--- /dev/null
+dnl Intel Pentium mpn_com_n -- mpn ones complement.
+
+dnl Copyright 1996, 2001, 2002, 2006 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 P5: 1.75 cycles/limb
+
+
+NAILS_SUPPORT(0-31)
+
+
+C void mpn_com_n (mp_ptr dst, mp_srcptr src, mp_size_t size);
+C
+C This code is similar to mpn_copyi, basically there's just some "xorl
+C $GMP_NUMB_MASK"s inserted.
+C
+C Alternatives:
+C
+C On P55 some MMX code could be 1.25 c/l (8 limb unrolled) if src and dst
+C are the same alignment mod 8, but it doesn't seem worth the trouble for
+C just that case (there'd need to be some plain integer available too for
+C the unaligned case).
+
+defframe(PARAM_SIZE,12)
+defframe(PARAM_SRC, 8)
+defframe(PARAM_DST, 4)
+
+ TEXT
+ ALIGN(8)
+PROLOGUE(mpn_com_n)
+deflit(`FRAME',0)
+
+ movl PARAM_SRC, %eax
+ movl PARAM_SIZE, %ecx
+
+ pushl %esi FRAME_pushl()
+ pushl %edi FRAME_pushl()
+
+ leal (%eax,%ecx,4), %eax
+ xorl $-1, %ecx C -size-1
+
+ movl PARAM_DST, %edx
+ addl $8, %ecx C -size+7
+
+ jns L(end)
+
+ movl (%edx), %esi C fetch destination cache line
+ nop
+
+L(top):
+ C eax &src[size]
+ C ebx
+ C ecx counter, limbs, negative
+ C edx dst, incrementing
+ C esi scratch
+ C edi scratch
+ C ebp
+
+ movl 28(%edx), %esi C destination prefetch
+ addl $32, %edx
+
+ movl -28(%eax,%ecx,4), %esi
+ movl -24(%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, -32(%edx)
+ movl %edi, -28(%edx)
+
+ movl -20(%eax,%ecx,4), %esi
+ movl -16(%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, -24(%edx)
+ movl %edi, -20(%edx)
+
+ movl -12(%eax,%ecx,4), %esi
+ movl -8(%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, -16(%edx)
+ movl %edi, -12(%edx)
+
+ movl -4(%eax,%ecx,4), %esi
+ movl (%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, -8(%edx)
+ movl %edi, -4(%edx)
+
+ addl $8, %ecx
+ js L(top)
+
+
+L(end):
+ C eax &src[size]
+ C ecx 0 to 7, representing respectively 7 to 0 limbs remaining
+ C edx dst, next location to store
+
+ subl $4, %ecx
+ nop
+
+ jns L(no4)
+
+ movl -12(%eax,%ecx,4), %esi
+ movl -8(%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, (%edx)
+ movl %edi, 4(%edx)
+
+ movl -4(%eax,%ecx,4), %esi
+ movl (%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, 8(%edx)
+ movl %edi, 12(%edx)
+
+ addl $16, %edx
+ addl $4, %ecx
+L(no4):
+
+ subl $2, %ecx
+ nop
+
+ jns L(no2)
+
+ movl -4(%eax,%ecx,4), %esi
+ movl (%eax,%ecx,4), %edi
+ xorl $GMP_NUMB_MASK, %esi
+ xorl $GMP_NUMB_MASK, %edi
+ movl %esi, (%edx)
+ movl %edi, 4(%edx)
+
+ addl $8, %edx
+ addl $2, %ecx
+L(no2):
+
+ popl %edi
+ jnz L(done)
+
+ movl -4(%eax), %ecx
+
+ xorl $GMP_NUMB_MASK, %ecx
+ popl %esi
+
+ movl %ecx, (%edx)
+ ret
+
+L(done):
+ popl %esi
+ ret
+
+EPILOGUE()
projects / msp430-gcc.git / blobdiff