[gcc] GCC 4.5.0=>4.5.1

gcc/gmp/doc/isa_abi_headache

Index: gcc/gmp/doc/isa_abi_headache
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-Copyright 2000 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/.
-
-
-
-
-Terms Used In This Document:
-  ISA = Instruction Set Architecture.   The instructions the current
-        processor provides.
-  ABI = Application Binary Interface.  Specifies calling convention,
-        type sizes, etc.
-  AR64 = Arithmetic operations are 64-bit using 64-bit instructions
-	 (E.g., addition, subtraction, load, store, of 64-bit integer types
-	 are done with single instructions, not 32 bits at a time.)
-  Environment = The operating system and compiler.
-
-GMP is a very complex package to build since its speed is very
-sensitive to the ISA and ABI.  For example, if the ISA provides 64-bit
-instructions, it is crucial that GMP is configured to use them.
-
-Most environments that run on a 64-bit ISA provide more than one ABI.
-Typically one of the supported ABI's is a backward compatible 32-bit
-ABI, and one ABI provides 64-bit addressing and `long' (sometimes
-known as LP64).  But a few environments (IRIX, HP-UX) provide
-intermediate ABI's using 32-bit addressing but allow efficient 64-bit
-operations through a `long long' type.  For the latter to be useful to
-GMP, the ABI must allow operations using the native 64-bit
-instructions provided by the ISA, and allow passing of 64-bit
-quantities atomically.
-
-The ABI is typically chosen by means of command line options to the
-compiler tools (gcc, cc, c89, nm, ar, ld, as).  Different environments
-use different defaults, but as of this writing (May 2000) the
-dominating default is to the plain 32-bit ABI in its most arcane form.
-
-The GMP 3.0.x approach was to compile using the ABI that gives the
-best performance.  That places the burden on users to pass special
-options to the compiler when they compile their GMP applications.
-That approach has its advantages and disadvantages.  The main
-advantage is that users don't unknowingly get bad GMP performance.
-The main disadvantage is that users' compiles (actually links) will
-fail unless they pass special compiler options.
-
-** SPARC
-
-System vendors often confuse ABI, ISA, and implementation.  The worst
-case is Solaris, were the unbundled compiler confuses ISA and ABI, and
-the options have very confusing names.
-
-     option		interpretation
-     ======		==============
-cc   -xarch=v8plus	ISA=sparcv9, ABI=V8plus (PTR=32, see below)
-gcc  -mv8plus		ISA=sparcv9, ABI=V8plus (see below)
-cc   -xarch=v9		ISA=sparcv9, ABI=V9 (implying AR=64, PTR=64)
-
-It's hard to believe, but the option v8plus really means ISA=V9!
-
-Solaris releases prior to version 7 running on a V9 CPU fails to
-save/restore the upper 32 bits of the `i' and `l' registers.  The
-`v8plus' option generates code that use as many V9 features as
-possible under such circumstances.
-
-** MIPS
-
-The IRIX 6 compilers gets things right.  They have a clear
-understanding of the differences between ABI and ISA.  The option
-names are descriptive.
-
-     option		interpretation
-     ======		==============
-cc   -n32		ABI=n32 (implying AR=64, PTR=32)
-gcc  -mabi=n32		ABI=n32 (implying AR=64, PTR=32)
-cc   -64		ABI=64 (implying AR=64, PTR=64)
-gcc  -mabi=64		ABI=64 (implying AR=64, PTR=64)
-cc   -mips3		ISA=mips3
-gcc  -mips3		ISA=mips3
-cc   -mips4		ISA=mips4
-gcc  -mips4		ISA=mips4
-
-** HP-PA
-
-HP-UX is somewhat weird, but not as broken as Solaris.
-
-     option		interpretation
-     ======		==============
-cc   +DA2.0		ABI=32bit (implying AR=64, PTR=32)
-cc   +DD64		ABI=64bit (implying AR=64, PTR=64)
-
-Code performing 64-bit arithmetic in the HP-UX 32-bit is not
-compatible with the 64-bit ABI; the former has a calling convention
-that passes/returns 64-bit integer quantities as two 32-bit chunks.
-
-** PowerPC
-
-While the PowerPC ABI's are capable of supporting 64-bit
-registers/operations, the compilers under AIX are similar to Solaris'
-cc in that they don't currently provide any 32-bit addressing with
-64-bit arithmetic.
-
-     option			interpretation
-     ======			==============
-cc   -q64			ABI=64bit (implying AR=64, PTR=64)
-gcc  -maix64 -mpowerpc64	ABI=64bit (implying AR=64, PTR=64)