251 lines
5.5 KiB
NASM
251 lines
5.5 KiB
NASM
dnl AMD K7 mpn_add_n/mpn_sub_n -- mpn add or subtract.
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dnl Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C K7: 1.64 cycles/limb (at 16 limbs/loop).
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dnl K7: UNROLL_COUNT cycles/limb
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dnl 8 1.9
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dnl 16 1.64
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dnl 32 1.7
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dnl 64 2.0
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dnl Maximum possible with the current code is 64.
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deflit(UNROLL_COUNT, 16)
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define(OPERATION_sub_n,1)
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ifdef(`OPERATION_add_n', `
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define(M4_inst, adcl)
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define(M4_function_n, mpn_add_n)
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define(M4_function_nc, mpn_add_nc)
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define(M4_description, add)
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',`ifdef(`OPERATION_sub_n', `
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define(M4_inst, sbbl)
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define(M4_function_n, mpn_sub_n)
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define(M4_function_nc, mpn_sub_nc)
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define(M4_description, subtract)
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',`m4_error(`Need OPERATION_add_n or OPERATION_sub_n
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')')')
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MULFUNC_PROLOGUE(mpn_sub_n mpn_sub_nc)
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C mp_limb_t M4_function_n (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
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C mp_size_t size);
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C mp_limb_t M4_function_nc (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
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C mp_size_t size, mp_limb_t carry);
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C
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C Calculate src1,size M4_description src2,size, and store the result in
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C dst,size. The return value is the carry bit from the top of the result (1
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C or 0).
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C
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C The _nc version accepts 1 or 0 for an initial carry into the low limb of
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C the calculation. Note values other than 1 or 0 here will lead to garbage
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C results.
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C
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C This code runs at 1.64 cycles/limb, which might be the best possible with
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C plain integer operations. Each limb is 2 loads and 1 store, any 2 of
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C which can be done each cycle, leading to 1.5 c/l.
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dnl Must have UNROLL_THRESHOLD >= 2, since the unrolled loop can't handle 1.
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ifdef(`PIC',`
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deflit(UNROLL_THRESHOLD, 8)
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',`
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deflit(UNROLL_THRESHOLD, 8)
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')
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defframe(PARAM_CARRY,20)
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defframe(PARAM_SIZE, 16)
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defframe(PARAM_SRC2, 12)
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defframe(PARAM_SRC1, 8)
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defframe(PARAM_DST, 4)
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defframe(SAVE_EBP, -4)
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defframe(SAVE_ESI, -8)
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defframe(SAVE_EBX, -12)
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defframe(SAVE_EDI, -16)
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deflit(STACK_SPACE, 16)
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TEXT
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ALIGN(32)
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deflit(`FRAME',0)
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PROLOGUE(M4_function_nc)
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movl PARAM_CARRY, %eax
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jmp L(start)
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EPILOGUE()
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PROLOGUE(M4_function_n)
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xorl %eax, %eax C carry
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L(start):
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movl PARAM_SIZE, %ecx
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subl $STACK_SPACE, %esp
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deflit(`FRAME',STACK_SPACE)
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movl %edi, SAVE_EDI
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movl %ebx, SAVE_EBX
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cmpl $UNROLL_THRESHOLD, %ecx
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movl PARAM_SRC2, %edx
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movl PARAM_SRC1, %ebx
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jae L(unroll)
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movl PARAM_DST, %edi
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leal (%ebx,%ecx,4), %ebx
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leal (%edx,%ecx,4), %edx
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leal (%edi,%ecx,4), %edi
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negl %ecx
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shrl %eax
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C This loop in in a single 16 byte code block already, so no
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C alignment necessary.
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L(simple):
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C eax scratch
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C ebx src1
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C ecx counter
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C edx src2
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C esi
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C edi dst
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C ebp
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movl (%ebx,%ecx,4), %eax
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M4_inst (%edx,%ecx,4), %eax
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movl %eax, (%edi,%ecx,4)
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incl %ecx
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jnz L(simple)
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movl $0, %eax
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movl SAVE_EDI, %edi
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movl SAVE_EBX, %ebx
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setc %al
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addl $STACK_SPACE, %esp
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ret
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C -----------------------------------------------------------------------------
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C This is at 0x55, close enough to aligned.
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L(unroll):
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deflit(`FRAME',STACK_SPACE)
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movl %ebp, SAVE_EBP
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andl $-2, %ecx C size low bit masked out
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andl $1, PARAM_SIZE C size low bit kept
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movl %ecx, %edi
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decl %ecx
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movl PARAM_DST, %ebp
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shrl $UNROLL_LOG2, %ecx
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negl %edi
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movl %esi, SAVE_ESI
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andl $UNROLL_MASK, %edi
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ifdef(`PIC',`
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call L(pic_calc)
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L(here):
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',`
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leal L(entry) (%edi,%edi,8), %esi C 9 bytes per
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')
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negl %edi
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shrl %eax
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leal ifelse(UNROLL_BYTES,256,128) (%ebx,%edi,4), %ebx
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leal ifelse(UNROLL_BYTES,256,128) (%edx,%edi,4), %edx
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leal ifelse(UNROLL_BYTES,256,128) (%ebp,%edi,4), %edi
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jmp *%esi
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ifdef(`PIC',`
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L(pic_calc):
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C See mpn/x86/README about old gas bugs
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leal (%edi,%edi,8), %esi
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addl $L(entry)-L(here), %esi
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addl (%esp), %esi
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ret_internal
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')
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C -----------------------------------------------------------------------------
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ALIGN(32)
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L(top):
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C eax zero
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C ebx src1
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C ecx counter
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C edx src2
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C esi scratch (was computed jump)
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C edi dst
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C ebp scratch
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leal UNROLL_BYTES(%edx), %edx
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L(entry):
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deflit(CHUNK_COUNT, 2)
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forloop(i, 0, UNROLL_COUNT/CHUNK_COUNT-1, `
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deflit(`disp0', eval(i*CHUNK_COUNT*4 ifelse(UNROLL_BYTES,256,-128)))
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deflit(`disp1', eval(disp0 + 4))
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Zdisp( movl, disp0,(%ebx), %esi)
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movl disp1(%ebx), %ebp
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Zdisp( M4_inst,disp0,(%edx), %esi)
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Zdisp( movl, %esi, disp0,(%edi))
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M4_inst disp1(%edx), %ebp
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movl %ebp, disp1(%edi)
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')
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decl %ecx
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leal UNROLL_BYTES(%ebx), %ebx
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leal UNROLL_BYTES(%edi), %edi
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jns L(top)
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mov PARAM_SIZE, %esi
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movl SAVE_EBP, %ebp
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movl $0, %eax
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decl %esi
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js L(even)
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movl (%ebx), %ecx
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M4_inst UNROLL_BYTES(%edx), %ecx
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movl %ecx, (%edi)
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L(even):
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movl SAVE_EDI, %edi
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movl SAVE_EBX, %ebx
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setc %al
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movl SAVE_ESI, %esi
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addl $STACK_SPACE, %esp
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ret
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EPILOGUE()
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