sha1-ppc.pl: shave off one cycle from BODY_20_39
and improve performance by 10% on POWER[78]. Reviewed-by: Kurt Roeckx <kurt@openssl.org>
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@ -125,31 +125,31 @@ my ($i,$a,$b,$c,$d,$e,$f)=@_;
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my $j=$i+1;
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$code.=<<___ if ($i<79);
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add $f,$K,$e
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xor $t0,$b,$d
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rotlwi $e,$a,5
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xor @X[$j%16],@X[$j%16],@X[($j+2)%16]
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add $f,$f,@X[$i%16]
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xor $t0,$b,$c
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xor $t0,$t0,$c
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xor @X[$j%16],@X[$j%16],@X[($j+8)%16]
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add $f,$f,$e
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rotlwi $b,$b,30
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xor $t0,$t0,$d
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xor @X[$j%16],@X[$j%16],@X[($j+13)%16]
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add $f,$f,$t0
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rotlwi $b,$b,30
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xor @X[$j%16],@X[$j%16],@X[($j+13)%16]
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add $f,$f,$e
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rotlwi @X[$j%16],@X[$j%16],1
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___
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$code.=<<___ if ($i==79);
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add $f,$K,$e
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xor $t0,$b,$d
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rotlwi $e,$a,5
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lwz r16,0($ctx)
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add $f,$f,@X[$i%16]
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xor $t0,$b,$c
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xor $t0,$t0,$c
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lwz r17,4($ctx)
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add $f,$f,$e
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add $f,$f,$t0
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rotlwi $b,$b,30
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lwz r18,8($ctx)
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xor $t0,$t0,$d
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lwz r19,12($ctx)
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add $f,$f,$t0
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add $f,$f,$e
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lwz r20,16($ctx)
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___
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}
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@ -13,8 +13,8 @@
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# always virtualized setup with possibly throttled processor.
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# Relative comparison is therefore more informative. This module is
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# ~60% faster than integer-only sha512-ppc.pl. To anchor to something
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# else, SHA256 is 16% slower than sha1-ppc.pl and 2.5x slower than
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# hardware-assisted aes-128-cbc encrypt. SHA512 is 33% faster than
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# else, SHA256 is 24% slower than sha1-ppc.pl and 2.5x slower than
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# hardware-assisted aes-128-cbc encrypt. SHA512 is 20% faster than
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# sha1-ppc.pl and 1.6x slower than aes-128-cbc. Another interesting
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# result is degree of computational resources' utilization. POWER8 is
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# "massively multi-threaded chip" and difference between single- and
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