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-/* alpha lshift
- * Copyright (C) 1994, 1995 Free Software Foundation, Inc.
- * Copyright (C) 1998 Free Software Foundation, Inc.
- *
- * This file is part of GNUPG.
- *
- * GNUPG is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * GNUPG is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- *
- * Note: This code is heavily based on the GNU MP Library.
- * Actually it's the same code with only minor changes in the
- * way the data is stored; this is to support the abstraction
- * of an optional secure memory allocation which may be used
- * to avoid revealing of sensitive data due to paging etc.
- * The GNU MP Library itself is published under the LGPL;
- * however I decided to publish this code under the plain GPL.
- */
-
-
-
-/*******************
- * mpi_limb_t
- * mpihelp_lshift( mpi_ptr_t wp, (r16)
- * mpi_ptr_t up, (r17)
- * mpi_size_t usize, (r18)
- * unsigned cnt) (r19)
- *
- * This code runs at 4.8 cycles/limb on the 21064. With infinite unrolling,
- * it would take 4 cycles/limb. It should be possible to get down to 3
- * cycles/limb since both ldq and stq can be paired with the other used
- * instructions. But there are many restrictions in the 21064 pipeline that
- * makes it hard, if not impossible, to get down to 3 cycles/limb:
- *
- * 1. ldq has a 3 cycle delay, srl and sll have a 2 cycle delay.
- * 2. Only aligned instruction pairs can be paired.
- * 3. The store buffer or silo might not be able to deal with the bandwidth.
- */
-
- .set noreorder
- .set noat
-.text
- .align 3
- .globl mpihelp_lshift
- .ent mpihelp_lshift
-mpihelp_lshift:
- .frame $30,0,$26,0
-
- s8addq $18,$17,$17 # make r17 point at end of s1
- ldq $4,-8($17) # load first limb
- subq $17,8,$17
- subq $31,$19,$7
- s8addq $18,$16,$16 # make r16 point at end of RES
- subq $18,1,$18
- and $18,4-1,$20 # number of limbs in first loop
- srl $4,$7,$0 # compute function result
-
- beq $20,.L0
- subq $18,$20,$18
-
- .align 3
-.Loop0:
- ldq $3,-8($17)
- subq $16,8,$16
- subq $17,8,$17
- subq $20,1,$20
- sll $4,$19,$5
- srl $3,$7,$6
- bis $3,$3,$4
- bis $5,$6,$8
- stq $8,0($16)
- bne $20,.Loop0
-
-.L0: beq $18,.Lend
-
- .align 3
-.Loop: ldq $3,-8($17)
- subq $16,32,$16
- subq $18,4,$18
- sll $4,$19,$5
- srl $3,$7,$6
-
- ldq $4,-16($17)
- sll $3,$19,$1
- bis $5,$6,$8
- stq $8,24($16)
- srl $4,$7,$2
-
- ldq $3,-24($17)
- sll $4,$19,$5
- bis $1,$2,$8
- stq $8,16($16)
- srl $3,$7,$6
-
- ldq $4,-32($17)
- sll $3,$19,$1
- bis $5,$6,$8
- stq $8,8($16)
- srl $4,$7,$2
-
- subq $17,32,$17
- bis $1,$2,$8
- stq $8,0($16)
-
- bgt $18,.Loop
-
-.Lend: sll $4,$19,$8
- stq $8,-8($16)
- ret $31,($26),1
- .end mpihelp_lshift
-
-