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Annotation of OpenXM_contrib/gmp/mpn/pa32/hppa1_1/submul_1.asm, Revision 1.1

1.1     ! ohara       1: dnl  HP-PA 1.1 mpn_submul_1 -- Multiply a limb vector with a limb and subtract
        !             2: dnl  the result from a second limb vector.
        !             3:
        !             4: dnl  Copyright 1992, 1993, 1994, 2000, 2001, 2002 Free Software Foundation,
        !             5: dnl  Inc.
        !             6:
        !             7: dnl  This file is part of the GNU MP Library.
        !             8:
        !             9: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: dnl  it under the terms of the GNU Lesser General Public License as published
        !            11: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            12: dnl  your option) any later version.
        !            13:
        !            14: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: dnl  License for more details.
        !            18:
        !            19: dnl  You should have received a copy of the GNU Lesser General Public License
        !            20: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: dnl  MA 02111-1307, USA.
        !            23:
        !            24: include(`../config.m4')
        !            25:
        !            26: C INPUT PARAMETERS
        !            27: C res_ptr      r26
        !            28: C s1_ptr       r25
        !            29: C size         r24
        !            30: C s2_limb      r23
        !            31:
        !            32: C This runs at 12 cycles/limb on a PA7000.  With the used instructions, it can
        !            33: C not become faster due to data cache contention after a store.  On the PA7100
        !            34: C it runs at 11 cycles/limb.
        !            35:
        !            36: C There are some ideas described in mul_1.asm that applies to this code too.
        !            37:
        !            38: C It seems possible to make this run as fast as mpn_addmul_1, if we use
        !            39: C      sub,>>= %r29,%r19,%r22
        !            40: C      addi    1,%r28,%r28
        !            41: C but that requires reworking the hairy software pipeline...
        !            42:
        !            43: ASM_START()
        !            44: PROLOGUE(mpn_submul_1)
        !            45: C      .callinfo       frame=64,no_calls
        !            46:
        !            47:        ldo             64(%r30),%r30
        !            48:        fldws,ma        4(%r25),%fr5
        !            49:        stw             %r23,-16(%r30)          C move s2_limb ...
        !            50:        addib,=         -1,%r24,L(just_one_limb)
        !            51:         fldws          -16(%r30),%fr4          C ... into fr4
        !            52:        add             %r0,%r0,%r0             C clear carry
        !            53:        xmpyu           %fr4,%fr5,%fr6
        !            54:        fldws,ma        4(%r25),%fr7
        !            55:        fstds           %fr6,-16(%r30)
        !            56:        xmpyu           %fr4,%fr7,%fr8
        !            57:        ldw             -12(%r30),%r19          C least significant limb in product
        !            58:        ldw             -16(%r30),%r28
        !            59:
        !            60:        fstds           %fr8,-16(%r30)
        !            61:        addib,=         -1,%r24,L(end)
        !            62:         ldw            -12(%r30),%r1
        !            63:
        !            64: C Main loop
        !            65:        .label  L(loop)
        !            66:        ldws            0(%r26),%r29
        !            67:        fldws,ma        4(%r25),%fr5
        !            68:        sub             %r29,%r19,%r22
        !            69:        add             %r22,%r19,%r0
        !            70:        stws,ma         %r22,4(%r26)
        !            71:        addc            %r28,%r1,%r19
        !            72:        xmpyu           %fr4,%fr5,%fr6
        !            73:        ldw             -16(%r30),%r28
        !            74:        fstds           %fr6,-16(%r30)
        !            75:        addc            %r0,%r28,%r28
        !            76:        addib,<>        -1,%r24,L(loop)
        !            77:         ldw            -12(%r30),%r1
        !            78:
        !            79:        .label  L(end)
        !            80:        ldw             0(%r26),%r29
        !            81:        sub             %r29,%r19,%r22
        !            82:        add             %r22,%r19,%r0
        !            83:        stws,ma         %r22,4(%r26)
        !            84:        addc            %r28,%r1,%r19
        !            85:        ldw             -16(%r30),%r28
        !            86:        ldws            0(%r26),%r29
        !            87:        addc            %r0,%r28,%r28
        !            88:        sub             %r29,%r19,%r22
        !            89:        add             %r22,%r19,%r0
        !            90:        stws,ma         %r22,4(%r26)
        !            91:        addc            %r0,%r28,%r28
        !            92:        bv              0(%r2)
        !            93:         ldo            -64(%r30),%r30
        !            94:
        !            95:        .label  L(just_one_limb)
        !            96:        xmpyu           %fr4,%fr5,%fr6
        !            97:        ldw             0(%r26),%r29
        !            98:        fstds           %fr6,-16(%r30)
        !            99:        ldw             -12(%r30),%r1
        !           100:        ldw             -16(%r30),%r28
        !           101:        sub             %r29,%r1,%r22
        !           102:        add             %r22,%r1,%r0
        !           103:        stw             %r22,0(%r26)
        !           104:        addc            %r0,%r28,%r28
        !           105:        bv              0(%r2)
        !           106:         ldo            -64(%r30),%r30
        !           107: EPILOGUE()