354 lines
8.6 KiB
NASM
354 lines
8.6 KiB
NASM
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; Copyright 2001 Free Software Foundation, Inc.
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;
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; This file is part of the GNU MP Library.
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;
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; The GNU MP Library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public License as
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; published by the Free Software Foundation; either version 2.1 of the
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; License, or (at your option) any later version.
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;
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; The GNU MP Library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with the GNU MP Library; see the file COPYING.LIB. If
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; not, write to the Free Software Foundation, Inc., 59 Temple Place -
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; Suite 330, Boston, MA 02111-1307, USA.
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;
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; Translation of AT&T syntax code by Brian Gladman
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%include "..\x86i.inc"
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%define PARAM_SHIFT esp+frame+16
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%define PARAM_SIZE esp+frame+12
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%define PARAM_SRC esp+frame+8
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%define PARAM_DST esp+frame+4
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%define frame 8
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; minimum 5,because the unrolled loop can't handle less
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%define UNROLL_THRESHOLD 5
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section .text
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global ___gmpn_lshift
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%ifdef DLL
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export ___gmpn_lshift
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%endif
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align 8
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___gmpn_lshift:
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push ebx
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push edi
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mov eax,[PARAM_SIZE]
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mov edx,[PARAM_DST]
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mov ebx,[PARAM_SRC]
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mov ecx,[PARAM_SHIFT]
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cmp eax,UNROLL_THRESHOLD
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jae Lunroll
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mov edi,[-4+ebx+eax*4] ; src high limb
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dec eax
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jnz Lsimple
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shld eax,edi,cl
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shl edi,cl
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mov [edx],edi ; dst low limb
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pop edi ; risk of data cache bank clash
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pop ebx
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ret
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; eax size-1
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; ebx src
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; ecx shift
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; edx dst
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; esi
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; edi
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; ebp
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Lsimple:
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movd mm5,[ebx+eax*4] ; src high limb
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movd mm6,ecx ; lshift
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neg ecx
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psllq mm5,mm6
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add ecx,32
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movd mm7,ecx
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psrlq mm5,32 ; retval
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; eax counter,limbs,negative
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; ebx src
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; ecx
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; edx dst
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; esi
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; edi
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;
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; mm0 scratch
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; mm5 return value
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; mm6 shift
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; mm7 32-shift
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Lsimple_top:
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movq mm0,[ebx+eax*4-4]
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dec eax
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psrlq mm0,mm7
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movd [4+edx+eax*4],mm0
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jnz Lsimple_top
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movd mm0,[ebx]
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movd eax,mm5
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psllq mm0,mm6
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pop edi
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pop ebx
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movd [edx],mm0
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emms
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ret
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; eax size
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; ebx src
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; ecx shift
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; edx dst
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; esi
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; edi
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; ebp
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align 8
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Lunroll:
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movd mm5,[ebx+eax*4-4] ; src high limb
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lea edi,[ebx+eax*4]
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movd mm6,ecx ; lshift
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and edi,4
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psllq mm5,mm6
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jz Lstart_src_aligned
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; src isn't aligned,process high limb separately (marked xxx) to
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; make it so.
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;
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; source -8(ebx,%eax,4)
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; |
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; +-------+-------+-------+--
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; | |
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; +-------+-------+-------+--
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; 0mod8 4mod8 0mod8
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;
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; dest
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; -4(edx,%eax,4)
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; |
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; +-------+-------+--
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; | xxx | |
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; +-------+-------+--
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movq mm0,[ebx+eax*4-8] ; unaligned load
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psllq mm0,mm6
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dec eax
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psrlq mm0,32
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movd [edx+eax*4],mm0
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Lstart_src_aligned:
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movq mm1,[ebx+eax*4-8] ; src high qword
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lea edi,[edx+eax*4]
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and edi,4
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psrlq mm5,32 ; return value
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movq mm3,[ebx+eax*4-16] ; src second highest qword
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jz Lstart_dst_aligned
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; dst isn't aligned,subtract 4 to make it so,and pretend the shift
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; is 32 bits extra. High limb of dst (marked xxx) handled here
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; separately.
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;
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; source -8(ebx,%eax,4)
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; |
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; +-------+-------+--
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; | mm1 |
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; +-------+-------+--
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; 0mod8 4mod8
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;
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; dest
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; -4(edx,%eax,4)
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; |
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; +-------+-------+-------+--
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; | xxx | |
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; +-------+-------+-------+--
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; 0mod8 4mod8 0mod8
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movq mm0,mm1
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add ecx,32 ; new shift
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psllq mm0,mm6
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movd mm6,ecx
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psrlq mm0,32
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; wasted cycle here waiting for %mm0
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movd [-4+edx+eax*4],mm0
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sub edx,4
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Lstart_dst_aligned:
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psllq mm1,mm6
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neg ecx ; -shift
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add ecx,64 ; 64-shift
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movq mm2,mm3
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movd mm7,ecx
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sub eax,8 ; size-8
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psrlq mm3,mm7
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por mm3,mm1 ; mm3 ready to store
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jc Lfinish
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; The comments in mpn_rshift apply here too.
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; eax counter,limbs
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; ebx src
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; ecx
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; edx dst
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; esi
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; edi
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;
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; mm0
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; mm1
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; mm2 src qword from 16(%ebx,%eax,4)
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; mm3 dst qword ready to store to 24(%edx,%eax,4)
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;
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; mm5 return value
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; mm6 lshift
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; mm7 rshift
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align 8
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Lunroll_loop:
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movq mm0,[ebx+eax*4+8]
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psllq mm2,mm6
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movq mm1,mm0
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psrlq mm0,mm7
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movq [24+edx+eax*4],mm3
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por mm0,mm2
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movq mm3,[ebx+eax*4]
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psllq mm1,mm6
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movq [16+edx+eax*4],mm0
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movq mm2,mm3
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psrlq mm3,mm7
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sub eax,4
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por mm3,mm1
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jnc Lunroll_loop
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Lfinish:
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; eax -4 to -1 representing respectively 0 to 3 limbs remaining
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test al,2
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jz Lfinish_no_two
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movq mm0,[ebx+eax*4+8]
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psllq mm2,mm6
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movq mm1,mm0
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psrlq mm0,mm7
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movq [24+edx+eax*4],mm3 ; prev
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por mm0,mm2
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movq mm2,mm1
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movq mm3,mm0
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sub eax,2
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Lfinish_no_two:
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; eax -4 or -3 representing respectively 0 or 1 limbs remaining
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; mm2 src prev qword,from 16(%ebx,%eax,4)
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; mm3 dst qword,for 24(%edx,%eax,4)
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test al,1
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movd eax,mm5 ; retval
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pop edi
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jz Lfinish_zero
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; One extra src limb,destination was aligned.
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;
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; source ebx
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; --+---------------+-------+
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; | mm2 | |
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; --+---------------+-------+
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;
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; dest edx+12 edx+4 edx
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; --+---------------+---------------+-------+
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; | mm3 | | |
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; --+---------------+---------------+-------+
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;
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; mm6 = shift
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; mm7 = ecx = 64-shift
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; One extra src limb,destination was unaligned.
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;
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; source ebx
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; --+---------------+-------+
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; | mm2 | |
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; --+---------------+-------+
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;
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; dest edx+12 edx+4
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; --+---------------+---------------+
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; | mm3 | |
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; --+---------------+---------------+
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;
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; mm6 = shift+32
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; mm7 = ecx = 64-(shift+32)
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; In both cases there's one extra limb of src to fetch and combine
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; with mm2 to make a qword at 4(%edx),and in the aligned case
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; there's an extra limb of dst to be formed from that extra src limb
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; left shifted.
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movd mm0,[ebx]
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psllq mm2,mm6
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movq [12+edx],mm3
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psllq mm0,32
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movq mm1,mm0
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psrlq mm0,mm7
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por mm0,mm2
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psllq mm1,mm6
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movq [4+edx],mm0
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psrlq mm1,32
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and ecx,32
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pop ebx
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jz Lfinish_one_unaligned
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movd [edx],mm1
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Lfinish_one_unaligned:
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emms
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ret
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Lfinish_zero:
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; No extra src limbs,destination was aligned.
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;
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; source ebx
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; --+---------------+
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; | mm2 |
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; --+---------------+
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;
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; dest edx+8 edx
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; --+---------------+---------------+
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; | mm3 | |
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; --+---------------+---------------+
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;
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; mm6 = shift
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; mm7 = ecx = 64-shift
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; No extra src limbs,destination was unaligned.
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;
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; source ebx
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; --+---------------+
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; | mm2 |
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; --+---------------+
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;
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; dest edx+8 edx+4
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; --+---------------+-------+
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; | mm3 | |
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; --+---------------+-------+
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;
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; mm6 = shift+32
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; mm7 = ecx = 64-(shift+32)
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; The movd for the unaligned case writes the same data to 4(%edx)
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; that the movq does for the aligned case.
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movq [8+edx],mm3
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and ecx,32
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psllq mm2,mm6
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jz Lfinish_zero_unaligned
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movq [edx],mm2
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Lfinish_zero_unaligned:
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psrlq mm2,32
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pop ebx
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movd eax,mm5 ; retval
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movd [4+edx],mm2
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emms
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ret
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end
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