glibc/sysdeps/powerpc/lshift.S
Ulrich Drepper 217eb19b6f Update.
1999-10-11  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/powerpc/Makefile [math] (libm-support): Remove t_sqrt.

	* sysdeps/powerpc/e_sqrt.c: Moved to...
	* sysdeps/powerpc/fpu/e_sqrt.c: ...here.
	* sysdeps/powerpc/e_sqrtf.c: Moved to...
	* sysdeps/powerpc/fpu/e_sqrtf.c: ...here.

	* sysdeps/powerpc/submul_1.S: Adjust asm syntax.
	* sysdeps/powerpc/sub_n.S: Likewise.
	* sysdeps/powerpc/strlen.S: Likewise.
	* sysdeps/powerpc/strcpy.S: Likewise.
	* sysdeps/powerpc/strcmp.S: Likewise.
	* sysdeps/powerpc/strchr.S: Likewise.
	* sysdeps/powerpc/stpcpy.S: Likewise.
	* sysdeps/powerpc/setjmp.S: Likewise.
	* sysdeps/powerpc/rshift.S: Likewise.
	* sysdeps/powerpc/ppc-mcount.S: Likewise.
	* sysdeps/powerpc/mul_1.S: Likewise.
	* sysdeps/powerpc/memset.S: Likewise.
	* sysdeps/powerpc/lshift.S: Likewise.
	* sysdeps/powerpc/dl-start.S: Likewise.
	* sysdeps/powerpc/bzero.S: Likewise.
	* sysdeps/powerpc/bsd-setjmp.S: Likewise.
	* sysdeps/powerpc/bsd-_setjmp.S: Likewise.
	* sysdeps/powerpc/addmul_1.S: Likewise.
	* sysdeps/powerpc/add_n.S: Likewise.
	* sysdeps/powerpc/__longjmp.S: Likewise.
	* sysdeps/powerpc/elf/start.S: Likewise.

1999-10-11  Cristian Gafton  <gafton@redhat.com>

	* sysdeps/unix/sysv/linux/alpha/bits/sigaction.h: Declare
1999-10-11 22:31:36 +00:00

124 lines
2.8 KiB
ArmAsm

/* Shift a limb left, low level routine.
Copyright (C) 1996, 1997, 1999 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
/* mp_limb_t mpn_lshift (mp_ptr wp, mp_srcptr up, mp_size_t usize,
unsigned int cnt) */
EALIGN(__mpn_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(__mpn_lshift)