aors_n.asm
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上传日期:2022-08-06
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- dnl AMD K7 mpn_add_n/mpn_sub_n -- mpn add or subtract.
- dnl Copyright 1999, 2000, 2001, 2002, 2003 Free Software 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 K7: 1.64 cycles/limb (at 16 limbs/loop).
- dnl K7: UNROLL_COUNT cycles/limb
- dnl 8 1.9
- dnl 16 1.64
- dnl 32 1.7
- dnl 64 2.0
- dnl Maximum possible with the current code is 64.
- deflit(UNROLL_COUNT, 16)
- ifdef(`OPERATION_add_n', `
- define(M4_inst, adcl)
- define(M4_function_n, mpn_add_n)
- define(M4_function_nc, mpn_add_nc)
- define(M4_description, add)
- ',`ifdef(`OPERATION_sub_n', `
- define(M4_inst, sbbl)
- define(M4_function_n, mpn_sub_n)
- define(M4_function_nc, mpn_sub_nc)
- define(M4_description, subtract)
- ',`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);
- C
- C Calculate src1,size M4_description src2,size, and store the result in
- C dst,size. The return value is the carry bit from the top of the result (1
- C or 0).
- C
- C The _nc version accepts 1 or 0 for an initial carry into the low limb of
- C the calculation. Note values other than 1 or 0 here will lead to garbage
- C results.
- C
- C This code runs at 1.64 cycles/limb, which might be the best possible with
- C plain integer operations. Each limb is 2 loads and 1 store, any 2 of
- C which can be done each cycle, leading to 1.5 c/l.
- dnl Must have UNROLL_THRESHOLD >= 2, since the unrolled loop can't handle 1.
- ifdef(`PIC',`
- deflit(UNROLL_THRESHOLD, 8)
- ',`
- deflit(UNROLL_THRESHOLD, 8)
- ')
- defframe(PARAM_CARRY,20)
- defframe(PARAM_SIZE, 16)
- defframe(PARAM_SRC2, 12)
- defframe(PARAM_SRC1, 8)
- defframe(PARAM_DST, 4)
- defframe(SAVE_EBP, -4)
- defframe(SAVE_ESI, -8)
- defframe(SAVE_EBX, -12)
- defframe(SAVE_EDI, -16)
- deflit(STACK_SPACE, 16)
- TEXT
- ALIGN(32)
- deflit(`FRAME',0)
- PROLOGUE(M4_function_nc)
- movl PARAM_CARRY, %eax
- jmp L(start)
- EPILOGUE()
- PROLOGUE(M4_function_n)
- xorl %eax, %eax C carry
- L(start):
- movl PARAM_SIZE, %ecx
- subl $STACK_SPACE, %esp
- deflit(`FRAME',STACK_SPACE)
- movl %edi, SAVE_EDI
- movl %ebx, SAVE_EBX
- cmpl $UNROLL_THRESHOLD, %ecx
- movl PARAM_SRC2, %edx
- movl PARAM_SRC1, %ebx
- jae L(unroll)
- movl PARAM_DST, %edi
- leal (%ebx,%ecx,4), %ebx
- leal (%edx,%ecx,4), %edx
- leal (%edi,%ecx,4), %edi
- negl %ecx
- shrl %eax
- C This loop in in a single 16 byte code block already, so no
- C alignment necessary.
- L(simple):
- C eax scratch
- C ebx src1
- C ecx counter
- C edx src2
- C esi
- C edi dst
- C ebp
- movl (%ebx,%ecx,4), %eax
- M4_inst (%edx,%ecx,4), %eax
- movl %eax, (%edi,%ecx,4)
- incl %ecx
- jnz L(simple)
- movl $0, %eax
- movl SAVE_EDI, %edi
- movl SAVE_EBX, %ebx
- setc %al
- addl $STACK_SPACE, %esp
- ret
- C -----------------------------------------------------------------------------
- C This is at 0x55, close enough to aligned.
- L(unroll):
- deflit(`FRAME',STACK_SPACE)
- movl %ebp, SAVE_EBP
- andl $-2, %ecx C size low bit masked out
- andl $1, PARAM_SIZE C size low bit kept
- movl %ecx, %edi
- decl %ecx
- movl PARAM_DST, %ebp
- shrl $UNROLL_LOG2, %ecx
- negl %edi
- movl %esi, SAVE_ESI
- andl $UNROLL_MASK, %edi
- ifdef(`PIC',`
- call L(pic_calc)
- L(here):
- ',`
- leal L(entry) (%edi,%edi,8), %esi C 9 bytes per
- ')
- negl %edi
- shrl %eax
- leal ifelse(UNROLL_BYTES,256,128) (%ebx,%edi,4), %ebx
- leal ifelse(UNROLL_BYTES,256,128) (%edx,%edi,4), %edx
- leal ifelse(UNROLL_BYTES,256,128) (%ebp,%edi,4), %edi
- jmp *%esi
- ifdef(`PIC',`
- L(pic_calc):
- C See mpn/x86/README about old gas bugs
- leal (%edi,%edi,8), %esi
- addl $L(entry)-L(here), %esi
- addl (%esp), %esi
- ret_internal
- ')
- C -----------------------------------------------------------------------------
- ALIGN(32)
- L(top):
- C eax zero
- C ebx src1
- C ecx counter
- C edx src2
- C esi scratch (was computed jump)
- C edi dst
- C ebp scratch
- leal UNROLL_BYTES(%edx), %edx
- L(entry):
- deflit(CHUNK_COUNT, 2)
- forloop(i, 0, UNROLL_COUNT/CHUNK_COUNT-1, `
- deflit(`disp0', eval(i*CHUNK_COUNT*4 ifelse(UNROLL_BYTES,256,-128)))
- deflit(`disp1', eval(disp0 + 4))
- Zdisp( movl, disp0,(%ebx), %esi)
- movl disp1(%ebx), %ebp
- Zdisp( M4_inst,disp0,(%edx), %esi)
- Zdisp( movl, %esi, disp0,(%edi))
- M4_inst disp1(%edx), %ebp
- movl %ebp, disp1(%edi)
- ')
- decl %ecx
- leal UNROLL_BYTES(%ebx), %ebx
- leal UNROLL_BYTES(%edi), %edi
- jns L(top)
- mov PARAM_SIZE, %esi
- movl SAVE_EBP, %ebp
- movl $0, %eax
- decl %esi
- js L(even)
- movl (%ebx), %ecx
- M4_inst UNROLL_BYTES(%edx), %ecx
- movl %ecx, (%edi)
- L(even):
- movl SAVE_EDI, %edi
- movl SAVE_EBX, %ebx
- setc %al
- movl SAVE_ESI, %esi
- addl $STACK_SPACE, %esp
- ret
- EPILOGUE()