[project @ 2000-08-18 15:44:28 by simonmar]

[ghc-hetmet.git] / ghc / rts / gmp / mpn / x86 / k6 / mmx / com_n.asm

diff --git a/ghc/rts/gmp/mpn/x86/k6/mmx/com_n.asm b/ghc/rts/gmp/mpn/x86/k6/mmx/com_n.asm
new file mode 100644 (file)
index 0000000..8915080
--- /dev/null
+++ b/ghc/rts/gmp/mpn/x86/k6/mmx/com_n.asm
@@ -0,0 +1,91 @@
+dnl  AMD K6-2 mpn_com_n -- mpn bitwise one's complement.
+dnl   
+dnl     alignment dst/src, A=0mod8 N=4mod8
+dnl        A/A   A/N   N/A   N/N
+dnl  K6-2  1.0   1.18  1.18  1.18  cycles/limb
+dnl  K6    1.5   1.85  1.75  1.85
+
+
+dnl  Copyright (C) 1999, 2000 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 2.1 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
+dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
+dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
+dnl  Suite 330, Boston, MA 02111-1307, USA.
+
+
+include(`../config.m4')
+
+
+C void mpn_com_n (mp_ptr dst, mp_srcptr src, mp_size_t size);
+C
+C Take the bitwise ones-complement of src,size and write it to dst,size.
+
+defframe(PARAM_SIZE,12)
+defframe(PARAM_SRC, 8)
+defframe(PARAM_DST, 4)
+
+       .text
+       ALIGN(32)
+PROLOGUE(mpn_com_n)
+deflit(`FRAME',0)
+
+       movl    PARAM_SIZE, %ecx
+       movl    PARAM_SRC, %eax
+       movl    PARAM_DST, %edx
+       shrl    %ecx
+       jnz     L(two_or_more)
+
+       movl    (%eax), %eax
+       notl    %eax
+       movl    %eax, (%edx)
+       ret
+
+
+L(two_or_more):
+       pushl   %ebx
+FRAME_pushl()
+       movl    %ecx, %ebx
+
+       pcmpeqd %mm7, %mm7      C all ones
+
+
+       ALIGN(16)
+L(top):
+       C eax   src
+       C ebx   floor(size/2)
+       C ecx   counter
+       C edx   dst
+       C esi
+       C edi
+       C ebp
+
+       movq    -8(%eax,%ecx,8), %mm0
+       pxor    %mm7, %mm0
+       movq    %mm0, -8(%edx,%ecx,8)
+       loop    L(top)
+
+
+       jnc     L(no_extra)
+       movl    (%eax,%ebx,8), %eax
+       notl    %eax
+       movl    %eax, (%edx,%ebx,8)
+L(no_extra):
+
+       popl    %ebx
+       emms_or_femms
+       ret
+
+EPILOGUE()