Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / pa64 / sub_n.asm

diff --git a/gmp/mpn/pa64/sub_n.asm b/gmp/mpn/pa64/sub_n.asm
new file mode 100644 (file)
index 0000000..8ad524d
--- /dev/null
+++ b/gmp/mpn/pa64/sub_n.asm
@@ -0,0 +1,93 @@
+dnl  HP-PA 2.0 mpn_sub_n -- Subtract two limb vectors of the same length > 0
+dnl  and store difference in a third limb vector.
+
+dnl  Copyright 1997, 2000, 2002, 2003 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/.
+
+
+dnl  This runs at 2 cycles/limb on PA8000 and 1.6875 cycles/limb on PA8500.  It
+dnl  should be possible to reach the cache bandwith 1.5 cycles/limb at least
+dnl  with PA8500.  The problem now is stalling of the first SUB,DB after LDO,
+dnl  where the processor gets confused about where carry comes from.
+
+include(`../config.m4')
+
+dnl INPUT PARAMETERS
+define(`rp',`%r26')
+define(`up',`%r25')
+define(`vp',`%r24')
+define(`n',`%r23')
+
+ifdef(`HAVE_ABI_2_0w',
+`       .level  2.0w
+',`     .level  2.0
+')
+PROLOGUE(mpn_sub_n)
+       sub             %r0, n, %r22
+       depw,z          %r22, 30, 3, %r28       C r28 = 2 * (-n & 7)
+       depw,z          %r22, 28, 3, %r22       C r22 = 8 * (-n & 7)
+       sub             up, %r22, up            C offset up
+       sub             vp, %r22, vp            C offset vp
+       blr             %r28, %r0               C branch into loop
+       sub             rp, %r22, rp            C offset rp and set carry
+
+LDEF(loop)
+       ldd             0(up), %r20
+       ldd             0(vp), %r31
+       sub,db          %r20, %r31, %r20
+       std             %r20, 0(rp)
+LDEF(7)        ldd             8(up), %r21
+       ldd             8(vp), %r19
+       sub,db          %r21, %r19, %r21
+       std             %r21, 8(rp)
+LDEF(6)        ldd             16(up), %r20
+       ldd             16(vp), %r31
+       sub,db          %r20, %r31, %r20
+       std             %r20, 16(rp)
+LDEF(5)        ldd             24(up), %r21
+       ldd             24(vp), %r19
+       sub,db          %r21, %r19, %r21
+       std             %r21, 24(rp)
+LDEF(4)        ldd             32(up), %r20
+       ldd             32(vp), %r31
+       sub,db          %r20, %r31, %r20
+       std             %r20, 32(rp)
+LDEF(3)        ldd             40(up), %r21
+       ldd             40(vp), %r19
+       sub,db          %r21, %r19, %r21
+       std             %r21, 40(rp)
+LDEF(2)        ldd             48(up), %r20
+       ldd             48(vp), %r31
+       sub,db          %r20, %r31, %r20
+       std             %r20, 48(rp)
+LDEF(1)        ldd             56(up), %r21
+       ldd             56(vp),%r19
+       sub,db          %r21, %r19, %r21
+       ldo             64(up), up
+       std             %r21, 56(rp)
+       ldo             64(vp), vp
+       addib,>         -8, n, L(loop)
+       ldo             64(rp), rp
+
+       add,dc          %r0, %r0, %r29
+       subi            1, %r29, %r29
+       bve             (%r2)
+ifdef(`HAVE_ABI_2_0w',
+`      copy            %r29, %r28
+',`    ldi             0, %r28
+')
+EPILOGUE(mpn_sub_n)