aorsmul_1.asm
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上传日期:2022-08-06
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- dnl Intel P6 mpn_addmul_1/mpn_submul_1 -- add or subtract mpn multiple.
- dnl Copyright 1999, 2000, 2001, 2002, 2005 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 cycles/limb
- C P5:
- C P6 model 0-8,10-12) 6.44
- C P6 model 9 (Banias)
- C P6 model 13 (Dothan) 6.11
- C P4 model 0 (Willamette)
- C P4 model 1 (?)
- C P4 model 2 (Northwood)
- C P4 model 3 (Prescott)
- C P4 model 4 (Nocona)
- C K6:
- C K7:
- C K8:
- dnl P6 UNROLL_COUNT cycles/limb
- dnl 8 6.7
- dnl 16 6.35
- dnl 32 6.3
- dnl 64 6.3
- dnl Maximum possible with the current code is 64.
- deflit(UNROLL_COUNT, 16)
- ifdef(`OPERATION_addmul_1', `
- define(M4_inst, addl)
- define(M4_function_1, mpn_addmul_1)
- define(M4_function_1c, mpn_addmul_1c)
- define(M4_description, add it to)
- define(M4_desc_retval, carry)
- ',`ifdef(`OPERATION_submul_1', `
- define(M4_inst, subl)
- define(M4_function_1, mpn_submul_1)
- define(M4_function_1c, mpn_submul_1c)
- define(M4_description, subtract it from)
- define(M4_desc_retval, borrow)
- ',`m4_error(`Need OPERATION_addmul_1 or OPERATION_submul_1
- ')')')
- MULFUNC_PROLOGUE(mpn_addmul_1 mpn_addmul_1c mpn_submul_1 mpn_submul_1c)
- C mp_limb_t M4_function_1 (mp_ptr dst, mp_srcptr src, mp_size_t size,
- C mp_limb_t mult);
- C mp_limb_t M4_function_1c (mp_ptr dst, mp_srcptr src, mp_size_t size,
- C mp_limb_t mult, mp_limb_t carry);
- C
- C Calculate src,size multiplied by mult and M4_description dst,size.
- C Return the M4_desc_retval limb from the top of the result.
- C
- C This code is pretty much the same as the K6 code. The unrolled loop is
- C the same, but there's just a few scheduling tweaks in the setups and the
- C simple loop.
- C
- C A number of variations have been tried for the unrolled loop, with one or
- C two carries, and with loads scheduled earlier, but nothing faster than 6
- C cycles/limb has been found.
- ifdef(`PIC',`
- deflit(UNROLL_THRESHOLD, 5)
- ',`
- deflit(UNROLL_THRESHOLD, 5)
- ')
- defframe(PARAM_CARRY, 20)
- defframe(PARAM_MULTIPLIER,16)
- defframe(PARAM_SIZE, 12)
- defframe(PARAM_SRC, 8)
- defframe(PARAM_DST, 4)
- TEXT
- ALIGN(32)
- PROLOGUE(M4_function_1c)
- pushl %ebx
- deflit(`FRAME',4)
- movl PARAM_CARRY, %ebx
- jmp L(start_nc)
- EPILOGUE()
- PROLOGUE(M4_function_1)
- push %ebx
- deflit(`FRAME',4)
- xorl %ebx, %ebx C initial carry
- L(start_nc):
- movl PARAM_SIZE, %ecx
- pushl %esi
- deflit(`FRAME',8)
- movl PARAM_SRC, %esi
- pushl %edi
- deflit(`FRAME',12)
- movl PARAM_DST, %edi
- pushl %ebp
- deflit(`FRAME',16)
- cmpl $UNROLL_THRESHOLD, %ecx
- movl PARAM_MULTIPLIER, %ebp
- jae L(unroll)
- C simple loop
- C this is offset 0x22, so close enough to aligned
- L(simple):
- C eax scratch
- C ebx carry
- C ecx counter
- C edx scratch
- C esi src
- C edi dst
- C ebp multiplier
- movl (%esi), %eax
- addl $4, %edi
- mull %ebp
- addl %ebx, %eax
- adcl $0, %edx
- M4_inst %eax, -4(%edi)
- movl %edx, %ebx
- adcl $0, %ebx
- decl %ecx
- leal 4(%esi), %esi
- jnz L(simple)
- popl %ebp
- popl %edi
- popl %esi
- movl %ebx, %eax
- popl %ebx
- ret
- C------------------------------------------------------------------------------
- C VAR_JUMP holds the computed jump temporarily because there's not enough
- C registers when doing the mul for the initial two carry limbs.
- C
- C The add/adc for the initial carry in %ebx is necessary only for the
- C mpn_add/submul_1c entry points. Duplicating the startup code to
- C eliminate this for the plain mpn_add/submul_1 doesn't seem like a good
- C idea.
- dnl overlapping with parameters already fetched
- define(VAR_COUNTER,`PARAM_SIZE')
- define(VAR_JUMP, `PARAM_DST')
- C this is offset 0x43, so close enough to aligned
- L(unroll):
- C eax
- C ebx initial carry
- C ecx size
- C edx
- C esi src
- C edi dst
- C ebp
- movl %ecx, %edx
- decl %ecx
- subl $2, %edx
- negl %ecx
- shrl $UNROLL_LOG2, %edx
- andl $UNROLL_MASK, %ecx
- movl %edx, VAR_COUNTER
- movl %ecx, %edx
- C 15 code bytes per limb
- ifdef(`PIC',`
- call L(pic_calc)
- L(here):
- ',`
- shll $4, %edx
- negl %ecx
- leal L(entry) (%edx,%ecx,1), %edx
- ')
- movl (%esi), %eax C src low limb
- movl %edx, VAR_JUMP
- leal ifelse(UNROLL_BYTES,256,128+) 4(%esi,%ecx,4), %esi
- mull %ebp
- addl %ebx, %eax C initial carry (from _1c)
- adcl $0, %edx
- movl %edx, %ebx C high carry
- leal ifelse(UNROLL_BYTES,256,128) (%edi,%ecx,4), %edi
- movl VAR_JUMP, %edx
- testl $1, %ecx
- movl %eax, %ecx C low carry
- cmovnz( %ebx, %ecx) C high,low carry other way around
- cmovnz( %eax, %ebx)
- jmp *%edx
- ifdef(`PIC',`
- L(pic_calc):
- shll $4, %edx
- negl %ecx
- C See mpn/x86/README about old gas bugs
- leal (%edx,%ecx,1), %edx
- addl $L(entry)-L(here), %edx
- addl (%esp), %edx
- ret_internal
- ')
- C -----------------------------------------------------------
- ALIGN(32)
- L(top):
- deflit(`FRAME',16)
- C eax scratch
- C ebx carry hi
- C ecx carry lo
- C edx scratch
- C esi src
- C edi dst
- C ebp multiplier
- C
- C VAR_COUNTER loop counter
- C
- C 15 code bytes per limb
- addl $UNROLL_BYTES, %edi
- L(entry):
- deflit(CHUNK_COUNT,2)
- forloop(`i', 0, UNROLL_COUNT/CHUNK_COUNT-1, `
- deflit(`disp0', eval(i*4*CHUNK_COUNT ifelse(UNROLL_BYTES,256,-128)))
- deflit(`disp1', eval(disp0 + 4))
- Zdisp( movl, disp0,(%esi), %eax)
- mull %ebp
- Zdisp( M4_inst,%ecx, disp0,(%edi))
- adcl %eax, %ebx
- movl %edx, %ecx
- adcl $0, %ecx
- movl disp1(%esi), %eax
- mull %ebp
- M4_inst %ebx, disp1(%edi)
- adcl %eax, %ecx
- movl %edx, %ebx
- adcl $0, %ebx
- ')
- decl VAR_COUNTER
- leal UNROLL_BYTES(%esi), %esi
- jns L(top)
- deflit(`disp0', eval(UNROLL_BYTES ifelse(UNROLL_BYTES,256,-128)))
- M4_inst %ecx, disp0(%edi)
- movl %ebx, %eax
- popl %ebp
- popl %edi
- popl %esi
- popl %ebx
- adcl $0, %eax
- ret
- EPILOGUE()