[gcc] GCC 4.5.0=>4.5.1

gcc/gmp/mpn/pa32/README

Index: gcc/gmp/mpn/pa32/README
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-Copyright 1996, 1999, 2001, 2002, 2004 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 HP PA-RISC chips.  Code
-that runs faster on the PA7100 and later implementations, is in the pa7100
-directory.
-
-RELEVANT OPTIMIZATION ISSUES
-
-  Load and Store timing
-
-On the PA7000 no memory instructions can issue the two cycles after a store.
-For the PA7100, this is reduced to one cycle.
-
-The PA7100 has a lookup-free cache, so it helps to schedule loads and the
-dependent instruction really far from each other.
-
-STATUS
-
-1. mpn_mul_1 could be improved to 6.5 cycles/limb on the PA7100, using the
-   instructions below (but some sw pipelining is needed to avoid the
-   xmpyu-fstds delay):
-
-	fldds	s1_ptr
-
-	xmpyu
-	fstds	N(%r30)
-	xmpyu
-	fstds	N(%r30)
-
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-
-	addc
-	stws	res_ptr
-	addc
-	stws	res_ptr
-
-	addib	Loop
-
-2. mpn_addmul_1 could be improved from the current 10 to 7.5 cycles/limb
-   (asymptotically) on the PA7100, using the instructions below.  With proper
-   sw pipelining and the unrolling level below, the speed becomes 8
-   cycles/limb.
-
-	fldds	s1_ptr
-	fldds	s1_ptr
-
-	xmpyu
-	fstds	N(%r30)
-	xmpyu
-	fstds	N(%r30)
-	xmpyu
-	fstds	N(%r30)
-	xmpyu
-	fstds	N(%r30)
-
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	ldws	N(%r30)
-	addc
-	addc
-	addc
-	addc
-	addc	%r0,%r0,cy-limb
-
-	ldws	res_ptr
-	ldws	res_ptr
-	ldws	res_ptr
-	ldws	res_ptr
-	add
-	stws	res_ptr
-	addc
-	stws	res_ptr
-	addc
-	stws	res_ptr
-	addc
-	stws	res_ptr
-
-	addib
-
-3. For the PA8000 we have to stick to using 32-bit limbs before compiler
-   support emerges.  But we want to use 64-bit operations whenever possible,
-   in particular for loads and stores.  It is possible to handle mpn_add_n
-   efficiently by rotating (when s1/s2 are aligned), masking+bit field
-   inserting when (they are not).  The speed should double compared to the
-   code used today.
-
-
-
-
-LABEL SYNTAX
-
-The HP-UX assembler takes labels starting in column 0 with no colon,
-
-	L$loop  ldws,mb -4(0,%r25),%r22
-
-Gas on hppa GNU/Linux however requires a colon,
-
-	L$loop: ldws,mb -4(0,%r25),%r22
-
-This is covered by using LDEF() from asm-defs.m4.  An alternative would be
-to use ".label" which is accepted by both,
-
-		.label  L$loop
-		ldws,mb -4(0,%r25),%r22
-
-but that's not as nice to look at, not if you're used to assembler code
-having labels in column 0.
-
-
-
-
-REFERENCES
-
-Hewlett Packard, "HP Assembler Reference Manual", 9th edition, June 1998,
-part number 92432-90012.
-
-
-
-----------------
-Local variables:
-mode: text
-fill-column: 76
-End: