1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/powerpc/add_n.s b/sysdeps/powerpc/add_n.s
new file mode 100644
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--- /dev/null
+++ b/sysdeps/powerpc/add_n.s
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+ # Add two limb vectors of equal, non-zero length for PowerPC.
+ # Copyright (C) 1997 Free Software Foundation, Inc.
+ # This file is part of the GNU C Library.
+ #
+ # The GNU C Library is free software; you can redistribute it and/or
+ # modify it under the terms of the GNU Library General Public License as
+ # published by the Free Software Foundation; either version 2 of the
+ # License, or (at your option) any later version.
+ #
+ # The GNU C Library is distributed in the hope that it will be useful,
+ # but WITHOUT ANY WARRANTY; without even the implied warranty of
+ # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ # Library General Public License for more details.
+ #
+ # You should have received a copy of the GNU Library General Public
+ # License along with the GNU C Library; see the file COPYING.LIB.  If not,
+ # write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ # Boston, MA 02111-1307, USA.
+
+ # mp_limb_t mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr,
+ #                      mp_size_t size)
+ # Calculate s1+s2 and put result in res_ptr; return carry, 0 or 1.
+
+ # Note on optimisation: This code is optimal for the 601.  Almost every other
+ # possible 2-unrolled inner loop will not be.  Also, watch out for the
+ # alignment...
+
+	.align 3
+	.globl __mpn_add_n
+	.type	 __mpn_add_n,@function
+__mpn_add_n:
+ # Set up for loop below.
+	mtcrf 0x01,%r6
+	srwi. %r7,%r6,1
+	li    %r10,0
+	mtctr %r7
+	bt    31,2f
+
+ # Clear the carry.
+	addic %r0,%r0,0
+ # Adjust pointers for loop.
+	addi  %r3,%r3,-4
+	addi  %r4,%r4,-4
+	addi  %r5,%r5,-4
+	b     0f
+
+2:	lwz  %r7,0(%r5)
+	lwz  %r6,0(%r4)
+	addc %r6,%r6,%r7
+	stw  %r6,0(%r3)
+        beq  1f
+
+ # The loop.
+
+ # Align start of loop to an odd word boundary to guarantee that the
+ # last two words can be fetched in one access (for 601).
+0:	lwz  %r9,4(%r4)
+	lwz  %r8,4(%r5)
+	lwzu %r6,8(%r4)
+	lwzu %r7,8(%r5)
+	adde %r8,%r9,%r8
+	stw  %r8,4(%r3)
+	adde %r6,%r6,%r7
+	stwu %r6,8(%r3)
+	bdnz 0b
+ # return the carry
+1:	addze %r3,%r10
+	blr