$c0,$d0)=@_;
my ($a1,$b1,$c1,$d1)=map(($_&~3)+(($_+1)&3),($a0,$b0,$c0,$d0));
my ($a2,$b2,$c2,$d2)=map(($_&~3)+(($_+1)&3),($a1,$b1,$c1,$d1));
my ($a3,$b3,$c3,$d3)=map(($_&~3)+(($_+1)&3),($a2,$b2,$c2,$d2));
$code.=<<___;
{ .mmi; add @x[$a0]=@x[$a0],@x[$b0]
add @x[$a1]=@x[$a1],@x[$b1]
add @x[$a2]=@x[$a2],@x[$b2] };;
{ .mmi; add @x[$a3]=@x[$a3],@x[$b3]
xor @x[$d0]=@x[$d0],@x[$a0]
xor @x[$d1]=@x[$d1],@x[$a1] };;
{ .mmi; xor @x[$d2]=@x[$d2],@x[$a2]
xor @x[$d3]=@x[$d3],@x[$a3]
extr.u @y[0]=@x[$d0],16,16 };;
{ .mii; extr.u @y[1]=@x[$d1],16,16
dep @x[$d0]=@x[$d0],@y[0],16,16 };;
{ .mii; add @x[$c0]=@x[$c0],@x[$d0]
extr.u @y[2]=@x[$d2],16,16
dep @x[$d1]=@x[$d1],@y[1],16,16 };;
{ .mii; add @x[$c1]=@x[$c1],@x[$d1]
xor @x[$b0]=@x[$b0],@x[$c0]
extr.u @y[3]=@x[$d3],16,16 };;
{ .mii; xor @x[$b1]=@x[$b1],@x[$c1]
dep @x[$d2]=@x[$d2],@y[2],16,16
dep @x[$d3]=@x[$d3],@y[3],16,16 };;
{ .mmi; add @x[$c2]=@x[$c2],@x[$d2]
add @x[$c3]=@x[$c3],@x[$d3]
extr.u @y[0]=@x[$b0],20,12 };;
{ .mmi; xor @x[$b2]=@x[$b2],@x[$c2]
xor @x[$b3]=@x[$b3],@x[$c3]
dep.z @x[$b0]=@x[$b0],12,20 };;
{ .mii; or @x[$b0]=@x[$b0],@y[0]
extr.u @y[1]=@x[$b1],20,12
dep.z @x[$b1]=@x[$b1],12,20 };;
{ .mii; add @x[$a0]=@x[$a0],@x[$b0]
extr.u @y[2]=@x[$b2],20,12
extr.u @y[3]=@x[$b3],20,12 }
{ .mii; or @x[$b1]=@x[$b1],@y[1]
dep.z @x[$b2]=@x[$b2],12,20
dep.z @x[$b3]=@x[$b3],12,20 };;
{ .mmi; or @x[$b2]=@x[$b2],@y[2]
or @x[$b3]=@x[$b3],@y[3]
add @x[$a1]=@x[$a1],@x[$b1] };;
{ .mmi; add @x[$a2]=@x[$a2],@x[$b2]
add @x[$a3]=@x[$a3],@x[$b3]
xor @x[$d0]=@x[$d0],@x[$a0] };;
{ .mii; xor @x[$d1]=@x[$d1],@x[$a1]
extr.u @y[0]=@x[$d0],24,8
dep.z @x[$d0]=@x[$d0],8,24 };;
{ .mii; or @x[$d0]=@x[$d0],@y[0]
extr.u @y[1]=@x[$d1],24,8
dep.z @x[$d1]=@x[$d1],8,24 };;
{ .mmi; or @x[$d1]=@x[$d1],@y[1]
xor @x[$d2]=@x[$d2],@x[$a2]
xor @x[$d3]=@x[$d3],@x[$a3] };;
{ .mii; add @x[$c0]=@x[$c0],@x[$d0]
extr.u @y[2]=@x[$d2],24,8
dep.z @x[$d2]=@x[$d2],8,24 };;
{ .mii; xor @x[$b0]=@x[$b0],@x[$c0]
extr.u @y[3]=@x[$d3],24,8
dep.z @x[$d3]=@x[$d3],8,24 };;
{ .mmi; or @x[$d2]=@x[$d2],@y[2]
or @x[$d3]=@x[$d3],@y[3]
extr.u @y[0]=@x[$b0],25,7 };;
{ .mmi; add @x[$c1]=@x[$c1],@x[$d1]
add @x[$c2]=@x[$c2],@x[$d2]
dep.z @x[$b0]=@x[$b0],7,25 };;
{ .mmi; xor @x[$b1]=@x[$b1],@x[$c1]
xor @x[$b2]=@x[$b2],@x[$c2]
add @x[$c3]=@x[$c3],@x[$d3] };;
{ .mii; xor @x[$b3]=@x[$b3],@x[$c3]
extr.u @y[1]=@x[$b1],25,7
dep.z @x[$b1]=@x[$b1],7,25 };;
{ .mii; or @x[$b0]=@x[$b0],@y[0]
extr.u @y[2]=@x[$b2],25,7
dep.z @x[$b2]=@x[$b2],7,25 };;
{ .mii; or @x[$b1]=@x[$b1],@y[1]
extr.u @y[3]=@x[$b3],25,7
dep.z @x[$b3]=@x[$b3],7,25 };;
___
$code.=<<___ if ($d0 == 12);
{ .mmi; or @x[$b2]=@x[$b2],@y[2]
or @x[$b3]=@x[$b3],@y[3]
mov @z[0]=-1 };;
___
$code.=<<___ if ($d0 == 15);
{ .mmb; or @x[$b2]=@x[$b2],@y[2]
or @x[$b3]=@x[$b3],@y[3]
br.ctop.sptk .Loop_top };;
___
}
&ROUND(0, 4, 8, 12);
&ROUND(0, 5, 10, 15);
$code.=<<___;
.Loop_end:
{ .mmi; add @x[0]=@x[0],@k[0]
add @x[1]=@x[1],@k[1]
(p6) shr.u @z[0]=@z[0],@z[1] }
{ .mmb; add @x[2]=@x[2],@k[2]
add @x[3]=@x[3],@k[3]
clrrrb.pr };;
{ .mmi; add @x[4]=@x[4],@k[4]
add @x[5]=@x[5],@k[5]
add @x[6]=@x[6],@k[6] }
{ .mmi; add @x[7]=@x[7],@k[7]
add @x[8]=@x[8],@k[8]
add @x[9]=@x[9],@k[9] }
{ .mmi; add @x[10]=@x[10],@k[10]
add @x[11]=@x[11],@k[11]
add @x[12]=@x[12],@k[12] }
{ .mmi; add @x[13]=@x[13],@k[13]
add @x[14]=@x[14],@k[14]
add @x[15]=@x[15],@k[15] }
{ .mmi; add @k[12]=1,@k[12] // next counter
mov pr=@z[0],0x1ffff };;
//////////////////////////////////////////////////////////////////
// Each predicate bit corresponds to byte to be processed. Note
// that p0 is wired to 1, but it works out, because there always
// is at least one byte to process...
{ .mmi; (p0) ld1 @z[0]=[$inp],1
shr.u @y[1]=@x[0],8 };;
{ .mmi; (p1) ld1 @z[1]=[$inp],1
(p2) shr.u @y[2]=@x[0],16 };;
{ .mmi; (p2) ld1 @z[2]=[$inp],1
(p0) xor @z[0]=@z[0],@x[0]
(p3) shr.u @y[3]=@x[0],24 };;
___
for(my $i0=0; $i0<60; $i0+=4) {
my ($i1, $i2, $i3, $i4, $i5, $i6, $i7) = map($i0+$_,(1..7));
my $k = $i0/4+1;
$code.=<<___;
{ .mmi; (p$i3) ld1 @z[3]=[$inp],1
(p$i0) st1 [$out]=@z[0],1
(p$i1) xor @z[1]=@z[1],@y[1] };;
{ .mmi; (p$i4) ld1 @z[0]=[$inp],1
(p$i5) shr.u @y[1]=@x[$k],8 }
{ .mmi; (p$i1) st1 [$out]=@z[1],1
(p$i2) xor @z[2]=@z[2],@y[2]
(p1) mov @x[$k-1]=@k[$k-1] };;
{ .mfi; (p$i5) ld1 @z[1]=[$inp],1
(p$i6) shr.u @y[2]=@x[$k],16 }
{ .mfi; (p$i2) st1 [$out]=@z[2],1
(p$i3) xor @z[3]=@z[3],@y[3] };;
{ .mfi; (p$i6) ld1 @z[2]=[$inp],1
(p$i7) shr.u @y[3]=@x[$k],24 }
___
$code.=<<___ if ($i0==0); # p1,p2 are available for reuse in first round
{ .mmi; (p$i3) st1 [$out]=@z[3],1
(p$i4) xor @z[0]=@z[0],@x[$k]
cmp.ltu p1,p2=64,$len };;
___
$code.=<<___ if ($i0>0);
{ .mfi; (p$i3) st1 [$out]=@z[3],1
(p$i4) xor @z[0]=@z[0],@x[$k] };;
___
}
$code.=<<___;
{ .mmi; (p63) ld1 @z[3]=[$inp],1
(p60) st1 [$out]=@z[0],1
(p61) xor @z[1]=@z[1],@y[1] };;
{ .mmi; (p61) st1 [$out]=@z[1],1
(p62) xor @z[2]=@z[2],@y[2] };;
{ .mmi; (p62) st1 [$out]=@z[2],1
(p63) xor @z[3]=@z[3],@y[3]
(p2) mov ar.lc=r3 };;
{ .mib; (p63) st1 [$out]=@z[3],1
(p1) add $len=-64,$len
(p1) br.dptk.many .Loop_outer };;
{ .mmi; mov @k[4]=0 // wipe key material
mov @k[5]=0
mov @k[6]=0 }
{ .mmi; mov @k[7]=0
mov @k[8]=0
mov @k[9]=0 }
{ .mmi; mov @k[10]=0
mov @k[11]=0
mov @k[12]=0 }
{ .mmi; mov @k[13]=0
mov @k[14]=0
mov @k[15]=0 }
{ .mib; mov pr=r14,0x1ffff
br.ret.sptk.many b0 };;
.endp ChaCha20_ctr32#
stringz "ChaCha20 for IA64, CRYPTOGAMS by \@dot-asm"
___
print $code;
close STDOUT or die "error closing STDOUT: $!";
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