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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/mul_1.asm, Revision 1.1

1.1     ! maekawa     1: dnl PowerPC-32 mpn_mul_1 -- Multiply a limb vector with a limb and store
        !             2: dnl the result in a second limb vector.
        !             3:
        !             4: dnl Copyright (C) 1995, 1997, 2000 Free Software Foundation, Inc.
        !             5:
        !             6: dnl This file is part of the GNU MP Library.
        !             7:
        !             8: dnl The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: dnl it under the terms of the GNU Lesser General Public License as published by
        !            10: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
        !            11: dnl option) any later version.
        !            12:
        !            13: dnl The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: dnl or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            16: dnl License for more details.
        !            17:
        !            18: dnl You should have received a copy of the GNU Lesser General Public License
        !            19: dnl along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: dnl MA 02111-1307, USA.
        !            22:
        !            23:
        !            24: dnl INPUT PARAMETERS
        !            25: dnl res_ptr    r3
        !            26: dnl s1_ptr     r4
        !            27: dnl size       r5
        !            28: dnl s2_limb    r6
        !            29:
        !            30: dnl This is optimized for the PPC604 but it runs decently even on PPC601.  It
        !            31: dnl has not been tested on a PPC603 since I don't have access to any such
        !            32: dnl machines.
        !            33:
        !            34: include(`../config.m4')
        !            35:
        !            36: ASM_START()
        !            37: PROLOGUE(mpn_mul_1)
        !            38:        mtctr   r5
        !            39:        addi    r3,r3,-4        C adjust res_ptr, it's offset before it's used
        !            40:        li      r12,0           C clear upper product reg
        !            41:        addic   r0,r0,0         C clear cy
        !            42: C Start software pipeline
        !            43:        lwz     r8,0(r4)
        !            44:        bdz     .Lend3
        !            45:        stmw    r30,-8(r1)      C save registers we are supposed to preserve
        !            46:        lwzu    r9,4(r4)
        !            47:        mullw   r11,r8,r6
        !            48:        mulhwu  r0,r8,r6
        !            49:        bdz     .Lend1
        !            50: C Software pipelined main loop
        !            51: .Loop: lwz     r8,4(r4)
        !            52:        mullw   r10,r9,r6
        !            53:        adde    r30,r11,r12
        !            54:        mulhwu  r12,r9,r6
        !            55:        stw     r30,4(r3)
        !            56:        bdz     .Lend2
        !            57:        lwzu    r9,8(r4)
        !            58:        mullw   r11,r8,r6
        !            59:        adde    r31,r10,r0
        !            60:        mulhwu  r0,r8,r6
        !            61:        stwu    r31,8(r3)
        !            62:        bdnz    .Loop
        !            63: C Finish software pipeline
        !            64: .Lend1:        mullw   r10,r9,r6
        !            65:        adde    r30,r11,r12
        !            66:        mulhwu  r12,r9,r6
        !            67:        stw     r30,4(r3)
        !            68:        adde    r31,r10,r0
        !            69:        stwu    r31,8(r3)
        !            70:        addze   r3,r12
        !            71:        lmw     r30,-8(r1)      C restore registers from stack
        !            72:        blr
        !            73: .Lend2:        mullw   r11,r8,r6
        !            74:        adde    r31,r10,r0
        !            75:        mulhwu  r0,r8,r6
        !            76:        stwu    r31,8(r3)
        !            77:        adde    r30,r11,r12
        !            78:        stw     r30,4(r3)
        !            79:        addze   r3,r0
        !            80:        lmw     r30,-8(r1)      C restore registers from stack
        !            81:        blr
        !            82: .Lend3:        mullw   r11,r8,r6
        !            83:        stw     r11,4(r3)
        !            84:        mulhwu  r3,r8,r6
        !            85:        blr
        !            86: EPILOGUE(mpn_mul_1)