487 lines
10 KiB
Perl
487 lines
10 KiB
Perl
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#!/usr/bin/env perl
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#
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# Copyright Supranational LLC
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# Licensed under the Apache License, Version 2.0, see LICENSE for details.
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# SPDX-License-Identifier: Apache-2.0
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#
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# "Sparse" in subroutine names refers to most significant limb of the
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# modulus. Though "sparse" is a bit of misnomer, because limitation is
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# just not-all-ones. Or in other words not larger than 2^256-2^192-1.
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# In general Montgomery multiplication algorithm can handle one of the
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# inputs being non-reduced and capped by 1<<radix_width, 1<<256 in this
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# case, rather than the modulus. Whether or not mul_mont_sparse_256, a
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# *taylored* implementation of the algorithm, can handle such input can
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# be circumstantial. For example, in most general case it depends on
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# similar "bit sparsity" of individual limbs of the second, fully reduced
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# multiplicand. If you can't make such assumption about the limbs, then
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# non-reduced value shouldn't be larger than "same old" 2^256-2^192-1.
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# This requirement can be met by conditionally subtracting "bitwise
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# left-aligned" modulus. For example, if modulus is 200 bits wide, you
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# would need to conditionally subtract the value of modulus<<56. Common
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# source of non-reduced values is redc_mont_256 treating 512-bit inputs.
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# Well, more specifically ones with upper half not smaller than modulus.
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# Just in case, why limitation at all and not general-purpose 256-bit
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# subroutines? Unlike the 384-bit case, accounting for additional carry
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# has disproportionate impact on performance, especially in adcx/adox
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# implementation.
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$flavour = shift;
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$output = shift;
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if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
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$win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
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( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
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die "can't locate x86_64-xlate.pl";
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open STDOUT,"| \"$^X\" \"$xlate\" $flavour \"$output\""
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or die "can't call $xlate: $!";
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# common argument layout
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($r_ptr,$a_ptr,$b_org,$n_ptr,$n0) = ("%rdi","%rsi","%rdx","%rcx","%r8");
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$b_ptr = "%rbx";
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{ ############################################################## 255 bits
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my @acc=map("%r$_",(10..15));
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{ ############################################################## mulq
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my ($lo,$hi)=("%rbp","%r9");
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$code.=<<___;
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.text
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.globl mulx_mont_sparse_256
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.hidden mulx_mont_sparse_256
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.type mulx_mont_sparse_256,\@function,5,"unwind"
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.align 32
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mulx_mont_sparse_256:
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.cfi_startproc
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push %rbp
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.cfi_push %rbp
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push %rbx
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.cfi_push %rbx
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push %r12
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.cfi_push %r12
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push %r13
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.cfi_push %r13
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push %r14
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.cfi_push %r14
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push %r15
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.cfi_push %r15
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sub \$8,%rsp
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.cfi_adjust_cfa_offset 8
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.cfi_end_prologue
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mov $b_org, $b_ptr # evacuate from %rdx
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mov 8*0($b_org), %rdx
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mov 8*0($a_ptr), @acc[4]
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mov 8*1($a_ptr), @acc[5]
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mov 8*2($a_ptr), $lo
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mov 8*3($a_ptr), $hi
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lea -128($a_ptr), $a_ptr # control u-op density
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lea -128($n_ptr), $n_ptr # control u-op density
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mulx @acc[4], %rax, @acc[1] # a[0]*b[0]
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call __mulx_mont_sparse_256
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mov 8(%rsp),%r15
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.cfi_restore %r15
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mov 16(%rsp),%r14
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.cfi_restore %r14
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mov 24(%rsp),%r13
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.cfi_restore %r13
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mov 32(%rsp),%r12
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.cfi_restore %r12
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mov 40(%rsp),%rbx
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.cfi_restore %rbx
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mov 48(%rsp),%rbp
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.cfi_restore %rbp
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lea 56(%rsp),%rsp
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.cfi_adjust_cfa_offset -56
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.cfi_epilogue
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ret
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.cfi_endproc
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.size mulx_mont_sparse_256,.-mulx_mont_sparse_256
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.globl sqrx_mont_sparse_256
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.hidden sqrx_mont_sparse_256
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.type sqrx_mont_sparse_256,\@function,4,"unwind"
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.align 32
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sqrx_mont_sparse_256:
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.cfi_startproc
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push %rbp
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.cfi_push %rbp
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push %rbx
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.cfi_push %rbx
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push %r12
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.cfi_push %r12
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push %r13
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.cfi_push %r13
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push %r14
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.cfi_push %r14
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push %r15
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.cfi_push %r15
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sub \$8,%rsp
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.cfi_adjust_cfa_offset 8
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.cfi_end_prologue
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mov $a_ptr, $b_ptr
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mov $n_ptr, $n0
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mov $b_org, $n_ptr
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mov 8*0($a_ptr), %rdx
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mov 8*1($a_ptr), @acc[5]
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mov 8*2($a_ptr), $lo
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mov 8*3($a_ptr), $hi
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lea -128($b_ptr), $a_ptr # control u-op density
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lea -128($n_ptr), $n_ptr # control u-op density
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mulx %rdx, %rax, @acc[1] # a[0]*a[0]
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call __mulx_mont_sparse_256
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mov 8(%rsp),%r15
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.cfi_restore %r15
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mov 16(%rsp),%r14
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.cfi_restore %r14
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mov 24(%rsp),%r13
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.cfi_restore %r13
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mov 32(%rsp),%r12
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.cfi_restore %r12
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mov 40(%rsp),%rbx
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.cfi_restore %rbx
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mov 48(%rsp),%rbp
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.cfi_restore %rbp
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lea 56(%rsp),%rsp
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.cfi_adjust_cfa_offset -56
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.cfi_epilogue
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ret
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.cfi_endproc
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.size sqrx_mont_sparse_256,.-sqrx_mont_sparse_256
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___
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{
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my @acc=@acc;
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$code.=<<___;
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.type __mulx_mont_sparse_256,\@abi-omnipotent
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.align 32
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__mulx_mont_sparse_256:
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mulx @acc[5], @acc[5], @acc[2]
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mulx $lo, $lo, @acc[3]
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add @acc[5], @acc[1]
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mulx $hi, $hi, @acc[4]
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mov 8($b_ptr), %rdx
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adc $lo, @acc[2]
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adc $hi, @acc[3]
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adc \$0, @acc[4]
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___
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for (my $i=1; $i<4; $i++) {
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my $b_next = $i<3 ? 8*($i+1)."($b_ptr)" : "%rax";
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my $a5 = $i==1 ? @acc[5] : $lo;
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$code.=<<___;
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mov %rax, @acc[0]
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imulq $n0, %rax
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################################# Multiply by b[$i]
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xor $a5, $a5 # [@acc[5]=0,] cf=0, of=0
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mulx 8*0+128($a_ptr), $lo, $hi
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adox $lo, @acc[1]
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adcx $hi, @acc[2]
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mulx 8*1+128($a_ptr), $lo, $hi
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adox $lo, @acc[2]
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adcx $hi, @acc[3]
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mulx 8*2+128($a_ptr), $lo, $hi
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adox $lo, @acc[3]
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adcx $hi, @acc[4]
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mulx 8*3+128($a_ptr), $lo, $hi
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mov %rax, %rdx
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adox $lo, @acc[4]
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adcx @acc[5], $hi # cf=0
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adox $hi, @acc[5] # of=0
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################################# reduction
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mulx 8*0+128($n_ptr), $lo, %rax
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adcx $lo, @acc[0] # guaranteed to be zero
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adox @acc[1], %rax
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mulx 8*1+128($n_ptr), $lo, $hi
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adcx $lo, %rax # @acc[1]
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adox $hi, @acc[2]
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mulx 8*2+128($n_ptr), $lo, $hi
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adcx $lo, @acc[2]
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adox $hi, @acc[3]
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mulx 8*3+128($n_ptr), $lo, $hi
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mov $b_next, %rdx
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adcx $lo, @acc[3]
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adox $hi, @acc[4]
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adcx @acc[0], @acc[4]
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adox @acc[0], @acc[5]
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adcx @acc[0], @acc[5]
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adox @acc[0], @acc[0] # acc[5] in next iteration
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adc \$0, @acc[0] # cf=0, of=0
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___
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push(@acc,shift(@acc));
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}
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$code.=<<___;
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imulq $n0, %rdx
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################################# last reduction
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xor $lo, $lo # cf=0, of=0
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mulx 8*0+128($n_ptr), @acc[0], $hi
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adcx %rax, @acc[0] # guaranteed to be zero
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adox $hi, @acc[1]
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mulx 8*1+128($n_ptr), $lo, $hi
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adcx $lo, @acc[1]
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adox $hi, @acc[2]
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mulx 8*2+128($n_ptr), $lo, $hi
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adcx $lo, @acc[2]
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adox $hi, @acc[3]
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mulx 8*3+128($n_ptr), $lo, $hi
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mov @acc[1], %rdx
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lea 128($n_ptr), $n_ptr
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adcx $lo, @acc[3]
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adox $hi, @acc[4]
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mov @acc[2], %rax
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adcx @acc[0], @acc[4]
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adox @acc[0], @acc[5]
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adc \$0, @acc[5]
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#################################
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# Branch-less conditional acc[1:5] - modulus
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mov @acc[3], $lo
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sub 8*0($n_ptr), @acc[1]
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sbb 8*1($n_ptr), @acc[2]
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sbb 8*2($n_ptr), @acc[3]
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mov @acc[4], $hi
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sbb 8*3($n_ptr), @acc[4]
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sbb \$0, @acc[5]
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cmovc %rdx, @acc[1]
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cmovc %rax, @acc[2]
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cmovc $lo, @acc[3]
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mov @acc[1], 8*0($r_ptr)
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cmovc $hi, @acc[4]
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mov @acc[2], 8*1($r_ptr)
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mov @acc[3], 8*2($r_ptr)
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mov @acc[4], 8*3($r_ptr)
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ret
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.size __mulx_mont_sparse_256,.-__mulx_mont_sparse_256
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___
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} }
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{ my ($n_ptr, $n0)=($b_ptr, $n_ptr); # arguments are "shifted"
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$code.=<<___;
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.globl fromx_mont_256
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.hidden fromx_mont_256
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.type fromx_mont_256,\@function,4,"unwind"
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.align 32
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fromx_mont_256:
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.cfi_startproc
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push %rbp
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.cfi_push %rbp
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push %rbx
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.cfi_push %rbx
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push %r12
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.cfi_push %r12
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push %r13
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.cfi_push %r13
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push %r14
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.cfi_push %r14
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push %r15
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.cfi_push %r15
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sub \$8, %rsp
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.cfi_adjust_cfa_offset 8
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.cfi_end_prologue
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mov $b_org, $n_ptr
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call __mulx_by_1_mont_256
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#################################
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# Branch-less conditional acc[0:3] - modulus
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#mov @acc[4], %rax # __mulq_by_1_mont_256 does it
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mov @acc[5], %rdx
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mov @acc[0], @acc[2]
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mov @acc[1], @acc[3]
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sub 8*0($n_ptr), @acc[4]
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sbb 8*1($n_ptr), @acc[5]
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sbb 8*2($n_ptr), @acc[0]
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sbb 8*3($n_ptr), @acc[1]
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cmovnc @acc[4], %rax
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cmovnc @acc[5], %rdx
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cmovnc @acc[0], @acc[2]
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mov %rax, 8*0($r_ptr)
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cmovnc @acc[1], @acc[3]
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mov %rdx, 8*1($r_ptr)
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mov @acc[2], 8*2($r_ptr)
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mov @acc[3], 8*3($r_ptr)
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mov 8(%rsp),%r15
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.cfi_restore %r15
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mov 16(%rsp),%r14
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.cfi_restore %r14
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mov 24(%rsp),%r13
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.cfi_restore %r13
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mov 32(%rsp),%r12
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.cfi_restore %r12
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mov 40(%rsp),%rbx
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.cfi_restore %rbx
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mov 48(%rsp),%rbp
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.cfi_restore %rbp
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lea 56(%rsp),%rsp
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.cfi_adjust_cfa_offset -56
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.cfi_epilogue
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ret
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.cfi_endproc
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.size fromx_mont_256,.-fromx_mont_256
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.globl redcx_mont_256
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.hidden redcx_mont_256
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.type redcx_mont_256,\@function,4,"unwind"
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.align 32
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redcx_mont_256:
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.cfi_startproc
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push %rbp
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.cfi_push %rbp
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push %rbx
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.cfi_push %rbx
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push %r12
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.cfi_push %r12
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push %r13
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.cfi_push %r13
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push %r14
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.cfi_push %r14
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push %r15
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.cfi_push %r15
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sub \$8, %rsp
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.cfi_adjust_cfa_offset 8
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.cfi_end_prologue
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mov $b_org, $n_ptr
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call __mulx_by_1_mont_256
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add 8*4($a_ptr), @acc[4] # accumulate upper half
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adc 8*5($a_ptr), @acc[5]
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mov @acc[4], %rax
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adc 8*6($a_ptr), @acc[0]
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mov @acc[5], %rdx
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adc 8*7($a_ptr), @acc[1]
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sbb $a_ptr, $a_ptr
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#################################
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# Branch-less conditional acc[0:4] - modulus
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mov @acc[0], @acc[2]
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sub 8*0($n_ptr), @acc[4]
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sbb 8*1($n_ptr), @acc[5]
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sbb 8*2($n_ptr), @acc[0]
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mov @acc[1], @acc[3]
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sbb 8*3($n_ptr), @acc[1]
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sbb \$0, $a_ptr
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cmovnc @acc[4], %rax
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cmovnc @acc[5], %rdx
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cmovnc @acc[0], @acc[2]
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mov %rax, 8*0($r_ptr)
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cmovnc @acc[1], @acc[3]
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mov %rdx, 8*1($r_ptr)
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mov @acc[2], 8*2($r_ptr)
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mov @acc[3], 8*3($r_ptr)
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mov 8(%rsp),%r15
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.cfi_restore %r15
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mov 16(%rsp),%r14
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.cfi_restore %r14
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mov 24(%rsp),%r13
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.cfi_restore %r13
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mov 32(%rsp),%r12
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.cfi_restore %r12
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mov 40(%rsp),%rbx
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.cfi_restore %rbx
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mov 48(%rsp),%rbp
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.cfi_restore %rbp
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lea 56(%rsp),%rsp
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.cfi_adjust_cfa_offset -56
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.cfi_epilogue
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ret
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.cfi_endproc
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.size redcx_mont_256,.-redcx_mont_256
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___
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{
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my @acc=@acc;
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$code.=<<___;
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.type __mulx_by_1_mont_256,\@abi-omnipotent
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.align 32
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__mulx_by_1_mont_256:
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mov 8*0($a_ptr), %rax
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mov 8*1($a_ptr), @acc[1]
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mov 8*2($a_ptr), @acc[2]
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mov 8*3($a_ptr), @acc[3]
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mov %rax, @acc[4]
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imulq $n0, %rax
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mov %rax, @acc[0]
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___
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for (my $i=0; $i<4; $i++) {
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my $hi = @acc[4];
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$code.=<<___;
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################################# reduction $i
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mulq 8*0($n_ptr)
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add %rax, @acc[4] # guaranteed to be zero
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mov @acc[0], %rax
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adc %rdx, @acc[4]
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mulq 8*1($n_ptr)
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add %rax, @acc[1]
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mov @acc[0], %rax
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adc \$0, %rdx
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add @acc[4], @acc[1]
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adc \$0, %rdx
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mov %rdx, $hi
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mulq 8*2($n_ptr)
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___
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$code.=<<___ if ($i<3);
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mov @acc[1], @acc[5]
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imulq $n0, @acc[1]
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___
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$code.=<<___;
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add %rax, @acc[2]
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mov @acc[0], %rax
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adc \$0, %rdx
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add $hi, @acc[2]
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adc \$0, %rdx
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mov %rdx, $hi
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mulq 8*3($n_ptr)
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add %rax, @acc[3]
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mov @acc[1], %rax
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adc \$0, %rdx
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add $hi, @acc[3]
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adc \$0, %rdx
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mov %rdx, @acc[4]
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___
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push(@acc,shift(@acc));
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}
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$code.=<<___;
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ret
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.size __mulx_by_1_mont_256,.-__mulx_by_1_mont_256
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___
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} } }
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print $code;
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close STDOUT;
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