[gcc] GCC 4.5.0=>4.5.1

gcc/gmp/mpn/sparc32/README

Index: gcc/gmp/mpn/sparc32/README
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-Copyright 1996, 2001 Free Software Foundation, Inc.
-
-This file is part of the GNU MP Library.
-
-The GNU MP Library is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 3 of the License, or (at your
-option) any later version.
-
-The GNU MP Library is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
-License for more details.
-
-You should have received a copy of the GNU Lesser General Public License
-along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
-
-
-
-
-
-This directory contains mpn functions for various SPARC chips.  Code that
-runs only on version 8 SPARC implementations, is in the v8 subdirectory.
-
-RELEVANT OPTIMIZATION ISSUES
-
-  Load and Store timing
-
-On most early SPARC implementations, the ST instructions takes multiple
-cycles, while a STD takes just a single cycle more than an ST.  For the CPUs
-in SPARCstation I and II, the times are 3 and 4 cycles, respectively.
-Therefore, combining two ST instructions into a STD when possible is a
-significant optimization.
-
-Later SPARC implementations have single cycle ST.
-
-For SuperSPARC, we can perform just one memory instruction per cycle, even
-if up to two integer instructions can be executed in its pipeline.  For
-programs that perform so many memory operations that there are not enough
-non-memory operations to issue in parallel with all memory operations, using
-LDD and STD when possible helps.
-
-UltraSPARC-1/2 has very slow integer multiplication.  In the v9 subdirectory,
-we therefore use floating-point multiplication.
-
-STATUS
-
-1. On a SuperSPARC, mpn_lshift and mpn_rshift run at 3 cycles/limb, or 2.5
-   cycles/limb asymptotically.  We could optimize speed for special counts
-   by using ADDXCC.
-
-2. On a SuperSPARC, mpn_add_n and mpn_sub_n runs at 2.5 cycles/limb, or 2
-   cycles/limb asymptotically.
-
-3. mpn_mul_1 runs at what is believed to be optimal speed.
-
-4. On SuperSPARC, mpn_addmul_1 and mpn_submul_1 could both be improved by a
-   cycle by avoiding one of the add instructions.  See a29k/addmul_1.
-
-The speed of the code for other SPARC implementations is uncertain.