1dnl IA-64 mpn_invert_limb -- Invert a normalized limb. 2 3dnl Copyright 2000, 2002, 2004 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of the GNU Lesser General Public License as published 9dnl by the Free Software Foundation; either version 3 of the License, or (at 10dnl your option) any later version. 11 12dnl The GNU MP Library is distributed in the hope that it will be useful, but 13dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15dnl License for more details. 16 17dnl You should have received a copy of the GNU Lesser General Public License 18dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 19 20include(`../config.m4') 21 22C INPUT PARAMETERS 23C d = r32 24 25C cycles 26C Itanium: 74 27C Itanium 2: 50+6 28 29C It should be possible to avoid the xmpy.hu and the following tests by 30C explicitly chopping in the last fma. That would save about 10 cycles. 31 32ASM_START() 33 .sdata 34 .align 16 35ifdef(`HAVE_DOUBLE_IEEE_LITTLE_ENDIAN',` 36.LC0: data4 0x00000000, 0x80000000, 0x0000403f, 0x00000000 C 2^64 37.LC1: data4 0x00000000, 0x80000000, 0x0000407f, 0x00000000 C 2^128 38 39',`ifdef(`HAVE_DOUBLE_IEEE_BIG_ENDIAN',` 40.LC0: data4 0x403f8000, 0x00000000, 0x00000000, 0x00000000 C 2^64 41.LC1: data4 0x407f8000, 0x00000000, 0x00000000, 0x00000000 C 2^128 42 43',`m4_error(`Oops, need to know float endianness 44')')') 45 46 47PROLOGUE(mpn_invert_limb) 48 C 00 49 addl r14 = @gprel(.LC0), gp 50 addl r15 = @gprel(.LC1), gp 51 setf.sig f7 = r32 52 add r9 = r32, r32 C check for d = 2^63 53 ;; C 01 54 ldfe f10 = [r14] C 2^64 55 ldfe f8 = [r15] C 2^128 56 cmp.eq p6, p0 = 0, r9 C check for d = 2^63 57 mov r8 = -1 C retval for 2^63 58 (p6) br.ret.spnt.many b0 59 ;; C 07 60 fmpy.s1 f11 = f7, f10 C f11 = d * 2^64 61 fnma.s1 f6 = f7, f10, f8 C f6 = 2^128 - d * 2^64 62 ;; C 11 63 frcpa.s1 f8, p6 = f6, f7 64 ;; C 15 65 (p6) fnma.s1 f9 = f7, f8, f1 66 (p6) fmpy.s1 f10 = f6, f8 67 ;; C 19 68 (p6) fmpy.s1 f11 = f9, f9 69 (p6) fma.s1 f10 = f9, f10, f10 70 ;; C 23 71 (p6) fma.s1 f8 = f9, f8, f8 72 (p6) fma.s1 f9 = f11, f10, f10 73 ;; C 27 74 (p6) fma.s1 f8 = f11, f8, f8 75 (p6) fnma.s1 f10 = f7, f9, f6 76 ;; C 31 77 (p6) fma.s1 f8 = f10, f8, f9 78 ;; C 35 79 fcvt.fxu.trunc.s1 f8 = f8 80 ;; C 39 81 getf.sig r8 = f8 82 xmpy.hu f10 = f8, f7 C di * d 83 ;; C 43 84 getf.sig r14 = f10 85 andcm r9 = -1, r32 C one's complement 86 ;; C 48 87 cmp.ltu p6, p0 = r9, r14 C got overflow? 88 ;; C 49 89 (p6) add r8 = -1, r8 C adjust di down 90 br.ret.sptk.many b0 91EPILOGUE() 92ASM_END() 93