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linux/arch/ia64/lib/idiv64.S

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* Copyright (C) 1999-2000 Hewlett-Packard Co
* Copyright (C) 1999-2000 David Mosberger-Tang <davidm@hpl.hp.com>
*
* 64-bit integer division.
*
* This code is based on the application note entitled "Divide, Square Root
* and Remainder Algorithms for the IA-64 Architecture". This document
* is available as Intel document number 248725-002 or via the web at
* http://developer.intel.com/software/opensource/numerics/
*
* For more details on the theory behind these algorithms, see "IA-64
* and Elementary Functions" by Peter Markstein; HP Professional Books
arch/ia64/lib: Fix broken URL in comments The URL to the book IA-64 and Elementary Functions in idiv32.S and idiv64.S just led to a 404 page, so I updated them with a known good link that others can reference. Signed-off-by: Sina Hamedian <shamedian@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2016-01-31 14:07:31 +08:00
* (http://www.goodreads.com/book/show/2019887.Ia_64_and_Elementary_Functions)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*/
#include <asm/asmmacro.h>
ia64: move exports to definitions Here we have another kind of deviation from the default case - a difference between exporting functions and non-functions. EXPORT_DATA_SYMBOL... is really different from EXPORT_SYMBOL... on ia64, and we need to use the right one when moving exports from *.c where C compiler has the required information to *.S, where we need to supply it manually. parisc64 will be another one like that. Tested-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-17 14:13:41 +08:00
#include <asm/export.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#ifdef MODULO
# define OP mod
#else
# define OP div
#endif
#ifdef UNSIGNED
# define SGN u
# define INT_TO_FP(a,b) fcvt.xuf.s1 a=b
# define FP_TO_INT(a,b) fcvt.fxu.trunc.s1 a=b
#else
# define SGN
# define INT_TO_FP(a,b) fcvt.xf a=b
# define FP_TO_INT(a,b) fcvt.fx.trunc.s1 a=b
#endif
#define PASTE1(a,b) a##b
#define PASTE(a,b) PASTE1(a,b)
#define NAME PASTE(PASTE(__,SGN),PASTE(OP,di3))
GLOBAL_ENTRY(NAME)
.regstk 2,0,0,0
// Transfer inputs to FP registers.
setf.sig f8 = in0
setf.sig f9 = in1
;;
// Convert the inputs to FP, to avoid FP software-assist faults.
INT_TO_FP(f8, f8)
INT_TO_FP(f9, f9)
;;
frcpa.s1 f11, p6 = f8, f9 // y0 = frcpa(b)
;;
(p6) fmpy.s1 f7 = f8, f11 // q0 = a*y0
(p6) fnma.s1 f6 = f9, f11, f1 // e0 = -b*y0 + 1
;;
(p6) fma.s1 f10 = f7, f6, f7 // q1 = q0*e0 + q0
(p6) fmpy.s1 f7 = f6, f6 // e1 = e0*e0
;;
#ifdef MODULO
sub in1 = r0, in1 // in1 = -b
#endif
(p6) fma.s1 f10 = f10, f7, f10 // q2 = q1*e1 + q1
(p6) fma.s1 f6 = f11, f6, f11 // y1 = y0*e0 + y0
;;
(p6) fma.s1 f6 = f6, f7, f6 // y2 = y1*e1 + y1
(p6) fnma.s1 f7 = f9, f10, f8 // r = -b*q2 + a
;;
#ifdef MODULO
setf.sig f8 = in0 // f8 = a
setf.sig f9 = in1 // f9 = -b
#endif
(p6) fma.s1 f11 = f7, f6, f10 // q3 = r*y2 + q2
;;
FP_TO_INT(f11, f11) // q = trunc(q3)
;;
#ifdef MODULO
xma.l f11 = f11, f9, f8 // r = q*(-b) + a
;;
#endif
getf.sig r8 = f11 // transfer result to result register
br.ret.sptk.many rp
END(NAME)
ia64: move exports to definitions Here we have another kind of deviation from the default case - a difference between exporting functions and non-functions. EXPORT_DATA_SYMBOL... is really different from EXPORT_SYMBOL... on ia64, and we need to use the right one when moving exports from *.c where C compiler has the required information to *.S, where we need to supply it manually. parisc64 will be another one like that. Tested-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-17 14:13:41 +08:00
EXPORT_SYMBOL(NAME)