aors_n.asm
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上传日期:2022-08-06
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- dnl AMD K6 mpn_add/sub_n -- mpn addition or subtraction.
- dnl Copyright 1999, 2000, 2001, 2002 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 K6: normal 3.25 cycles/limb, in-place 2.75 cycles/limb.
- 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
- C (1 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 Instruction decoding limits a normal dst=src1+src2 operation to 3 c/l, and
- C an in-place dst+=src to 2.5 c/l. The unrolled loops have 1 cycle/loop of
- C loop control, which with 4 limbs/loop means an extra 0.25 c/l.
- define(PARAM_CARRY, `FRAME+20(%esp)')
- define(PARAM_SIZE, `FRAME+16(%esp)')
- define(PARAM_SRC2, `FRAME+12(%esp)')
- define(PARAM_SRC1, `FRAME+8(%esp)')
- define(PARAM_DST, `FRAME+4(%esp)')
- deflit(`FRAME',0)
- dnl minimum 5 because the unrolled code can't handle less
- deflit(UNROLL_THRESHOLD, 5)
- TEXT
- ALIGN(32)
- PROLOGUE(M4_function_nc)
- movl PARAM_CARRY, %eax
- jmp L(start)
- EPILOGUE()
- PROLOGUE(M4_function_n)
- xorl %eax, %eax
- L(start):
- movl PARAM_SIZE, %ecx
- pushl %ebx
- FRAME_pushl()
- movl PARAM_SRC1, %ebx
- pushl %edi
- FRAME_pushl()
- movl PARAM_SRC2, %edx
- cmpl $UNROLL_THRESHOLD, %ecx
- movl PARAM_DST, %edi
- jae L(unroll)
- shrl %eax C initial carry flag
- C offset 0x21 here, close enough to aligned
- L(simple):
- C eax scratch
- C ebx src1
- C ecx counter
- C edx src2
- C esi
- C edi dst
- C ebp
- C
- C The store to (%edi) could be done with a stosl; it'd be smaller
- C code, but there's no speed gain and a cld would have to be added
- C (per mpn/x86/README).
- movl (%ebx), %eax
- leal 4(%ebx), %ebx
- M4_inst (%edx), %eax
- movl %eax, (%edi)
- leal 4(%edi), %edi
- leal 4(%edx), %edx
- loop L(simple)
- movl $0, %eax
- popl %edi
- setc %al
- popl %ebx
- ret
- C -----------------------------------------------------------------------------
- L(unroll):
- C eax carry
- C ebx src1
- C ecx counter
- C edx src2
- C esi
- C edi dst
- C ebp
- cmpl %edi, %ebx
- pushl %esi
- je L(inplace)
- ifdef(`OPERATION_add_n',`
- cmpl %edi, %edx
- je L(inplace_reverse)
- ')
- movl %ecx, %esi
- andl $-4, %ecx
- andl $3, %esi
- leal (%ebx,%ecx,4), %ebx
- leal (%edx,%ecx,4), %edx
- leal (%edi,%ecx,4), %edi
- negl %ecx
- shrl %eax
- ALIGN(32)
- L(normal_top):
- C eax counter, qwords, negative
- C ebx src1
- C ecx scratch
- C edx src2
- C esi
- C edi dst
- C ebp
- movl (%ebx,%ecx,4), %eax
- leal 5(%ecx), %ecx
- M4_inst -20(%edx,%ecx,4), %eax
- movl %eax, -20(%edi,%ecx,4)
- movl 4-20(%ebx,%ecx,4), %eax
- M4_inst 4-20(%edx,%ecx,4), %eax
- movl %eax, 4-20(%edi,%ecx,4)
- movl 8-20(%ebx,%ecx,4), %eax
- M4_inst 8-20(%edx,%ecx,4), %eax
- movl %eax, 8-20(%edi,%ecx,4)
- movl 12-20(%ebx,%ecx,4), %eax
- M4_inst 12-20(%edx,%ecx,4), %eax
- movl %eax, 12-20(%edi,%ecx,4)
- loop L(normal_top)
- decl %esi
- jz L(normal_finish_one)
- js L(normal_done)
- C two or three more limbs
- movl (%ebx), %eax
- M4_inst (%edx), %eax
- movl %eax, (%edi)
- movl 4(%ebx), %eax
- M4_inst 4(%edx), %eax
- decl %esi
- movl %eax, 4(%edi)
- jz L(normal_done)
- movl $2, %ecx
- L(normal_finish_one):
- movl (%ebx,%ecx,4), %eax
- M4_inst (%edx,%ecx,4), %eax
- movl %eax, (%edi,%ecx,4)
- L(normal_done):
- popl %esi
- popl %edi
- movl $0, %eax
- popl %ebx
- setc %al
- ret
- C -----------------------------------------------------------------------------
- ifdef(`OPERATION_add_n',`
- L(inplace_reverse):
- C dst==src2
- movl %ebx, %edx
- ')
- L(inplace):
- C eax initial carry
- C ebx
- C ecx size
- C edx src
- C esi
- C edi dst
- C ebp
- leal -1(%ecx), %esi
- decl %ecx
- andl $-4, %ecx
- andl $3, %esi
- movl (%edx), %ebx C src low limb
- leal (%edx,%ecx,4), %edx
- leal (%edi,%ecx,4), %edi
- negl %ecx
- shrl %eax
- ALIGN(32)
- L(inplace_top):
- C eax
- C ebx next src limb
- C ecx size
- C edx src
- C esi
- C edi dst
- C ebp
- M4_inst %ebx, (%edi,%ecx,4)
- movl 4(%edx,%ecx,4), %eax
- leal 5(%ecx), %ecx
- M4_inst %eax, 4-20(%edi,%ecx,4)
- movl 8-20(%edx,%ecx,4), %eax
- movl 12-20(%edx,%ecx,4), %ebx
- M4_inst %eax, 8-20(%edi,%ecx,4)
- M4_inst %ebx, 12-20(%edi,%ecx,4)
- movl 16-20(%edx,%ecx,4), %ebx
- loop L(inplace_top)
- C now %esi is 0 to 3 representing respectively 1 to 4 limbs more
- M4_inst %ebx, (%edi)
- decl %esi
- jz L(inplace_finish_one)
- js L(inplace_done)
- C two or three more limbs
- movl 4(%edx), %eax
- movl 8(%edx), %ebx
- M4_inst %eax, 4(%edi)
- M4_inst %ebx, 8(%edi)
- decl %esi
- movl $2, %ecx
- jz L(normal_done)
- L(inplace_finish_one):
- movl 4(%edx,%ecx,4), %eax
- M4_inst %eax, 4(%edi,%ecx,4)
- L(inplace_done):
- popl %esi
- popl %edi
- movl $0, %eax
- popl %ebx
- setc %al
- ret
- EPILOGUE()