Add ec/asm/x25519-ppc64.pl module.

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6782)

crypto/ec/asm/x25519-ppc64.pl

+#! /usr/bin/env perl
+# Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+#
+# ====================================================================
+# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
+# project. The module is, however, dual licensed under OpenSSL and
+# CRYPTOGAMS licenses depending on where you obtain it. For further
+# details see http://www.openssl.org/~appro/cryptogams/.
+# ====================================================================
+#
+# X25519 lower-level primitives for PPC64.
+#
+# July 2018.
+#
+# Base 2^64 is faster than base 2^51 on pre-POWER8, most notably ~15%
+# faster on PPC970/G5. POWER8 on the other hand seems to trip on own
+# shoelaces when handling longer carry chains. As base 2^51 has just
+# single-carry pairs, it's 25% faster than base 2^64. Since PPC970 is
+# pretty old, base 2^64 implementation is not engaged. Comparison to
+# compiler-generated code is complicated by the fact that not all
+# compilers support 128-bit integers. When compiler doesn't, like xlc,
+# this module delivers more than 2x improvement, and when it does,
+# from 12% to 30% improvement was measured...
+
+$flavour = shift;
+while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {}
+
+$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
+( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
+( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
+die "can't locate ppc-xlate.pl";
+
+open OUT,"| \"$^X\" $xlate $flavour $output";
+*STDOUT=*OUT;
+
+my $sp = "r1";
+my ($rp,$ap,$bp) = map("r$_",3..5);
+
+####################################################### base 2^64
+if (0) {
+my ($bi,$a0,$a1,$a2,$a3,$t0,$t1, $t2,$t3,
+    $acc0,$acc1,$acc2,$acc3,$acc4,$acc5,$acc6,$acc7) =
+    map("r$_",(6..12,22..31));
+my $zero = "r0";
+my $FRAME = 16*8;
+
+$code.=<<___;
+.text
+
+.globl	x25519_fe64_mul
+.type	x25519_fe64_mul,\@function
+.align	5
+x25519_fe64_mul:
+	stdu	$sp,-$FRAME($sp)
+	std	r22,`$FRAME-8*10`($sp)
+	std	r23,`$FRAME-8*9`($sp)
+	std	r24,`$FRAME-8*8`($sp)
+	std	r25,`$FRAME-8*7`($sp)
+	std	r26,`$FRAME-8*6`($sp)
+	std	r27,`$FRAME-8*5`($sp)
+	std	r28,`$FRAME-8*4`($sp)
+	std	r29,`$FRAME-8*3`($sp)
+	std	r30,`$FRAME-8*2`($sp)
+	std	r31,`$FRAME-8*1`($sp)
+
+	ld	$bi,0($bp)
+	ld	$a0,0($ap)
+	xor	$zero,$zero,$zero
+	ld	$a1,8($ap)
+	ld	$a2,16($ap)
+	ld	$a3,24($ap)
+
+	mulld	$acc0,$a0,$bi		# a[0]*b[0]
+	mulhdu	$t0,$a0,$bi
+	mulld	$acc1,$a1,$bi		# a[1]*b[0]
+	mulhdu	$t1,$a1,$bi
+	mulld	$acc2,$a2,$bi		# a[2]*b[0]
+	mulhdu	$t2,$a2,$bi
+	mulld	$acc3,$a3,$bi		# a[3]*b[0]
+	mulhdu	$t3,$a3,$bi
+___
+for(my @acc=($acc0,$acc1,$acc2,$acc3,$acc4,$acc5,$acc6,$acc7),
+    my $i=1; $i<4; shift(@acc), $i++) {
+my $acc4 = $i==1? $zero : @acc[4];
+
+$code.=<<___;
+	ld	$bi,`8*$i`($bp)
+	addc	@acc[1],@acc[1],$t0	# accumulate high parts
+	mulld	$t0,$a0,$bi
+	adde	@acc[2],@acc[2],$t1
+	mulld	$t1,$a1,$bi
+	adde	@acc[3],@acc[3],$t2
+	mulld	$t2,$a2,$bi
+	adde	@acc[4],$acc4,$t3
+	mulld	$t3,$a3,$bi
+	addc	@acc[1],@acc[1],$t0	# accumulate low parts
+	mulhdu	$t0,$a0,$bi
+	adde	@acc[2],@acc[2],$t1
+	mulhdu	$t1,$a1,$bi
+	adde	@acc[3],@acc[3],$t2
+	mulhdu	$t2,$a2,$bi
+	adde	@acc[4],@acc[4],$t3
+	mulhdu	$t3,$a3,$bi
+	adde	@acc[5],$zero,$zero
+___
+}
+$code.=<<___;
+	li	$bi,38
+	addc	$acc4,$acc4,$t0
+	mulld	$t0,$acc4,$bi
+	adde	$acc5,$acc5,$t1
+	mulld	$t1,$acc5,$bi
+	adde	$acc6,$acc6,$t2
+	mulld	$t2,$acc6,$bi
+	adde	$acc7,$acc7,$t3
+	mulld	$t3,$acc7,$bi
+
+	addc	$acc0,$acc0,$t0
+	mulhdu	$t0,$acc4,$bi
+	adde	$acc1,$acc1,$t1
+	mulhdu	$t1,$acc5,$bi
+	adde	$acc2,$acc2,$t2
+	mulhdu	$t2,$acc6,$bi
+	adde	$acc3,$acc3,$t3
+	mulhdu	$t3,$acc7,$bi
+	adde	$acc4,$zero,$zero
+
+	addc	$acc1,$acc1,$t0
+	adde	$acc2,$acc2,$t1
+	adde	$acc3,$acc3,$t2
+	adde	$acc4,$acc4,$t3
+
+	mulld	$acc4,$acc4,$bi
+
+	addc	$acc0,$acc0,$acc4
+	addze	$acc1,$acc1
+	addze	$acc2,$acc2
+	addze	$acc3,$acc3
+
+	subfe	$acc4,$acc4,$acc4	# carry -> ~mask
+	std	$acc1,8($rp)
+	andc	$acc4,$bi,$acc4
+	std	$acc2,16($rp)
+	add	$acc0,$acc0,$acc4
+	std	$acc3,24($rp)
+	std	$acc0,0($rp)
+
+	ld	r22,`$FRAME-8*10`($sp)
+	ld	r23,`$FRAME-8*9`($sp)
+	ld	r24,`$FRAME-8*8`($sp)
+	ld	r25,`$FRAME-8*7`($sp)
+	ld	r26,`$FRAME-8*6`($sp)
+	ld	r27,`$FRAME-8*5`($sp)
+	ld	r28,`$FRAME-8*4`($sp)
+	ld	r29,`$FRAME-8*3`($sp)
+	ld	r30,`$FRAME-8*2`($sp)
+	ld	r31,`$FRAME-8*1`($sp)
+	addi	$sp,$sp,$FRAME
+	blr
+	.long	0
+	.byte	0,12,4,0,0x80,10,3,0
+	.long	0
+.size	x25519_fe64_mul,.-x25519_fe64_mul
+
+.globl	x25519_fe64_sqr
+.type	x25519_fe64_sqr,\@function
+.align	5
+x25519_fe64_sqr:
+	stdu	$sp,-$FRAME($sp)
+	std	r22,`$FRAME-8*10`($sp)
+	std	r23,`$FRAME-8*9`($sp)
+	std	r24,`$FRAME-8*8`($sp)
+	std	r25,`$FRAME-8*7`($sp)
+	std	r26,`$FRAME-8*6`($sp)
+	std	r27,`$FRAME-8*5`($sp)
+	std	r28,`$FRAME-8*4`($sp)
+	std	r29,`$FRAME-8*3`($sp)
+	std	r30,`$FRAME-8*2`($sp)
+	std	r31,`$FRAME-8*1`($sp)
+
+	ld	$a0,0($ap)
+	xor	$zero,$zero,$zero
+	ld	$a1,8($ap)
+	ld	$a2,16($ap)
+	ld	$a3,24($ap)
+
+	################################
+	#  |  |  |  |  |  |a1*a0|  |
+	#  |  |  |  |  |a2*a0|  |  |
+	#  |  |a3*a2|a3*a0|  |  |  |
+	#  |  |  |  |a2*a1|  |  |  |
+	#  |  |  |a3*a1|  |  |  |  |
+	# *|  |  |  |  |  |  |  | 2|
+	# +|a3*a3|a2*a2|a1*a1|a0*a0|
+	#  |--+--+--+--+--+--+--+--|
+	#  |A7|A6|A5|A4|A3|A2|A1|A0|, where Ax is $accx, i.e. follow $accx
+	#
+	#  "can't overflow" below mark carrying into high part of
+	#  multiplication result, which can't overflow, because it
+	#  can never be all ones.
+
+	mulld	$acc1,$a1,$a0		# a[1]*a[0]
+	mulhdu	$t1,$a1,$a0
+	mulld	$acc2,$a2,$a0		# a[2]*a[0]
+	mulhdu	$t2,$a2,$a0
+	mulld	$acc3,$a3,$a0		# a[3]*a[0]
+	mulhdu	$acc4,$a3,$a0
+
+	addc	$acc2,$acc2,$t1		# accumulate high parts of multiplication
+	 mulld	$t0,$a2,$a1		# a[2]*a[1]
+	 mulhdu	$t1,$a2,$a1
+	adde	$acc3,$acc3,$t2
+	 mulld	$t2,$a3,$a1		# a[3]*a[1]
+	 mulhdu	$t3,$a3,$a1
+	addze	$acc4,$acc4		# can't overflow
+
+	mulld	$acc5,$a3,$a2		# a[3]*a[2]
+	mulhdu	$acc6,$a3,$a2
+
+	addc	$t1,$t1,$t2		# accumulate high parts of multiplication
+	 mulld	$acc0,$a0,$a0		# a[0]*a[0]
+	addze	$t2,$t3			# can't overflow
+
+	addc	$acc3,$acc3,$t0		# accumulate low parts of multiplication
+	 mulhdu	$a0,$a0,$a0
+	adde	$acc4,$acc4,$t1
+	 mulld	$t1,$a1,$a1		# a[1]*a[1]
+	adde	$acc5,$acc5,$t2
+	 mulhdu	$a1,$a1,$a1
+	addze	$acc6,$acc6		# can't overflow
+
+	addc	$acc1,$acc1,$acc1	# acc[1-6]*=2
+	 mulld	$t2,$a2,$a2		# a[2]*a[2]
+	adde	$acc2,$acc2,$acc2
+	 mulhdu	$a2,$a2,$a2
+	adde	$acc3,$acc3,$acc3
+	 mulld	$t3,$a3,$a3		# a[3]*a[3]
+	adde	$acc4,$acc4,$acc4
+	 mulhdu	$a3,$a3,$a3
+	adde	$acc5,$acc5,$acc5
+	adde	$acc6,$acc6,$acc6
+	addze	$acc7,$zero
+
+	addc	$acc1,$acc1,$a0		# +a[i]*a[i]
+	 li	$bi,38
+	adde	$acc2,$acc2,$t1
+	adde	$acc3,$acc3,$a1
+	adde	$acc4,$acc4,$t2
+	adde	$acc5,$acc5,$a2
+	adde	$acc6,$acc6,$t3
+	adde	$acc7,$acc7,$a3
+
+	mulld	$t0,$acc4,$bi
+	mulld	$t1,$acc5,$bi
+	mulld	$t2,$acc6,$bi
+	mulld	$t3,$acc7,$bi
+
+	addc	$acc0,$acc0,$t0
+	mulhdu	$t0,$acc4,$bi
+	adde	$acc1,$acc1,$t1
+	mulhdu	$t1,$acc5,$bi
+	adde	$acc2,$acc2,$t2
+	mulhdu	$t2,$acc6,$bi
+	adde	$acc3,$acc3,$t3
+	mulhdu	$t3,$acc7,$bi
+	addze	$acc4,$zero
+
+	addc	$acc1,$acc1,$t0
+	adde	$acc2,$acc2,$t1
+	adde	$acc3,$acc3,$t2
+	adde	$acc4,$acc4,$t3
+
+	mulld	$acc4,$acc4,$bi
+
+	addc	$acc0,$acc0,$acc4
+	addze	$acc1,$acc1
+	addze	$acc2,$acc2
+	addze	$acc3,$acc3
+
+	subfe	$acc4,$acc4,$acc4	# carry -> ~mask
+	std	$acc1,8($rp)
+	andc	$acc4,$bi,$acc4
+	std	$acc2,16($rp)
+	add	$acc0,$acc0,$acc4
+	std	$acc3,24($rp)
+	std	$acc0,0($rp)
+
+	ld	r22,`$FRAME-8*10`($sp)
+	ld	r23,`$FRAME-8*9`($sp)
+	ld	r24,`$FRAME-8*8`($sp)
+	ld	r25,`$FRAME-8*7`($sp)
+	ld	r26,`$FRAME-8*6`($sp)
+	ld	r27,`$FRAME-8*5`($sp)
+	ld	r28,`$FRAME-8*4`($sp)
+	ld	r29,`$FRAME-8*3`($sp)
+	ld	r30,`$FRAME-8*2`($sp)
+	ld	r31,`$FRAME-8*1`($sp)
+	addi	$sp,$sp,$FRAME
+	blr
+	.long	0
+	.byte	0,12,4,0,0x80,10,2,0
+	.long	0
+.size	x25519_fe64_sqr,.-x25519_fe64_sqr
+
+.globl	x25519_fe64_mul121666
+.type	x25519_fe64_mul121666,\@function
+.align	5
+x25519_fe64_mul121666:
+	lis	$bi,`65536>>16`
+	ori	$bi,$bi,`121666-65536`
+
+	ld	$t0,0($ap)
+	ld	$t1,8($ap)
+	ld	$bp,16($ap)
+	ld	$ap,24($ap)
+
+	mulld	$a0,$t0,$bi
+	mulhdu	$t0,$t0,$bi
+	mulld	$a1,$t1,$bi
+	mulhdu	$t1,$t1,$bi
+	mulld	$a2,$bp,$bi
+	mulhdu	$bp,$bp,$bi
+	mulld	$a3,$ap,$bi
+	mulhdu	$ap,$ap,$bi
+
+	addc	$a1,$a1,$t0
+	adde	$a2,$a2,$t1
+	adde	$a3,$a3,$bp
+	addze	$ap,    $ap
+
+	mulli	$ap,$ap,38
+
+	addc	$a0,$a0,$ap
+	addze	$a1,$a1
+	addze	$a2,$a2
+	addze	$a3,$a3
+
+	subfe	$t1,$t1,$t1		# carry -> ~mask
+	std	$a1,8($rp)
+	andc	$t0,$t0,$t1
+	std	$a2,16($rp)
+	add	$a0,$a0,$t0
+	std	$a3,24($rp)
+	std	$a0,0($rp)
+
+	blr
+	.long	0
+	.byte	0,12,0x14,0,0,0,2,0
+	.long	0
+.size	x25519_fe64_mul121666,.-x25519_fe64_mul121666
+
+.globl	x25519_fe64_add
+.type	x25519_fe64_add,\@function
+.align	5
+x25519_fe64_add:
+	ld	$a0,0($ap)
+	ld	$t0,0($bp)
+	ld	$a1,8($ap)
+	ld	$t1,8($bp)
+	ld	$a2,16($ap)
+	ld	$bi,16($bp)
+	ld	$a3,24($ap)
+	ld	$bp,24($bp)
+
+	addc	$a0,$a0,$t0
+	adde	$a1,$a1,$t1
+	adde	$a2,$a2,$bi
+	adde	$a3,$a3,$bp
+
+	li	$t0,38
+	subfe	$t1,$t1,$t1		# carry -> ~mask
+	andc	$t1,$t0,$t1
+
+	addc	$a0,$a0,$t1
+	addze	$a1,$a1
+	addze	$a2,$a2
+	addze	$a3,$a3
+
+	subfe	$t1,$t1,$t1		# carry -> ~mask
+	std	$a1,8($rp)
+	andc	$t0,$t0,$t1
+	std	$a2,16($rp)
+	add	$a0,$a0,$t0
+	std	$a3,24($rp)
+	std	$a0,0($rp)
+
+	blr
+	.long	0
+	.byte	0,12,0x14,0,0,0,3,0
+	.long	0
+.size	x25519_fe64_add,.-x25519_fe64_add
+
+.globl	x25519_fe64_sub
+.type	x25519_fe64_sub,\@function
+.align	5
+x25519_fe64_sub:
+	ld	$a0,0($ap)
+	ld	$t0,0($bp)
+	ld	$a1,8($ap)
+	ld	$t1,8($bp)
+	ld	$a2,16($ap)
+	ld	$bi,16($bp)
+	ld	$a3,24($ap)
+	ld	$bp,24($bp)
+
+	subfc	$a0,$t0,$a0
+	subfe	$a1,$t1,$a1
+	subfe	$a2,$bi,$a2
+	subfe	$a3,$bp,$a3
+
+	li	$t0,38
+	subfe	$t1,$t1,$t1		# borrow -> mask
+	xor	$zero,$zero,$zero
+	and	$t1,$t0,$t1
+
+	subfc	$a0,$t1,$a0
+	subfe	$a1,$zero,$a1
+	subfe	$a2,$zero,$a2
+	subfe	$a3,$zero,$a3
+
+	subfe	$t1,$t1,$t1		# borrow -> mask
+	std	$a1,8($rp)
+	and	$t0,$t0,$t1
+	std	$a2,16($rp)
+	subf	$a0,$t0,$a0
+	std	$a3,24($rp)
+	std	$a0,0($rp)
+
+	blr
+	.long	0
+	.byte	0,12,0x14,0,0,0,3,0
+	.long	0
+.size	x25519_fe64_sub,.-x25519_fe64_sub
+
+.globl	x25519_fe64_tobytes
+.type	x25519_fe64_tobytes,\@function
+.align	5
+x25519_fe64_tobytes:
+	ld	$a3,24($ap)
+	ld	$a0,0($ap)
+	ld	$a1,8($ap)
+	ld	$a2,16($ap)
+
+	sradi	$t0,$a3,63		# most significant bit -> mask
+	li	$t1,19
+	and	$t0,$t0,$t1
+	sldi	$a3,$a3,1
+	add	$t0,$t0,$t1		# compare to modulus in the same go
+	srdi	$a3,$a3,1		# most signifcant bit cleared
+
+	addc	$a0,$a0,$t0
+	addze	$a1,$a1
+	addze	$a2,$a2
+	addze	$a3,$a3
+
+	xor	$zero,$zero,$zero
+	sradi	$t0,$a3,63		# most significant bit -> mask
+	sldi	$a3,$a3,1
+	andc	$t0,$t1,$t0
+	srdi	$a3,$a3,1		# most signifcant bit cleared
+
+	subi	$rp,$rp,1
+	subfc	$a0,$t0,$a0
+	subfe	$a1,$zero,$a1
+	subfe	$a2,$zero,$a2
+	subfe	$a3,$zero,$a3
+
+___
+for (my @a=($a0,$a1,$a2,$a3), my $i=0; $i<4; shift(@a), $i++) {
+$code.=<<___;
+	srdi	$t0,@a[0],8
+	stbu	@a[0],1($rp)
+	srdi	@a[0],@a[0],16
+	stbu	$t0,1($rp)
+	srdi	$t0,@a[0],8
+	stbu	@a[0],1($rp)
+	srdi	@a[0],@a[0],16
+	stbu	$t0,1($rp)
+	srdi	$t0,@a[0],8
+	stbu	@a[0],1($rp)
+	srdi	@a[0],@a[0],16
+	stbu	$t0,1($rp)
+	srdi	$t0,@a[0],8
+	stbu	@a[0],1($rp)
+	stbu	$t0,1($rp)
+___
+}
+$code.=<<___;
+	blr
+	.long	0
+	.byte	0,12,0x14,0,0,0,2,0
+	.long	0
+.size	x25519_fe64_tobytes,.-x25519_fe64_tobytes
+___
+}
+####################################################### base 2^51
+{
+my ($bi,$a0,$a1,$a2,$a3,$a4,$t0, $t1,
+    $h0lo,$h0hi,$h1lo,$h1hi,$h2lo,$h2hi,$h3lo,$h3hi,$h4lo,$h4hi) =
+    map("r$_",(6..12,21..31));
+my $mask = "r0";
+my $FRAME = 18*8;
+
+$code.=<<___;
+.text
+
+.globl	x25519_fe51_mul
+.type	x25519_fe51_mul,\@function
+.align	5
+x25519_fe51_mul:
+	stdu	$sp,-$FRAME($sp)
+	std	r21,`$FRAME-8*11`($sp)
+	std	r22,`$FRAME-8*10`($sp)
+	std	r23,`$FRAME-8*9`($sp)
+	std	r24,`$FRAME-8*8`($sp)
+	std	r25,`$FRAME-8*7`($sp)
+	std	r26,`$FRAME-8*6`($sp)
+	std	r27,`$FRAME-8*5`($sp)
+	std	r28,`$FRAME-8*4`($sp)
+	std	r29,`$FRAME-8*3`($sp)
+	std	r30,`$FRAME-8*2`($sp)
+	std	r31,`$FRAME-8*1`($sp)
+
+	ld	$bi,0($bp)
+	ld	$a0,0($ap)
+	ld	$a1,8($ap)
+	ld	$a2,16($ap)
+	ld	$a3,24($ap)
+	ld	$a4,32($ap)
+
+	mulld	$h0lo,$a0,$bi		# a[0]*b[0]
+	mulhdu	$h0hi,$a0,$bi
+
+	mulld	$h1lo,$a1,$bi		# a[1]*b[0]
+	mulhdu	$h1hi,$a1,$bi
+
+	 mulld	$h4lo,$a4,$bi		# a[4]*b[0]
+	 mulhdu	$h4hi,$a4,$bi
+	 ld	$ap,8($bp)
+	 mulli	$a4,$a4,19
+
+	mulld	$h2lo,$a2,$bi		# a[2]*b[0]
+	mulhdu	$h2hi,$a2,$bi
+
+	mulld	$h3lo,$a3,$bi		# a[3]*b[0]
+	mulhdu	$h3hi,$a3,$bi
+___
+for(my @a=($a0,$a1,$a2,$a3,$a4),
+    my $i=1; $i<4; $i++) {
+	($ap,$bi) = ($bi,$ap);
+$code.=<<___;
+	mulld	$t0,@a[4],$bi
+	mulhdu	$t1,@a[4],$bi
+	addc	$h0lo,$h0lo,$t0
+	adde	$h0hi,$h0hi,$t1
+
+	mulld	$t0,@a[0],$bi
+	mulhdu	$t1,@a[0],$bi
+	addc	$h1lo,$h1lo,$t0
+	adde	$h1hi,$h1hi,$t1
+
+	 mulld	$t0,@a[3],$bi
+	 mulhdu	$t1,@a[3],$bi
+	 ld	$ap,`8*($i+1)`($bp)
+	 mulli	@a[3],@a[3],19
+	 addc	$h4lo,$h4lo,$t0
+	 adde	$h4hi,$h4hi,$t1
+
+	mulld	$t0,@a[1],$bi
+	mulhdu	$t1,@a[1],$bi
+	addc	$h2lo,$h2lo,$t0
+	adde	$h2hi,$h2hi,$t1
+
+	mulld	$t0,@a[2],$bi
+	mulhdu	$t1,@a[2],$bi
+	addc	$h3lo,$h3lo,$t0
+	adde	$h3hi,$h3hi,$t1
+___
+	unshift(@a,pop(@a));
+}
+	($ap,$bi) = ($bi,$ap);
+$code.=<<___;
+	mulld	$t0,$a1,$bi
+	mulhdu	$t1,$a1,$bi
+	addc	$h0lo,$h0lo,$t0
+	adde	$h0hi,$h0hi,$t1
+
+	mulld	$t0,$a2,$bi
+	mulhdu	$t1,$a2,$bi
+	addc	$h1lo,$h1lo,$t0
+	adde	$h1hi,$h1hi,$t1
+
+	mulld	$t0,$a3,$bi
+	mulhdu	$t1,$a3,$bi
+	addc	$h2lo,$h2lo,$t0
+	adde	$h2hi,$h2hi,$t1
+
+	mulld	$t0,$a4,$bi
+	mulhdu	$t1,$a4,$bi
+	addc	$h3lo,$h3lo,$t0
+	adde	$h3hi,$h3hi,$t1
+
+	mulld	$t0,$a0,$bi
+	mulhdu	$t1,$a0,$bi
+	addc	$h4lo,$h4lo,$t0
+	adde	$h4hi,$h4hi,$t1
+
+.Lfe51_reduce:
+	li	$mask,-1
+	srdi	$mask,$mask,13		# 0x7ffffffffffff
+
+	srdi	$t0,$h2lo,51
+	and	$a2,$h2lo,$mask
+	insrdi	$t0,$h2hi,51,0		# h2>>51
+	 srdi	$t1,$h0lo,51
+	 and	$a0,$h0lo,$mask
+	 insrdi	$t1,$h0hi,51,0		# h0>>51
+	addc	$h3lo,$h3lo,$t0
+	addze	$h3hi,$h3hi
+	 addc	$h1lo,$h1lo,$t1
+	 addze	$h1hi,$h1hi
+
+	srdi	$t0,$h3lo,51
+	and	$a3,$h3lo,$mask
+	insrdi	$t0,$h3hi,51,0		# h3>>51
+	 srdi	$t1,$h1lo,51
+	 and	$a1,$h1lo,$mask
+	 insrdi	$t1,$h1hi,51,0		# h1>>51
+	addc	$h4lo,$h4lo,$t0
+	addze	$h4hi,$h4hi
+	 add	$a2,$a2,$t1
+
+	srdi	$t0,$h4lo,51
+	and	$a4,$h4lo,$mask
+	insrdi	$t0,$h4hi,51,0
+	mulli	$t0,$t0,19		# (h4 >> 51) * 19
+
+	add	$a0,$a0,$t0
+
+	srdi	$t1,$a2,51
+	and	$a2,$a2,$mask
+	add	$a3,$a3,$t1
+
+	srdi	$t0,$a0,51
+	and	$a0,$a0,$mask
+	add	$a1,$a1,$t0
+
+	std	$a2,16($rp)
+	std	$a3,24($rp)
+	std	$a4,32($rp)
+	std	$a0,0($rp)
+	std	$a1,8($rp)
+
+	ld	r21,`$FRAME-8*11`($sp)
+	ld	r22,`$FRAME-8*10`($sp)
+	ld	r23,`$FRAME-8*9`($sp)
+	ld	r24,`$FRAME-8*8`($sp)
+	ld	r25,`$FRAME-8*7`($sp)
+	ld	r26,`$FRAME-8*6`($sp)
+	ld	r27,`$FRAME-8*5`($sp)
+	ld	r28,`$FRAME-8*4`($sp)
+	ld	r29,`$FRAME-8*3`($sp)
+	ld	r30,`$FRAME-8*2`($sp)
+	ld	r31,`$FRAME-8*1`($sp)
+	addi	$sp,$sp,$FRAME
+	blr
+	.long	0
+	.byte	0,12,4,0,0x80,11,3,0
+	.long	0
+.size	x25519_fe51_mul,.-x25519_fe51_mul
+___
+{
+my ($a0,$a1,$a2,$a3,$a4,$t0,$t1) = ($a0,$a1,$a2,$a3,$a4,$t0,$t1);
+$code.=<<___;
+.globl	x25519_fe51_sqr
+.type	x25519_fe51_sqr,\@function
+.align	5
+x25519_fe51_sqr:
+	stdu	$sp,-$FRAME($sp)
+	std	r21,`$FRAME-8*11`($sp)
+	std	r22,`$FRAME-8*10`($sp)
+	std	r23,`$FRAME-8*9`($sp)
+	std	r24,`$FRAME-8*8`($sp)
+	std	r25,`$FRAME-8*7`($sp)
+	std	r26,`$FRAME-8*6`($sp)
+	std	r27,`$FRAME-8*5`($sp)
+	std	r28,`$FRAME-8*4`($sp)
+	std	r29,`$FRAME-8*3`($sp)
+	std	r30,`$FRAME-8*2`($sp)
+	std	r31,`$FRAME-8*1`($sp)
+
+	ld	$a0,0($ap)
+	ld	$a1,8($ap)
+	ld	$a2,16($ap)
+	ld	$a3,24($ap)
+	ld	$a4,32($ap)
+
+	add	$bi,$a0,$a0		# a[0]*2
+	mulli	$t1,$a4,19		# a[4]*19
+
+	mulld	$h0lo,$a0,$a0
+	mulhdu	$h0hi,$a0,$a0
+	mulld	$h1lo,$a1,$bi
+	mulhdu	$h1hi,$a1,$bi
+	mulld	$h2lo,$a2,$bi
+	mulhdu	$h2hi,$a2,$bi
+	mulld	$h3lo,$a3,$bi
+	mulhdu	$h3hi,$a3,$bi
+	mulld	$h4lo,$a4,$bi
+	mulhdu	$h4hi,$a4,$bi
+	add	$bi,$a1,$a1		# a[1]*2
+___
+	($a4,$t1) = ($t1,$a4);
+$code.=<<___;
+	mulld	$t0,$t1,$a4
+	mulhdu	$t1,$t1,$a4
+	addc	$h3lo,$h3lo,$t0
+	adde	$h3hi,$h3hi,$t1
+
+	mulli	$bp,$a3,19		# a[3]*19
+
+	mulld	$t0,$a1,$a1
+	mulhdu	$t1,$a1,$a1
+	addc	$h2lo,$h2lo,$t0
+	adde	$h2hi,$h2hi,$t1
+	mulld	$t0,$a2,$bi
+	mulhdu	$t1,$a2,$bi
+	addc	$h3lo,$h3lo,$t0
+	adde	$h3hi,$h3hi,$t1
+	mulld	$t0,$a3,$bi
+	mulhdu	$t1,$a3,$bi
+	addc	$h4lo,$h4lo,$t0
+	adde	$h4hi,$h4hi,$t1
+	mulld	$t0,$a4,$bi
+	mulhdu	$t1,$a4,$bi
+	add	$bi,$a3,$a3		# a[3]*2
+	addc	$h0lo,$h0lo,$t0
+	adde	$h0hi,$h0hi,$t1
+___
+	($a3,$t1) = ($bp,$a3);
+$code.=<<___;
+	mulld	$t0,$t1,$a3
+	mulhdu	$t1,$t1,$a3
+	addc	$h1lo,$h1lo,$t0
+	adde	$h1hi,$h1hi,$t1
+	mulld	$t0,$bi,$a4
+	mulhdu	$t1,$bi,$a4
+	add	$bi,$a2,$a2		# a[2]*2
+	addc	$h2lo,$h2lo,$t0
+	adde	$h2hi,$h2hi,$t1
+
+	mulld	$t0,$a2,$a2
+	mulhdu	$t1,$a2,$a2
+	addc	$h4lo,$h4lo,$t0
+	adde	$h4hi,$h4hi,$t1
+	mulld	$t0,$a3,$bi
+	mulhdu	$t1,$a3,$bi
+	addc	$h0lo,$h0lo,$t0
+	adde	$h0hi,$h0hi,$t1
+	mulld	$t0,$a4,$bi
+	mulhdu	$t1,$a4,$bi
+	addc	$h1lo,$h1lo,$t0
+	adde	$h1hi,$h1hi,$t1
+
+	b	.Lfe51_reduce
+	.long	0
+	.byte	0,12,4,0,0x80,11,2,0
+	.long	0
+.size	x25519_fe51_sqr,.-x25519_fe51_sqr
+___
+}
+$code.=<<___;
+.globl	x25519_fe51_mul121666
+.type	x25519_fe51_mul121666,\@function
+.align	5
+x25519_fe51_mul121666:
+	stdu	$sp,-$FRAME($sp)
+	std	r21,`$FRAME-8*11`($sp)
+	std	r22,`$FRAME-8*10`($sp)
+	std	r23,`$FRAME-8*9`($sp)
+	std	r24,`$FRAME-8*8`($sp)
+	std	r25,`$FRAME-8*7`($sp)
+	std	r26,`$FRAME-8*6`($sp)
+	std	r27,`$FRAME-8*5`($sp)
+	std	r28,`$FRAME-8*4`($sp)
+	std	r29,`$FRAME-8*3`($sp)
+	std	r30,`$FRAME-8*2`($sp)
+	std	r31,`$FRAME-8*1`($sp)
+
+	lis	$bi,`65536>>16`
+	ori	$bi,$bi,`121666-65536`
+	ld	$a0,0($ap)
+	ld	$a1,8($ap)
+	ld	$a2,16($ap)
+	ld	$a3,24($ap)
+	ld	$a4,32($ap)
+
+	mulld	$h0lo,$a0,$bi		# a[0]*121666
+	mulhdu	$h0hi,$a0,$bi
+	mulld	$h1lo,$a1,$bi		# a[1]*121666
+	mulhdu	$h1hi,$a1,$bi
+	mulld	$h2lo,$a2,$bi		# a[2]*121666
+	mulhdu	$h2hi,$a2,$bi
+	mulld	$h3lo,$a3,$bi		# a[3]*121666
+	mulhdu	$h3hi,$a3,$bi
+	mulld	$h4lo,$a4,$bi		# a[4]*121666
+	mulhdu	$h4hi,$a4,$bi
+
+	b	.Lfe51_reduce
+	.long	0
+	.byte	0,12,4,0,0x80,11,2,0
+	.long	0
+.size	x25519_fe51_mul121666,.-x25519_fe51_mul121666
+___
+}
+
+$code =~ s/\`([^\`]*)\`/eval $1/gem;
+print $code;
+close STDOUT;

crypto/ec/build.info

@@ -27,6 +27,7 @@ INCLUDE[ecp_nistz256-armv8.o]=..
 GENERATE[ecp_nistz256-ppc64.s]=asm/ecp_nistz256-ppc64.pl $(PERLASM_SCHEME)
 
 GENERATE[x25519-x86_64.s]=asm/x25519-x86_64.pl $(PERLASM_SCHEME)
+GENERATE[x25519-ppc64.s]=asm/x25519-ppc64.pl $(PERLASM_SCHEME)
 
 BEGINRAW[Makefile]
 {- $builddir -}/ecp_nistz256-%.S:	{- $sourcedir -}/asm/ecp_nistz256-%.pl