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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/mul_1.asm, Revision 1.1.1.1

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)