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179 lines
4.3 KiB
ArmAsm
179 lines
4.3 KiB
ArmAsm
/* PowerPC-32 lshift
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* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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#ifndef USE_PPC_PATCHES
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/*******************
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* mpi_limb_t
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* mpihelp_lshift( mpi_ptr_t wp, (r3)
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* mpi_ptr_t up, (r4)
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* mpi_size_t usize, (r5)
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* unsigned cnt) (r6)
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*/
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.toc
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.csect .text[PR]
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.align 2
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.globl mpihelp_lshift
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.globl .mpihelp_lshift
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.csect mpihelp_lshift[DS]
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mpihelp_lshift:
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.long .mpihelp_lshift, TOC[tc0], 0
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.csect .text[PR]
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.mpihelp_lshift:
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mtctr 5 # copy size into CTR
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slwi 0,5,2
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add 7,3,0 # make r7 point at end of res
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add 4,4,0 # make r4 point at end of s1
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subfic 8,6,32
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lwzu 11,-4(4) # load first s1 limb
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srw 3,11,8 # compute function return value
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bdz Lend1
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Loop: lwzu 10,-4(4)
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slw 9,11,6
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srw 12,10,8
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or 9,9,12
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stwu 9,-4(7)
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bdz Lend2
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lwzu 11,-4(4)
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slw 9,10,6
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srw 12,11,8
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or 9,9,12
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stwu 9,-4(7)
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bdnz Loop
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Lend1: slw 0,11,6
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stw 0,-4(7)
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blr
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Lend2: slw 0,10,6
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stw 0,-4(7)
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blr
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#else
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/* mp_limb_t mpn_lshift (mp_ptr wp, mp_srcptr up, mp_size_t usize,
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unsigned int cnt) */
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EALIGN(mpihelp_lshift,3,0)
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mtctr %r5 # copy size into CTR
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cmplwi %cr0,%r5,16 # is size < 16
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slwi %r0,%r5,2
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add %r7,%r3,%r0 # make r7 point at end of res
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add %r4,%r4,%r0 # make r4 point at end of s1
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lwzu %r11,-4(%r4) # load first s1 limb
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subfic %r8,%r6,32
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srw %r3,%r11,%r8 # compute function return value
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bge %cr0,L(big) # branch if size >= 16
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bdz L(end1)
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0: lwzu %r10,-4(%r4)
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slw %r9,%r11,%r6
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srw %r12,%r10,%r8
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or %r9,%r9,%r12
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stwu %r9,-4(%r7)
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bdz L(end2)
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lwzu %r11,-4(%r4)
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slw %r9,%r10,%r6
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srw %r12,%r11,%r8
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or %r9,%r9,%r12
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stwu %r9,-4(%r7)
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bdnz 0b
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L(end1):slw %r0,%r11,%r6
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stw %r0,-4(%r7)
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blr
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/* Guaranteed not to succeed. */
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L(boom): tweq %r0,%r0
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/* We imitate a case statement, by using (yuk!) fixed-length code chunks,
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of size 4*12 bytes. We have to do this (or something) to make this PIC. */
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L(big): mflr %r9
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bltl- %cr0,L(boom) # Never taken, only used to set LR.
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slwi %r10,%r6,4
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mflr %r12
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add %r10,%r12,%r10
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slwi %r8,%r6,5
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add %r10,%r8,%r10
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mtctr %r10
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addi %r5,%r5,-1
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mtlr %r9
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bctr
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L(end2):slw %r0,%r10,%r6
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stw %r0,-4(%r7)
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blr
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#define DO_LSHIFT(n) \
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mtctr %r5; \
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0: lwzu %r10,-4(%r4); \
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slwi %r9,%r11,n; \
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inslwi %r9,%r10,n,32-n; \
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stwu %r9,-4(%r7); \
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bdz- L(end2); \
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lwzu %r11,-4(%r4); \
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slwi %r9,%r10,n; \
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inslwi %r9,%r11,n,32-n; \
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stwu %r9,-4(%r7); \
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bdnz 0b; \
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b L(end1)
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DO_LSHIFT(1)
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DO_LSHIFT(2)
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DO_LSHIFT(3)
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DO_LSHIFT(4)
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DO_LSHIFT(5)
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DO_LSHIFT(6)
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DO_LSHIFT(7)
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DO_LSHIFT(8)
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DO_LSHIFT(9)
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DO_LSHIFT(10)
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DO_LSHIFT(11)
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DO_LSHIFT(12)
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DO_LSHIFT(13)
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DO_LSHIFT(14)
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DO_LSHIFT(15)
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DO_LSHIFT(16)
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DO_LSHIFT(17)
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DO_LSHIFT(18)
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DO_LSHIFT(19)
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DO_LSHIFT(20)
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DO_LSHIFT(21)
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DO_LSHIFT(22)
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DO_LSHIFT(23)
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DO_LSHIFT(24)
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DO_LSHIFT(25)
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DO_LSHIFT(26)
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DO_LSHIFT(27)
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DO_LSHIFT(28)
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DO_LSHIFT(29)
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DO_LSHIFT(30)
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DO_LSHIFT(31)
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END(mpihelp_lshift)
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#endif
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