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Minor performance improvements to x86-mont.pl.

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This commit is contained in:
Andy Polyakov 2006-12-28 12:43:16 +00:00
parent 8f2d60ec26
commit 4cfe3df1f5
1 changed files with 43 additions and 26 deletions
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69
crypto/bn/asm/x86-mont.pl
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@ -24,7 +24,7 @@
#
# Modulo-scheduling SSE2 loops results in further 15-20% improvement.
# Integer-only code [being equipped with dedicated squaring procedure]
# gives >=30% on rsa512 sign benchmark...
# gives ~40% on rsa512 sign benchmark...
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
push(@INC,"${dir}","${dir}../../perlasm");
@ -46,12 +46,12 @@ $rp="edi"; $bp="edi"; # overlapping variables!!!
$np="ebp";
$num="ebx";
$_rp=&DWP(4*0,"esp"); # stack top layout
$_ap=&DWP(4*1,"esp");
$_bp=&DWP(4*2,"esp");
$_np=&DWP(4*3,"esp");
$_n0=&DWP(4*4,"esp");
$_num=&DWP(4*5,"esp");
$_num=&DWP(4*0,"esp"); # stack top layout
$_rp=&DWP(4*1,"esp");
$_ap=&DWP(4*2,"esp");
$_bp=&DWP(4*3,"esp");
$_np=&DWP(4*4,"esp");
$_n0=&DWP(4*5,"esp");
$_sp=&DWP(4*6,"esp");
$_bpend=&DWP(4*7,"esp");
$frame=32; # size of above frame rounded up to 16n
@ -61,20 +61,37 @@ $frame=32; # size of above frame rounded up to 16n
&cmp ("edi",4);
&jl (&label("just_leave"));
################################# load argument block...
&mov ("eax",&wparam(0)); # BN_ULONG *rp
&mov ("ebx",&wparam(1)); # const BN_ULONG *ap
&mov ("ecx",&wparam(2)); # const BN_ULONG *bp
&mov ("edx",&wparam(3)); # const BN_ULONG *np
&mov ("esi",&wparam(4)); # const BN_ULONG *n0
#&mov ("edi",&wparam(5)); # int num
&lea ("esi",&wparam(0)); # put aside pointer to argument block
&lea ("edx",&wparam(1)); # load ap
&mov ("ebp","esp"); # saved stack pointer!
&add ("edi",2); # extra two words on top of tp
&neg ("edi");
&lea ("esp",&DWP(-$frame,"esp","edi",4)); # alloca($frame+4*(num+2))
&neg ("edi");
&and ("esp",-4096); # minimize TLB utilization
# minimize cache contention by arraning 2K window between stack
# pointer and ap argument [np is also position sensitive vector,
# but it's assumed to be near ap, as it's allocated at ~same
# time].
&mov ("eax","esp");
&sub ("eax","edx");
&and ("eax",2047);
&sub ("esp","eax"); # this aligns sp and ap modulo 2048
&xor ("edx","esp");
&and ("edx",2048);
&xor ("edx",2048);
&sub ("esp","edx"); # this splits them apart modulo 4096
&and ("esp",-64); # align to cache line
################################# load argument block...
&mov ("eax",&DWP(0*4,"esi"));# BN_ULONG *rp
&mov ("ebx",&DWP(1*4,"esi"));# const BN_ULONG *ap
&mov ("ecx",&DWP(2*4,"esi"));# const BN_ULONG *bp
&mov ("edx",&DWP(3*4,"esi"));# const BN_ULONG *np
&mov ("esi",&DWP(4*4,"esi"));# const BN_ULONG *n0
#&mov ("edi",&DWP(5*4,"esi"));# int num
&mov ("esi",&DWP(0,"esi")); # pull n0[0]
&mov ($_rp,"eax"); # ... save a copy of argument block
@ -131,7 +148,7 @@ $mask="mm7";
&psrlq ($car1,32);
&inc ($j); # j++
&set_label("1st");
&set_label("1st",16);
&pmuludq($acc0,$mul0); # ap[j]*bp[0]
&pmuludq($acc1,$mul1); # np[j]*m1
&paddq ($car0,$acc0); # +=c0
@ -250,11 +267,11 @@ if (0) {
&xor ("eax","eax"); # signal "not fast enough [yet]"
&jmp (&label("just_leave"));
# While the below code provides competitive performance for
# all key lengthes on modern cores, it's still a tad slower
# for >=2048-bits keys on *elder* CPUs:-( "Competitive" means
# compared to the original integer-only assembler. 512-bit
# RSA sign is better by >=30%, but that's about all one can
# say about all CPUs...
# all key lengthes on modern Intel cores, it's still more
# than 10% slower for 4096-bit key elsewhere:-( "Competitive"
# means compared to the original integer-only assembler.
# 512-bit RSA sign is better by ~40%, but that's about all
# one can say about all CPUs...
} else {
$inp="esi"; # integer path uses these registers differently
$word="edi";
@ -496,13 +513,13 @@ $sbit=$num;
&mov ($carry,"edx");
&mul ($word); # ap[j]*ap[i]
&add ("eax",$carry);
&lea ($j,&DWP(1,$j));
&lea ($carry,&DWP(0,"eax","eax"));
&adc ("edx",0);
&lea ($carry,&DWP(0,$sbit,"eax",2));
&shr ("eax",31);
&cmp ($carry,$sbit);
&add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
&lea ($j,&DWP(1,$j));
&adc ("eax",0);
&add ($carry,&DWP($frame-4,"esp",$j,4)); # +=tp[j]
&add ($carry,$sbit);
&adc ("eax",0);
&cmp ($j,$_num);
&mov (&DWP($frame-4,"esp",$j,4),$carry); # tp[j]=