1996-03-01 18:43:45 +00:00
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/* mc68020 __mpn_rshift -- Shift right a low-level natural-number integer.
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2020-01-01 00:14:33 +00:00
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Copyright (C) 1996-2020 Free Software Foundation, Inc.
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1996-03-01 18:43:45 +00:00
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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2001-07-07 10:13:33 +00:00
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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1996-03-01 18:43:45 +00:00
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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2001-07-07 10:13:33 +00:00
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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1996-03-01 18:43:45 +00:00
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License for more details.
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2001-07-07 10:13:33 +00:00
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You should have received a copy of the GNU Lesser General Public License
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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along with the GNU MP Library. If not, see <https://www.gnu.org/licenses/>. */
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1996-03-01 18:43:45 +00:00
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/*
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INPUT PARAMETERS
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res_ptr (sp + 4)
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s_ptr (sp + 8)
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s_size (sp + 16)
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cnt (sp + 12)
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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#define res_ptr a1
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#define s_ptr a0
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#define s_size d6
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#define cnt d4
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TEXT
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1998-03-06 01:48:50 +00:00
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ENTRY(__mpn_rshift)
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1996-03-01 18:43:45 +00:00
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/* Save used registers on the stack. */
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moveml R(d2)-R(d6)/R(a2),MEM_PREDEC(sp)
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2012-01-05 13:52:48 +00:00
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cfi_adjust_cfa_offset (6*4)
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cfi_rel_offset (R(d2), 0)
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cfi_rel_offset (R(d3), 4)
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cfi_rel_offset (R(d4), 8)
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cfi_rel_offset (R(d5), 12)
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cfi_rel_offset (R(d6), 16)
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cfi_rel_offset (R(a2), 20)
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1996-03-01 18:43:45 +00:00
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/* Copy the arguments to registers. */
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movel MEM_DISP(sp,28),R(res_ptr)
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movel MEM_DISP(sp,32),R(s_ptr)
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movel MEM_DISP(sp,36),R(s_size)
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movel MEM_DISP(sp,40),R(cnt)
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moveql #1,R(d5)
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cmpl R(d5),R(cnt)
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bne L(Lnormal)
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cmpl R(res_ptr),R(s_ptr)
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bls L(Lspecial) /* jump if res_ptr >= s_ptr */
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#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
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lea MEM_INDX1(res_ptr,s_size,l,4),R(a2)
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#else /* not mc68020 */
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movel R(s_size),R(d0)
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asll #2,R(d0)
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lea MEM_INDX(res_ptr,d0,l),R(a2)
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#endif
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cmpl R(s_ptr),R(a2)
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bls L(Lspecial) /* jump if s_ptr >= res_ptr + s_size */
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L(Lnormal:)
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moveql #32,R(d5)
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subl R(cnt),R(d5)
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movel MEM_POSTINC(s_ptr),R(d2)
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movel R(d2),R(d0)
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lsll R(d5),R(d0) /* compute carry limb */
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1996-12-20 01:35:29 +00:00
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1996-03-01 18:43:45 +00:00
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lsrl R(cnt),R(d2)
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movel R(d2),R(d1)
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subql #1,R(s_size)
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beq L(Lend)
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lsrl #1,R(s_size)
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bcs L(L1)
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subql #1,R(s_size)
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L(Loop:)
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movel MEM_POSTINC(s_ptr),R(d2)
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movel R(d2),R(d3)
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lsll R(d5),R(d3)
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orl R(d3),R(d1)
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movel R(d1),MEM_POSTINC(res_ptr)
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lsrl R(cnt),R(d2)
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L(L1:)
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movel MEM_POSTINC(s_ptr),R(d1)
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movel R(d1),R(d3)
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lsll R(d5),R(d3)
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orl R(d3),R(d2)
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movel R(d2),MEM_POSTINC(res_ptr)
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lsrl R(cnt),R(d1)
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dbf R(s_size),L(Loop)
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subl #0x10000,R(s_size)
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bcc L(Loop)
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L(Lend:)
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movel R(d1),MEM(res_ptr) /* store most significant limb */
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/* Restore used registers from stack frame. */
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moveml MEM_POSTINC(sp),R(d2)-R(d6)/R(a2)
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2012-01-05 13:52:48 +00:00
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cfi_remember_state
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cfi_adjust_cfa_offset (-6*4)
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cfi_restore (R(d2))
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cfi_restore (R(d3))
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cfi_restore (R(d4))
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cfi_restore (R(d5))
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cfi_restore (R(d6))
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cfi_restore (R(a2))
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1996-03-01 18:43:45 +00:00
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rts
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/* We loop from most significant end of the arrays, which is only
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1996-12-20 01:35:29 +00:00
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permissible if the source and destination don't overlap, since the
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1996-03-01 18:43:45 +00:00
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function is documented to work for overlapping source and destination. */
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2012-01-05 13:52:48 +00:00
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cfi_restore_state
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1996-03-01 18:43:45 +00:00
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L(Lspecial:)
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#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
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lea MEM_INDX1(s_ptr,s_size,l,4),R(s_ptr)
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lea MEM_INDX1(res_ptr,s_size,l,4),R(res_ptr)
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#else /* not mc68000 */
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movel R(s_size),R(d0)
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asll #2,R(d0)
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addl R(s_size),R(s_ptr)
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addl R(s_size),R(res_ptr)
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#endif
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clrl R(d0) /* initialize carry */
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eorw #1,R(s_size)
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lsrl #1,R(s_size)
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bcc L(LL1)
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subql #1,R(s_size)
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L(LLoop:)
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movel MEM_PREDEC(s_ptr),R(d2)
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roxrl #1,R(d2)
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movel R(d2),MEM_PREDEC(res_ptr)
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L(LL1:)
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movel MEM_PREDEC(s_ptr),R(d2)
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roxrl #1,R(d2)
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movel R(d2),MEM_PREDEC(res_ptr)
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dbf R(s_size),L(LLoop)
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roxrl #1,R(d0) /* save cy in msb */
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subl #0x10000,R(s_size)
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bcs L(LLend)
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addl R(d0),R(d0) /* restore cy */
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bra L(LLoop)
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L(LLend:)
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/* Restore used registers from stack frame. */
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moveml MEM_POSTINC(sp),R(d2)-R(d6)/R(a2)
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2012-01-05 13:52:48 +00:00
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cfi_adjust_cfa_offset (-6*4)
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cfi_restore (R(d2))
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cfi_restore (R(d3))
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cfi_restore (R(d4))
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cfi_restore (R(d5))
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cfi_restore (R(d6))
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cfi_restore (R(a2))
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1996-03-01 18:43:45 +00:00
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rts
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1998-03-06 01:48:50 +00:00
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END(__mpn_rshift)
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