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Diffstat (limited to 'mpi/powerpc32/mpih-lshift.S')
| -rw-r--r-- | mpi/powerpc32/mpih-lshift.S | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/mpi/powerpc32/mpih-lshift.S b/mpi/powerpc32/mpih-lshift.S new file mode 100644 index 0000000..4e5da5b --- /dev/null +++ b/mpi/powerpc32/mpih-lshift.S @@ -0,0 +1,199 @@ +/* PowerPC-32 lshift + * + * Copyright (C) 1995, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +#include "sysdep.h" +#include "asm-syntax.h" + + +#ifndef USE_PPC_PATCHES + +/******************* + * mpi_limb_t + * mpihelp_lshift( mpi_ptr_t wp, (r3) + * mpi_ptr_t up, (r4) + * mpi_size_t usize, (r5) + * unsigned cnt) (r6) + */ + + .toc +.csect .text[PR] + .align 2 + .globl mpihelp_lshift + .globl .mpihelp_lshift + .csect mpihelp_lshift[DS] +mpihelp_lshift: + .long .mpihelp_lshift, TOC[tc0], 0 + .csect .text[PR] +.mpihelp_lshift: + mtctr 5 # copy size into CTR + slwi 0,5,2 + add 7,3,0 # make r7 point at end of res + add 4,4,0 # make r4 point at end of s1 + subfic 8,6,32 + lwzu 11,-4(4) # load first s1 limb + srw 3,11,8 # compute function return value + bdz Lend1 + +Loop: lwzu 10,-4(4) + slw 9,11,6 + srw 12,10,8 + or 9,9,12 + stwu 9,-4(7) + bdz Lend2 + lwzu 11,-4(4) + slw 9,10,6 + srw 12,11,8 + or 9,9,12 + stwu 9,-4(7) + bdnz Loop + +Lend1: slw 0,11,6 + stw 0,-4(7) + blr + +Lend2: slw 0,10,6 + stw 0,-4(7) + blr + +#else +/* Shift a limb left, low level routine. + Copyright (C) 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ + +/* mp_limb_t mpn_lshift (mp_ptr wp, mp_srcptr up, mp_size_t usize, + unsigned int cnt) */ + +EALIGN(mpihelp_lshift,3,0) + mtctr %r5 # copy size into CTR + cmplwi %cr0,%r5,16 # is size < 16 + slwi %r0,%r5,2 + add %r7,%r3,%r0 # make r7 point at end of res + add %r4,%r4,%r0 # make r4 point at end of s1 + lwzu %r11,-4(%r4) # load first s1 limb + subfic %r8,%r6,32 + srw %r3,%r11,%r8 # compute function return value + bge %cr0,L(big) # branch if size >= 16 + + bdz L(end1) + +0: lwzu %r10,-4(%r4) + slw %r9,%r11,%r6 + srw %r12,%r10,%r8 + or %r9,%r9,%r12 + stwu %r9,-4(%r7) + bdz L(end2) + lwzu %r11,-4(%r4) + slw %r9,%r10,%r6 + srw %r12,%r11,%r8 + or %r9,%r9,%r12 + stwu %r9,-4(%r7) + bdnz 0b + +L(end1):slw %r0,%r11,%r6 + stw %r0,-4(%r7) + blr + + +/* Guaranteed not to succeed. */ +L(boom): tweq %r0,%r0 + +/* We imitate a case statement, by using (yuk!) fixed-length code chunks, + of size 4*12 bytes. We have to do this (or something) to make this PIC. */ +L(big): mflr %r9 + bltl- %cr0,L(boom) # Never taken, only used to set LR. + slwi %r10,%r6,4 + mflr %r12 + add %r10,%r12,%r10 + slwi %r8,%r6,5 + add %r10,%r8,%r10 + mtctr %r10 + addi %r5,%r5,-1 + mtlr %r9 + bctr + +L(end2):slw %r0,%r10,%r6 + stw %r0,-4(%r7) + blr + +#define DO_LSHIFT(n) \ + mtctr %r5; \ +0: lwzu %r10,-4(%r4); \ + slwi %r9,%r11,n; \ + inslwi %r9,%r10,n,32-n; \ + stwu %r9,-4(%r7); \ + bdz- L(end2); \ + lwzu %r11,-4(%r4); \ + slwi %r9,%r10,n; \ + inslwi %r9,%r11,n,32-n; \ + stwu %r9,-4(%r7); \ + bdnz 0b; \ + b L(end1) + + DO_LSHIFT(1) + DO_LSHIFT(2) + DO_LSHIFT(3) + DO_LSHIFT(4) + DO_LSHIFT(5) + DO_LSHIFT(6) + DO_LSHIFT(7) + DO_LSHIFT(8) + DO_LSHIFT(9) + DO_LSHIFT(10) + DO_LSHIFT(11) + DO_LSHIFT(12) + DO_LSHIFT(13) + DO_LSHIFT(14) + DO_LSHIFT(15) + DO_LSHIFT(16) + DO_LSHIFT(17) + DO_LSHIFT(18) + DO_LSHIFT(19) + DO_LSHIFT(20) + DO_LSHIFT(21) + DO_LSHIFT(22) + DO_LSHIFT(23) + DO_LSHIFT(24) + DO_LSHIFT(25) + DO_LSHIFT(26) + DO_LSHIFT(27) + DO_LSHIFT(28) + DO_LSHIFT(29) + DO_LSHIFT(30) + DO_LSHIFT(31) + +END(mpihelp_lshift) +#endif |