Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / powerpc64 / mode64 / sublsh1_n.asm

diff --git a/gmp/mpn/powerpc64/mode64/sublsh1_n.asm b/gmp/mpn/powerpc64/mode64/sublsh1_n.asm
new file mode 100644 (file)
index 0000000..69e0dfa
--- /dev/null
+++ b/gmp/mpn/powerpc64/mode64/sublsh1_n.asm
@@ -0,0 +1,83 @@
+dnl  PowerPC-64 mpn_sublsh1_n -- rp[] = up[] - (vp[] << 1)
+
+dnl  Copyright 2003, 2005 Free Software Foundation, Inc.
+
+dnl  This file is part of the GNU MP Library.
+
+dnl  The GNU MP Library is free software; you can redistribute it and/or modify
+dnl  it under the terms of the GNU Lesser General Public License as published
+dnl  by the Free Software Foundation; either version 3 of the License, or (at
+dnl  your option) any later version.
+
+dnl  The GNU MP Library is distributed in the hope that it will be useful, but
+dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+dnl  License for more details.
+
+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 POWER3/PPC630:     2         (1.5 c/l should be possible)
+C POWER4/PPC970:     4         (2.0 c/l should be possible)
+
+C INPUT PARAMETERS
+C rp   r3
+C up   r4
+C vp   r5
+C n    r6
+
+define(`rp',`r3')
+define(`up',`r4')
+define(`vp',`r5')
+
+define(`s0',`r6')
+define(`s1',`r7')
+define(`u0',`r8')
+define(`v0',`r10')
+define(`v1',`r11')
+
+ASM_START()
+PROLOGUE(mpn_sublsh1_n)
+       mtctr   r6              C put n in ctr
+
+       ld      v0, 0(vp)       C load v limb
+       ld      u0, 0(up)       C load u limb
+       addic   up, up, -8      C update up; set cy
+       addi    rp, rp, -8      C update rp
+       sldi    s1, v0, 1
+       bdz     L(end)          C If done, skip loop
+
+L(oop):        ld      v1, 8(vp)       C load v limb
+       subfe   s1, s1, u0      C add limbs with cy, set cy
+       std     s1, 8(rp)       C store result limb
+       srdi    s0, v0, 63      C shift down previous v limb
+       ldu     u0, 16(up)      C load u limb and update up
+       rldimi  s0, v1, 1, 0    C left shift v limb and merge with prev v limb
+
+       bdz     L(exit)         C decrement ctr and exit if done
+
+       ldu     v0, 16(vp)      C load v limb and update vp
+       subfe   s0, s0, u0      C add limbs with cy, set cy
+       stdu    s0, 16(rp)      C store result limb and update rp
+       srdi    s1, v1, 63      C shift down previous v limb
+       ld      u0, 8(up)       C load u limb
+       rldimi  s1, v0, 1, 0    C left shift v limb and merge with prev v limb
+
+       bdnz    L(oop)          C decrement ctr and loop back
+
+L(end):        subfe   r7, s1, u0
+       std     r7, 8(rp)       C store last result limb
+       srdi    r3, v0, 63
+       subfze  r3, r3
+       neg     r3, r3
+       blr
+L(exit):       subfe   r7, s0, u0
+       std     r7, 16(rp)      C store last result limb
+       srdi    r3, v1, 63
+       subfze  r3, r3
+       neg     r3, r3
+       blr
+EPILOGUE()