--- /dev/null
+dnl x86 mpn_add_n/mpn_sub_n -- mpn addition and subtraction.
+
+dnl Copyright 1992, 1994, 1995, 1996, 1999, 2000, 2001, 2002 Free Software
+dnl Foundation, Inc.
+dnl
+dnl This file is part of the GNU MP Library.
+dnl
+dnl The GNU MP Library is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU Lesser General Public License as
+dnl published by the Free Software Foundation; either version 3 of the
+dnl License, or (at your option) any later version.
+dnl
+dnl The GNU MP Library is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl Lesser General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU Lesser General Public License
+dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+
+C cycles/limb
+C P5: 3.375
+C P6: 3.125
+C K6: 3.5
+C K7: 2.25
+C P4: 8.75
+
+
+ifdef(`OPERATION_add_n',`
+ define(M4_inst, adcl)
+ define(M4_function_n, mpn_add_n)
+ define(M4_function_nc, mpn_add_nc)
+
+',`ifdef(`OPERATION_sub_n',`
+ define(M4_inst, sbbl)
+ define(M4_function_n, mpn_sub_n)
+ define(M4_function_nc, mpn_sub_nc)
+
+',`m4_error(`Need OPERATION_add_n or OPERATION_sub_n
+')')')
+
+MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
+
+
+C mp_limb_t M4_function_n (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
+C mp_size_t size);
+C mp_limb_t M4_function_nc (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
+C mp_size_t size, mp_limb_t carry);
+
+defframe(PARAM_CARRY,20)
+defframe(PARAM_SIZE, 16)
+defframe(PARAM_SRC2, 12)
+defframe(PARAM_SRC1, 8)
+defframe(PARAM_DST, 4)
+
+ TEXT
+ ALIGN(8)
+
+PROLOGUE(M4_function_nc)
+deflit(`FRAME',0)
+
+ pushl %edi FRAME_pushl()
+ pushl %esi FRAME_pushl()
+
+ movl PARAM_DST,%edi
+ movl PARAM_SRC1,%esi
+ movl PARAM_SRC2,%edx
+ movl PARAM_SIZE,%ecx
+
+ movl %ecx,%eax
+ shrl $3,%ecx C compute count for unrolled loop
+ negl %eax
+ andl $7,%eax C get index where to start loop
+ jz L(oopgo) C necessary special case for 0
+ incl %ecx C adjust loop count
+ shll $2,%eax C adjustment for pointers...
+ subl %eax,%edi C ... since they are offset ...
+ subl %eax,%esi C ... by a constant when we ...
+ subl %eax,%edx C ... enter the loop
+ shrl $2,%eax C restore previous value
+
+ifdef(`PIC',`
+ C Calculate start address in loop for PIC. Due to limitations in
+ C old gas, LF(M4_function_n,oop)-L(0a)-3 cannot be put into the leal
+ call L(0a)
+L(0a): leal (%eax,%eax,8),%eax
+ addl (%esp),%eax
+ addl $L(oop)-L(0a)-3,%eax
+ addl $4,%esp
+',`
+ C Calculate start address in loop for non-PIC.
+ leal L(oop)-3(%eax,%eax,8),%eax
+')
+
+ C These lines initialize carry from the 5th parameter. Should be
+ C possible to simplify.
+ pushl %ebp FRAME_pushl()
+ movl PARAM_CARRY,%ebp
+ shrl $1,%ebp C shift bit 0 into carry
+ popl %ebp FRAME_popl()
+
+ jmp *%eax C jump into loop
+
+EPILOGUE()
+
+
+ ALIGN(16)
+PROLOGUE(M4_function_n)
+deflit(`FRAME',0)
+
+ pushl %edi FRAME_pushl()
+ pushl %esi FRAME_pushl()
+
+ movl PARAM_DST,%edi
+ movl PARAM_SRC1,%esi
+ movl PARAM_SRC2,%edx
+ movl PARAM_SIZE,%ecx
+
+ movl %ecx,%eax
+ shrl $3,%ecx C compute count for unrolled loop
+ negl %eax
+ andl $7,%eax C get index where to start loop
+ jz L(oop) C necessary special case for 0
+ incl %ecx C adjust loop count
+ shll $2,%eax C adjustment for pointers...
+ subl %eax,%edi C ... since they are offset ...
+ subl %eax,%esi C ... by a constant when we ...
+ subl %eax,%edx C ... enter the loop
+ shrl $2,%eax C restore previous value
+
+ifdef(`PIC',`
+ C Calculate start address in loop for PIC. Due to limitations in
+ C some assemblers, L(oop)-L(0b)-3 cannot be put into the leal
+ call L(0b)
+L(0b): leal (%eax,%eax,8),%eax
+ addl (%esp),%eax
+ addl $L(oop)-L(0b)-3,%eax
+ addl $4,%esp
+',`
+ C Calculate start address in loop for non-PIC.
+ leal L(oop)-3(%eax,%eax,8),%eax
+')
+ jmp *%eax C jump into loop
+
+L(oopgo):
+ pushl %ebp FRAME_pushl()
+ movl PARAM_CARRY,%ebp
+ shrl $1,%ebp C shift bit 0 into carry
+ popl %ebp FRAME_popl()
+
+ ALIGN(16)
+L(oop): movl (%esi),%eax
+ M4_inst (%edx),%eax
+ movl %eax,(%edi)
+ movl 4(%esi),%eax
+ M4_inst 4(%edx),%eax
+ movl %eax,4(%edi)
+ movl 8(%esi),%eax
+ M4_inst 8(%edx),%eax
+ movl %eax,8(%edi)
+ movl 12(%esi),%eax
+ M4_inst 12(%edx),%eax
+ movl %eax,12(%edi)
+ movl 16(%esi),%eax
+ M4_inst 16(%edx),%eax
+ movl %eax,16(%edi)
+ movl 20(%esi),%eax
+ M4_inst 20(%edx),%eax
+ movl %eax,20(%edi)
+ movl 24(%esi),%eax
+ M4_inst 24(%edx),%eax
+ movl %eax,24(%edi)
+ movl 28(%esi),%eax
+ M4_inst 28(%edx),%eax
+ movl %eax,28(%edi)
+ leal 32(%edi),%edi
+ leal 32(%esi),%esi
+ leal 32(%edx),%edx
+ decl %ecx
+ jnz L(oop)
+
+ sbbl %eax,%eax
+ negl %eax
+
+ popl %esi
+ popl %edi
+ ret
+
+EPILOGUE()
projects / msp430-gcc.git / blobdiff