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Annotation of OpenXM_contrib/gmp/mpn/ia64/invert_limb.asm, Revision 1.1

1.1     ! ohara       1: dnl  IA-64 mpn_invert_limb -- Invert a normalized limb.
        !             2:
        !             3: dnl  Copyright (C) 2000 Free Software Foundation, Inc.
        !             4:
        !             5: dnl  This file is part of the GNU MP Library.
        !             6:
        !             7: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: dnl  it under the terms of the GNU Lesser General Public License as published
        !             9: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            10: dnl  your option) any later version.
        !            11:
        !            12: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: dnl  License for more details.
        !            16:
        !            17: dnl  You should have received a copy of the GNU Lesser General Public License
        !            18: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: dnl  MA 02111-1307, USA.
        !            21:
        !            22: include(`../config.m4')
        !            23:
        !            24: C INPUT PARAMETERS
        !            25: C d = r32
        !            26:
        !            27: C It should be possible to avoid the xmpy.hu and the following tests by
        !            28: C explicitly chopping in the last fma.  That would save about 10 cycles.
        !            29:
        !            30: ASM_START()
        !            31:        .section        .rodata
        !            32:        .align 16
        !            33: .LC0:  data4 0x00000000, 0x80000000, 0x0000403f, 0x00000000    C 2^64
        !            34:        data4 0x00000000, 0x80000000, 0x0000407f, 0x00000000    C 2^128
        !            35:
        !            36: PROLOGUE(mpn_invert_limb)
        !            37:        addl            r14 = @ltoff(.LC0),gp
        !            38:        add             r8 = r32,r32;;                  C check for d = 2^63
        !            39:        ld8             r14 = [r14]
        !            40:        cmp.eq          p6,p7 = 0,r8;;                  C check for d = 2^63
        !            41:        ldfe            f10 = [r14],16                  C 2^64
        !            42:        setf.sig        f7 = r32
        !            43:        mov             r8 = -1
        !            44:    (p6)        br.ret.spnt     b0;;
        !            45:        ldfe            f8 = [r14]                      C 2^128
        !            46:        fmpy.s1         f11 = f7,f10;;                  C scale by 2^64
        !            47:        fsub.s1         f6 = f8,f11;;
        !            48:        frcpa.s1        f8,p6 = f6,f7;;
        !            49:    (p6) fnma.s1                f9 = f7,f8,f1
        !            50:    (p6) fmpy.s1                f10 = f6,f8;;
        !            51:    (p6) fmpy.s1                f11 = f9,f9
        !            52:    (p6) fma.s1         f10 = f9,f10,f10;;
        !            53:    (p6) fma.s1         f8 = f9,f8,f8
        !            54:    (p6) fma.s1         f9 = f11,f10,f10;;
        !            55:    (p6) fma.s1         f8 = f11,f8,f8
        !            56:    (p6) fnma.s1                f10 = f7,f9,f6;;
        !            57:    (p6) fma.s1         f8 = f10,f8,f9;;
        !            58:        fcvt.fxu.trunc.s1 f8 = f8;;
        !            59:        xmpy.hu         f10 = f8,f7;;                   C di * d
        !            60:        getf.sig        r8 = f8
        !            61:        getf.sig        r14 = f10;;
        !            62:        add             r32 = r32,r14;;
        !            63:        cmp.ltu         p6,p7 = r32,r14;;               C got overflow?
        !            64:    (p6) add            r8 = -1,r8                      C adjust di down
        !            65:        br.ret.sptk     b0
        !            66: EPILOGUE(mpn_invert_limb)
        !            67: ASM_END()