SSE2 SHA512_Transform implementation. No, it's not used anywhere yet and

is subject to change as C implementation is added...

crypto/sha/asm/sha512-sse2.pl

+#!/usr/bin/env perl
+#
+# SHA512_Transform_SSE2.
+#
+# As the name suggests, this is an IA-32 SSE2 implementation of
+# SHA512_Transform. Motivating factor for the undertaken effort was that
+# SHA512 was observed to *consistently* perform *significantly* poorer
+# than SHA256 [2x and slower is common] on 32-bit platforms. On 64-bit
+# platforms on the other hand SHA512 tend to outperform SHA256 [~50%
+# seem to be common improvement factor]. All this is perfectly natural,
+# as SHA512 is a 64-bit algorithm. But isn't IA-32 SSE2 essentially
+# a 64-bit instruction set? Is it rich enough to implement SHA512?
+# If answer was "no," then you wouldn't have been reading this...
+#
+# [Preliminary] throughput numbers (larger is better):
+#
+#		2.4GHz P4	1.4GHz AMD32	1.4GHz AMD64
+# SHA256/gcc	38		36		46
+# SHA512/gcc	9		15		72
+# SHA512/sse2	53(*)		51
+# SHA512/icc	21		21
+# SHA256/icc	52		42
+#
+#  (*)	I.e. it gives ~6x speed-up on P4 if compared to code generated
+#	by gcc, and 2.5x over icc. It was worth it:-) Well, one can
+#	argue that handcoded *non*-SSE2 implementation would perform
+#	better than compiler generated one, and comparison therefore
+#	is not exactly fair. As SHA512 puts enormous pressure on IA-32
+#	GP register bank, I reckon handcoded version wouldn't perform
+#	significantly better than one compiled with icc, ~20% perhaps.
+#	So that this code would still outperform it with distinguishing
+#	marginal. But feel free to prove me wrong:-)
+#
+#						<appro@fy.chalmers.se>
+push(@INC,"perlasm","../../perlasm");
+require "x86asm.pl";
+
+&asm_init($ARGV[0],"sha512-sse2.pl",$ARGV[$#ARGV] eq "386");
+
+$K512="esi";	# K512[80] table, found at the end...
+#$W512="esp";	# $W512 is not just W512[16]: it comprises *two* copies
+		# of W512[16] and a copy of A-H variables...
+$W512_SZ=8*(16+16+8);	# see above...
+#$Kidx="ebx";	# index in K512 table, advances from 0 to 80...
+$Widx="edx";	# index in W512, wraps around at 16...
+$data="edi";	# 16 qwords of input data...
+$A="mm0";	# B-D and
+$E="mm1";	# F-H are allocated dynamically...
+$Aoff=256+0;	# A-H offsets relative to $W512...
+$Boff=256+8;
+$Coff=256+16;
+$Doff=256+24;
+$Eoff=256+32;
+$Foff=256+40;
+$Goff=256+48;
+$Hoff=256+56;
+
+sub SHA2_ROUND()
+{ local ($kidx,$widx)=@_;
+
+	# One can argue that one could reorder instructions for better
+	# performance. Well, I tried and it doesn't seem to make any
+	# noticeable difference. Modern out-of-order execution cores
+	# reorder instructions to their liking in either case and they
+	# apparently do decent job. So we can keep the code more
+	# readable/regular/comprehensible:-)
+
+	# I adhere to 64-bit %mmX registers in order to avoid/not care
+	# about #GP exceptions on misaligned 128-bit access, most
+	# notably in paddq with memory operand.
+
+	&movq	("mm4",&QWP($Foff,$W512));	# load f
+	&movq	("mm5",&QWP($Goff,$W512));	# load g
+	&movq	("mm6",&QWP($Hoff,$W512));	# load h
+	&movq	(&QWP($Foff,$W512),$E);		# f = e
+	&movq	(&QWP($Goff,$W512),"mm4");	# g = f
+	&movq	(&QWP($Hoff,$W512),"mm5");	# h = g
+
+	&movq	("mm2",$E);			# %mm2 is sliding right
+	&movq	("mm3",$E);			# %mm3 is sliding left
+	&psrlq	("mm2",14);
+	&psllq	("mm3",23);
+	&movq	("mm7","mm2");			# %mm7 is T1
+	&pxor	("mm7","mm3");
+	&psrlq	("mm2",4);
+	&psllq	("mm3",23);
+	&pxor	("mm7","mm2");
+	&pxor	("mm7","mm3");
+	&psrlq	("mm2",23);
+	&psllq	("mm3",4);
+	&pxor	("mm7","mm2");
+	&pxor	("mm7","mm3");			# T1=Sigma1_512(e)
+
+	&pxor	("mm4","mm5");			# f^=g
+	&pand	("mm4",$E);			# f&=e
+	&pxor	("mm4","mm5");			# f^=g
+	&paddq	("mm7","mm4");			# T1+=Ch(e,f,g)
+
+	&movq	("mm2",&QWP($Boff,$W512));	# load b
+	&movq	("mm3",&QWP($Coff,$W512));	# load c
+	&movq	($E,&QWP($Doff,$W512));		# e = d
+	&movq	(&QWP($Boff,$W512),$A);		# b = a
+	&movq	(&QWP($Coff,$W512),"mm2");	# c = b
+	&movq	(&QWP($Doff,$W512),"mm3");	# d = c
+
+	&paddq	("mm7","mm6");			# T1+=h
+	&paddq	("mm7",&QWP(0,$K512,$kidx,8));	# T1+=K512[i]
+	&paddq	("mm7",&QWP(0,$W512,$widx,8));	# T1+=W512[i]
+	&paddq	($E,"mm7");			# e += T1
+
+	&movq	("mm4",$A);			# %mm4 is sliding right
+	&movq	("mm5",$A);			# %mm5 is sliding left
+	&psrlq	("mm4",28);
+	&psllq	("mm5",25);
+	&movq	("mm6","mm4");			# %mm6 is T2
+	&pxor	("mm6","mm5");
+	&psrlq	("mm4",6);
+	&psllq	("mm5",5);
+	&pxor	("mm6","mm4");
+	&pxor	("mm6","mm5");
+	&psrlq	("mm4",5);
+	&psllq	("mm5",6);
+	&pxor	("mm6","mm4");
+	&pxor	("mm6","mm5");			# T2=Sigma0_512(a)
+
+	&movq	("mm4","mm2");			# %mm4=b
+	&pand	("mm2",$A);			# b&=a
+	&pand	("mm4","mm3");			# %mm4&=c
+	&pand	("mm3",$A);			# c&=a
+	&pxor	("mm4","mm2");			# %mm4^=b&a
+	&pxor	("mm4","mm3");			# %mm4^=c&a
+	&paddq	("mm6","mm4");			# T2+=Maj(a,b,c)
+
+	&movq	($A,"mm7");			# a=T1
+	&paddq	($A,"mm6");			# a+=T2
+}
+
+$func="SHA512_Transform_SSE2";
+
+&function_begin_B($func);
+	if (0) {# Caller is expected to check if it's appropriate to
+		# call this routine. Below 3 lines are retained for
+		# debugging purposes...
+		&picmeup("eax","OPENSSL_ia32cap");
+		&bt	(&DWP(0,"eax"),26);
+		&jnc	("SHA512_Transform");
+	}
+
+	&push	("ebp");
+	&mov	("ebp","esp");
+	&push	("ebx");
+	&push	("esi");
+	&push	("edi");
+
+	&mov	($Widx,&DWP(8,"ebp"));		# A-H state, 1st arg
+	&mov	($data,&DWP(12,"ebp"));		# input data, 2nd arg
+	&call	(&label("pic_point"));		# make it PIC!
+&set_label("pic_point");
+	&blindpop($K512);
+	&lea	($K512,&DWP(&label("K512")."-".&label("pic_point"),$K512));
+
+	$W512 = "esp";			# start using %esp as W512
+	&sub	($W512,$W512_SZ);
+	&and	($W512,-16);		# ensure 128-bit alignment
+
+	# make private copy of A-H
+	#     v assume the worst and stick to unaligned load
+	&movdqu	("xmm0",&QWP(0,$Widx));
+	&movdqu	("xmm1",&QWP(16,$Widx));
+	&movdqu	("xmm2",&QWP(32,$Widx));
+	&movdqu	("xmm3",&QWP(48,$Widx));
+	&movdqa	(&QWP($Aoff,$W512),"xmm0");	# a,b
+	&movdqa	(&QWP($Coff,$W512),"xmm1");	# c,d
+	&movdqa	(&QWP($Eoff,$W512),"xmm2");	# e,f
+	&movdqa	(&QWP($Goff,$W512),"xmm3");	# g,h
+
+	&xor	($Widx,$Widx);
+
+	&movdq2q($A,"xmm0");			# load a
+	&movdq2q($E,"xmm2");			# load e
+
+	# Why aren't loops unrolled? It makes sense to unroll if
+	# execution time for loop body is comparable with branch
+	# penalties and/or if whole data-set resides in register
+	# bank. Neither is case here...
+
+&align(8);
+&set_label("_1st_loop");		# 0-15
+	# flip input stream byte order...
+	&mov	("eax",&DWP(0,$data,$Widx,8));
+	&mov	("ebx",&DWP(4,$data,$Widx,8));
+	&bswap	("eax");
+	&bswap	("ebx");
+	&mov	(&DWP(0,$W512,$Widx,8),"ebx");		# W512[i]
+	&mov	(&DWP(4,$W512,$Widx,8),"eax");
+	&mov	(&DWP(128+0,$W512,$Widx,8),"ebx");	# copy of W512[i]
+	&mov	(&DWP(128+4,$W512,$Widx,8),"eax");
+
+	&SHA2_ROUND($Widx,$Widx); &inc($Widx);
+
+&cmp	($Widx,16)
+&jl	(&label("_1st_loop"));
+
+	$Kidx = "ebx";			# start using %ebx as Kidx
+	&mov	($Kidx,$Widx);
+
+&align(8);
+&set_label("_2nd_loop");		# 16-79
+	&and($Widx,0xf);
+
+	# 128-bit fragment! I update W512[i] and W512[i+1] in
+	# parallel:-) Note that I refer to W512[(i&0xf)+N] and not to
+	# W512[(i+N)&0xf]! This is exactly what I maintain the second
+	# copy of W512[16] for...
+	&movdqu	("xmm0",&QWP(8*1,$W512,$Widx,8));	# s0=W512[i+1]
+	&movdqa	("xmm2","xmm0");		# %xmm2 is sliding right
+	&movdqa	("xmm3","xmm0");		# %xmm3 is sliding left
+	&psrlq	("xmm2",1);
+	&psllq	("xmm3",56);
+	&movdqa	("xmm0","xmm2");
+	&pxor	("xmm0","xmm3");
+	&psrlq	("xmm2",6);
+	&psllq	("xmm3",7);
+	&pxor	("xmm0","xmm2");
+	&pxor	("xmm0","xmm3");
+	&psrlq	("xmm2",1);
+	&pxor	("xmm0","xmm2");		# s0 = sigma0_512(s0);
+
+	&movdqa	("xmm1",&QWP(8*14,$W512,$Widx,8));	# s1=W512[i+14]
+	&movdqa	("xmm4","xmm1");		# %xmm4 is sliding right
+	&movdqa	("xmm5","xmm1");		# %xmm5 is sliding left
+	&psrlq	("xmm4",6);
+	&psllq	("xmm5",3);
+	&movdqa	("xmm1","xmm4");
+	&pxor	("xmm1","xmm5");
+	&psrlq	("xmm4",13);
+	&psllq	("xmm5",42);
+	&pxor	("xmm1","xmm4");
+	&pxor	("xmm1","xmm5");
+	&psrlq	("xmm4",42);
+	&pxor	("xmm1","xmm4");		# s1 = sigma1_512(s1);
+
+	#     + have to explictly load W512[i+9] as it's not 128-bit
+	#     v	aligned and paddq would throw an exception...
+	&movdqu	("xmm6",&QWP(8*9,$W512,$Widx,8));
+	&paddq	("xmm0","xmm1");		# s0 += s1
+	&paddq	("xmm0","xmm6");		# s0 += W512[i+9]
+	&paddq	("xmm0",&QWP(0,$W512,$Widx,8));	# s0 += W512[i]
+
+	&movdqa	(&QWP(0,$W512,$Widx,8),"xmm0");		# W512[i] = s0
+	&movdqa	(&QWP(16*8,$W512,$Widx,8),"xmm0");	# copy of W512[i]
+
+	# as the above fragment was 128-bit, we "owe" 2 rounds...
+	&SHA2_ROUND($Kidx,$Widx); &inc($Kidx); &inc($Widx);
+	&SHA2_ROUND($Kidx,$Widx); &inc($Kidx); &inc($Widx);
+
+&cmp	($Kidx,80);
+&jl	(&label("_2nd_loop"));
+
+	# update A-H state
+	&mov	($Widx,&DWP(8,"ebp"));		# A-H state, 1st arg
+	&movq	(&QWP($Aoff,$W512),$A);		# write out a
+	&movq	(&QWP($Eoff,$W512),$E);		# write out e
+	&movdqu	("xmm0",&QWP(0,$Widx));
+	&movdqu	("xmm1",&QWP(16,$Widx));
+	&movdqu	("xmm2",&QWP(32,$Widx));
+	&movdqu	("xmm3",&QWP(48,$Widx));
+	&paddq	("xmm0",&QWP($Aoff,$W512));	# 128-bit additions...
+	&paddq	("xmm1",&QWP($Coff,$W512));
+	&paddq	("xmm2",&QWP($Eoff,$W512));
+	&paddq	("xmm3",&QWP($Goff,$W512));
+	&movdqu	(&QWP(0,$Widx),"xmm0");
+	&movdqu	(&QWP(16,$Widx),"xmm1");
+	&movdqu	(&QWP(32,$Widx),"xmm2");
+	&movdqu	(&QWP(48,$Widx),"xmm3");
+
+	# epilogue
+	&emms	();	# required for at least ELF and Win32 ABIs
+	&mov	("edi",&DWP(-12,"ebp"));
+	&mov	("esi",&DWP(-8,"ebp"));
+	&mov	("ebx",&DWP(-4,"ebp"));
+	&leave	();
+&ret	();
+
+&align(16);
+&set_label("K512");	# Yes! I keep it in the code segment!
+	&data_word(0xd728ae22,0x428a2f98);	# u64
+	&data_word(0x23ef65cd,0x71374491);	# u64
+	&data_word(0xec4d3b2f,0xb5c0fbcf);	# u64
+	&data_word(0x8189dbbc,0xe9b5dba5);	# u64
+	&data_word(0xf348b538,0x3956c25b);	# u64
+	&data_word(0xb605d019,0x59f111f1);	# u64
+	&data_word(0xaf194f9b,0x923f82a4);	# u64
+	&data_word(0xda6d8118,0xab1c5ed5);	# u64
+	&data_word(0xa3030242,0xd807aa98);	# u64
+	&data_word(0x45706fbe,0x12835b01);	# u64
+	&data_word(0x4ee4b28c,0x243185be);	# u64
+	&data_word(0xd5ffb4e2,0x550c7dc3);	# u64
+	&data_word(0xf27b896f,0x72be5d74);	# u64
+	&data_word(0x3b1696b1,0x80deb1fe);	# u64
+	&data_word(0x25c71235,0x9bdc06a7);	# u64
+	&data_word(0xcf692694,0xc19bf174);	# u64
+	&data_word(0x9ef14ad2,0xe49b69c1);	# u64
+	&data_word(0x384f25e3,0xefbe4786);	# u64
+	&data_word(0x8b8cd5b5,0x0fc19dc6);	# u64
+	&data_word(0x77ac9c65,0x240ca1cc);	# u64
+	&data_word(0x592b0275,0x2de92c6f);	# u64
+	&data_word(0x6ea6e483,0x4a7484aa);	# u64
+	&data_word(0xbd41fbd4,0x5cb0a9dc);	# u64
+	&data_word(0x831153b5,0x76f988da);	# u64
+	&data_word(0xee66dfab,0x983e5152);	# u64
+	&data_word(0x2db43210,0xa831c66d);	# u64
+	&data_word(0x98fb213f,0xb00327c8);	# u64
+	&data_word(0xbeef0ee4,0xbf597fc7);	# u64
+	&data_word(0x3da88fc2,0xc6e00bf3);	# u64
+	&data_word(0x930aa725,0xd5a79147);	# u64
+	&data_word(0xe003826f,0x06ca6351);	# u64
+	&data_word(0x0a0e6e70,0x14292967);	# u64
+	&data_word(0x46d22ffc,0x27b70a85);	# u64
+	&data_word(0x5c26c926,0x2e1b2138);	# u64
+	&data_word(0x5ac42aed,0x4d2c6dfc);	# u64
+	&data_word(0x9d95b3df,0x53380d13);	# u64
+	&data_word(0x8baf63de,0x650a7354);	# u64
+	&data_word(0x3c77b2a8,0x766a0abb);	# u64
+	&data_word(0x47edaee6,0x81c2c92e);	# u64
+	&data_word(0x1482353b,0x92722c85);	# u64
+	&data_word(0x4cf10364,0xa2bfe8a1);	# u64
+	&data_word(0xbc423001,0xa81a664b);	# u64
+	&data_word(0xd0f89791,0xc24b8b70);	# u64
+	&data_word(0x0654be30,0xc76c51a3);	# u64
+	&data_word(0xd6ef5218,0xd192e819);	# u64
+	&data_word(0x5565a910,0xd6990624);	# u64
+	&data_word(0x5771202a,0xf40e3585);	# u64
+	&data_word(0x32bbd1b8,0x106aa070);	# u64
+	&data_word(0xb8d2d0c8,0x19a4c116);	# u64
+	&data_word(0x5141ab53,0x1e376c08);	# u64
+	&data_word(0xdf8eeb99,0x2748774c);	# u64
+	&data_word(0xe19b48a8,0x34b0bcb5);	# u64
+	&data_word(0xc5c95a63,0x391c0cb3);	# u64
+	&data_word(0xe3418acb,0x4ed8aa4a);	# u64
+	&data_word(0x7763e373,0x5b9cca4f);	# u64
+	&data_word(0xd6b2b8a3,0x682e6ff3);	# u64
+	&data_word(0x5defb2fc,0x748f82ee);	# u64
+	&data_word(0x43172f60,0x78a5636f);	# u64
+	&data_word(0xa1f0ab72,0x84c87814);	# u64
+	&data_word(0x1a6439ec,0x8cc70208);	# u64
+	&data_word(0x23631e28,0x90befffa);	# u64
+	&data_word(0xde82bde9,0xa4506ceb);	# u64
+	&data_word(0xb2c67915,0xbef9a3f7);	# u64
+	&data_word(0xe372532b,0xc67178f2);	# u64
+	&data_word(0xea26619c,0xca273ece);	# u64
+	&data_word(0x21c0c207,0xd186b8c7);	# u64
+	&data_word(0xcde0eb1e,0xeada7dd6);	# u64
+	&data_word(0xee6ed178,0xf57d4f7f);	# u64
+	&data_word(0x72176fba,0x06f067aa);	# u64
+	&data_word(0xa2c898a6,0x0a637dc5);	# u64
+	&data_word(0xbef90dae,0x113f9804);	# u64
+	&data_word(0x131c471b,0x1b710b35);	# u64
+	&data_word(0x23047d84,0x28db77f5);	# u64
+	&data_word(0x40c72493,0x32caab7b);	# u64
+	&data_word(0x15c9bebc,0x3c9ebe0a);	# u64
+	&data_word(0x9c100d4c,0x431d67c4);	# u64
+	&data_word(0xcb3e42b6,0x4cc5d4be);	# u64
+	&data_word(0xfc657e2a,0x597f299c);	# u64
+	&data_word(0x3ad6faec,0x5fcb6fab);	# u64
+	&data_word(0x4a475817,0x6c44198c);	# u64
+
+&function_end_B($func);
+
+&asm_finish();