dnl  SPARC v9 32-bit mpn_mul_1 -- Multiply a limb vector with a limb and store

dnl  the result in a second limb vector.

dnl  Copyright 1998, 2000, 2001, 2003 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl

dnl  The GNU MP Library is free software; you can redistribute it and/or modify

dnl  it under the terms of either:

dnl

dnl    * the GNU Lesser General Public License as published by the Free

dnl      Software Foundation; either version 3 of the License, or (at your

dnl      option) any later version.

dnl

dnl  or

dnl

dnl    * the GNU General Public License as published by the Free Software

dnl      Foundation; either version 2 of the License, or (at your option) any

dnl      later version.

dnl

dnl  or both in parallel, as here.

dnl

dnl  The GNU MP Library is distributed in the hope that it will be useful, but

dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

dnl  for more details.

dnl

dnl  You should have received copies of the GNU General Public License and the

dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,

dnl  see https://www.gnu.org/licenses/.

include(`../config.m4')

C Algorithm: We use two floating-point multiplies per limb product, with the

C invariant v operand split into two 16-bit pieces, and the u operand split

C into 32-bit pieces.  We convert the two 48-bit products and transfer them to

C the integer unit.

C		   cycles/limb

C UltraSPARC 1&2:     6.5

C UltraSPARC 3:	      ?

C Possible optimizations:

C   1. Combine 32-bit memory operations into 64-bit operations.  Since we're

C      memory bandwidth limited, this could save 1.5 cycles/limb.

C   2. Unroll the inner loop.  Since we already use alternate temporary areas,

C      it is very straightforward to unroll, using an exit branch midways.

C      Unrolling would allow deeper scheduling which could improve speed for L2

C      cache case.

C   3. For mpn_mul_1: Use more alternating temp areas.  The std'es and ldx'es

C      aren't sufficiently apart-scheduled with just two temp areas.

C   4. Specialize for particular v values.  If its upper 16 bits are zero, we

C      could save many operations.

C INPUT PARAMETERS

C rp	i0

C up	i1

C n	i2

C v	i3

define(`FSIZE',224)

ASM_START()

PROLOGUE(mpn_mul_1)

	add	%sp, -FSIZE, %sp

	sethi	%hi(0xffff), %g1

	srl	%o3, 16, %g2

	or	%g1, %lo(0xffff), %g1

	and	%o3, %g1, %g1

	stx	%g1, [%sp+104]

	stx	%g2, [%sp+112]

	ldd	[%sp+104], %f6

	ldd	[%sp+112], %f8

	fxtod	%f6, %f6

	fxtod	%f8, %f8

	ld	[%sp+104], %f10		C zero f10

	mov	0, %g3			C cy = 0

define(`fanop', `fitod %f18, %f0')	C  A quasi nop running in the FA pipe

	add	%sp, 160, %o5		C point in scratch area

	and	%o5, -32, %o5		C align at 0 (mod 32) in scratch area

	subcc	%o2, 1, %o2

	ld	[%o1], %f11		C read up[i]

	add	%o1, 4, %o1		C up++

	bne,pt	%icc, .L_two_or_more

	fxtod	%f10, %f2

	fmuld	%f2, %f8, %f16

	fmuld	%f2, %f6, %f4

	fdtox	%f16, %f14

	fdtox	%f4, %f12

	std	%f14, [%o5+16]

	std	%f12, [%o5+24]

	ldx	[%o5+16], %g2		C p16

	ldx	[%o5+24], %g1		C p0

	b	.L1

	add	%o0, -16, %o0

	.align	16

.L_two_or_more:

	subcc	%o2, 1, %o2

	ld	[%o1], %f11		C read up[i]

	fmuld	%f2, %f8, %f16

	fmuld	%f2, %f6, %f4

	add	%o1, 4, %o1		C up++

	bne,pt	%icc, .L_three_or_more

	fxtod	%f10, %f2

	fdtox	%f16, %f14

	fdtox	%f4, %f12

	std	%f14, [%o5+16]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+24]

	fmuld	%f2, %f6, %f4

	fdtox	%f16, %f14

	fdtox	%f4, %f12

	std	%f14, [%o5+0]

	std	%f12, [%o5+8]

	ldx	[%o5+16], %g2		C p16

	ldx	[%o5+24], %g1		C p0

	b	.L2

	add	%o0, -12, %o0

	.align	16

.L_three_or_more:

	subcc	%o2, 1, %o2

	ld	[%o1], %f11		C read up[i]

	fdtox	%f16, %f14

	fdtox	%f4, %f12

	std	%f14, [%o5+16]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+24]

	fmuld	%f2, %f6, %f4

	add	%o1, 4, %o1		C up++

	bne,pt	%icc, .L_four_or_more

	fxtod	%f10, %f2

	fdtox	%f16, %f14

	fdtox	%f4, %f12

	std	%f14, [%o5+0]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+8]

	fmuld	%f2, %f6, %f4

	fdtox	%f16, %f14

	ldx	[%o5+16], %g2		C p16

	fdtox	%f4, %f12

	ldx	[%o5+24], %g1		C p0

	std	%f14, [%o5+16]

	std	%f12, [%o5+24]

	b	.L3

	add	%o0, -8, %o0

	.align	16

.L_four_or_more:

	subcc	%o2, 1, %o2

	ld	[%o1], %f11		C read up[i]

	fdtox	%f16, %f14

	fdtox	%f4, %f12

	std	%f14, [%o5+0]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+8]

	fmuld	%f2, %f6, %f4

	add	%o1, 4, %o1		C up++

	bne,pt	%icc, .L_five_or_more

	fxtod	%f10, %f2

	fdtox	%f16, %f14

	ldx	[%o5+16], %g2		C p16

	fdtox	%f4, %f12

	ldx	[%o5+24], %g1		C p0

	std	%f14, [%o5+16]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+24]

	fmuld	%f2, %f6, %f4

	add	%o1, 4, %o1		C up++

	b	.L4

	add	%o0, -4, %o0

	.align	16

.L_five_or_more:

	subcc	%o2, 1, %o2

	ld	[%o1], %f11		C read up[i]

	fdtox	%f16, %f14

	ldx	[%o5+16], %g2		C p16

	fdtox	%f4, %f12

	ldx	[%o5+24], %g1		C p0

	std	%f14, [%o5+16]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+24]

	fmuld	%f2, %f6, %f4

	add	%o1, 4, %o1		C up++

	bne,pt	%icc, .Loop

	fxtod	%f10, %f2

	b,a	.L5

C BEGIN MAIN LOOP

	.align 16

C -- 0

.Loop:	nop

	subcc	%o2, 1, %o2

	ld	[%o1], %f11		C read up[i]

	fdtox	%f16, %f14

C -- 1

	sllx	%g2, 16, %g4		C (p16 << 16)

	add	%o0, 4, %o0		C rp++

	ldx	[%o5+0], %g2		C p16

	fdtox	%f4, %f12

C -- 2

	nop

	add	%g1, %g4, %g4		C p = p0 + (p16 << 16)

	ldx	[%o5+8], %g1		C p0

	fanop

C -- 3

	nop

	add	%g3, %g4, %g4		C p += cy

	std	%f14, [%o5+0]

	fmuld	%f2, %f8, %f16

C -- 4

	srlx	%g4, 32, %g3		C new cy

	add	%o1, 4, %o1		C up++

	std	%f12, [%o5+8]

	fmuld	%f2, %f6, %f4

C -- 5

	xor	%o5, 16, %o5		C alternate scratch variables

	stw	%g4, [%o0-4]

	bne,pt	%icc, .Loop

	fxtod	%f10, %f2

C END MAIN LOOP

.L5:	fdtox	%f16, %f14

	sllx	%g2, 16, %g4		C (p16 << 16)

	ldx	[%o5+0], %g2		C p16

	fdtox	%f4, %f12

	add	%g1, %g4, %g4		C p = p0 + (p16 << 16)

	ldx	[%o5+8], %g1		C p0

	add	%g4, %g3, %g4		C p += cy

	std	%f14, [%o5+0]

	fmuld	%f2, %f8, %f16

	std	%f12, [%o5+8]

	fmuld	%f2, %f6, %f4

	xor	%o5, 16, %o5

	stw	%g4, [%o0+0]

	srlx	%g4, 32, %g3		C new cy

.L4:	fdtox	%f16, %f14

	sllx	%g2, 16, %g4		C (p16 << 16)

	ldx	[%o5+0], %g2		C p16

	fdtox	%f4, %f12

	add	%g1, %g4, %g4		C p = p0 + (p16 << 16)

	ldx	[%o5+8], %g1		C p0

	add	%g3, %g4, %g4		C p += cy

	std	%f14, [%o5+0]

	std	%f12, [%o5+8]

	xor	%o5, 16, %o5

	stw	%g4, [%o0+4]

	srlx	%g4, 32, %g3		C new cy

.L3:	sllx	%g2, 16, %g4		C (p16 << 16)

	ldx	[%o5+0], %g2		C p16

	add	%g1, %g4, %g4		C p = p0 + (p16 << 16)

	ldx	[%o5+8], %g1		C p0

	add	%g3, %g4, %g4		C p += cy

	xor	%o5, 16, %o5

	stw	%g4, [%o0+8]

	srlx	%g4, 32, %g3		C new cy

.L2:	sllx	%g2, 16, %g4		C (p16 << 16)

	ldx	[%o5+0], %g2		C p16

	add	%g1, %g4, %g4		C p = p0 + (p16 << 16)

	ldx	[%o5+8], %g1		C p0

	add	%g3, %g4, %g4		C p += cy

	stw	%g4, [%o0+12]

	srlx	%g4, 32, %g3		C new cy

.L1:	sllx	%g2, 16, %g4		C (p16 << 16)

	add	%g1, %g4, %g4		C p = p0 + (p16 << 16)

	add	%g3, %g4, %g4		C p += cy

	stw	%g4, [%o0+16]

	srlx	%g4, 32, %g3		C new cy

	mov	%g3, %o0

	retl

	sub	%sp, -FSIZE, %sp

EPILOGUE(mpn_mul_1)