linux/arch/ia64/lib/idiv32.S
Al Viro e007c53397 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>
2016-08-07 23:55:50 -04:00

86 lines
2.1 KiB
ArmAsm

/*
* Copyright (C) 2000 Hewlett-Packard Co
* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
*
* 32-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
* (http://www.goodreads.com/book/show/2019887.Ia_64_and_Elementary_Functions)
*/
#include <asm/asmmacro.h>
#include <asm/export.h>
#ifdef MODULO
# define OP mod
#else
# define OP div
#endif
#ifdef UNSIGNED
# define SGN u
# define EXTEND zxt4
# 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 EXTEND sxt4
# 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,si3))
GLOBAL_ENTRY(NAME)
.regstk 2,0,0,0
// Transfer inputs to FP registers.
mov r2 = 0xffdd // r2 = -34 + 65535 (fp reg format bias)
EXTEND in0 = in0 // in0 = a
EXTEND in1 = in1 // in1 = b
;;
setf.sig f8 = in0
setf.sig f9 = in1
#ifdef MODULO
sub in1 = r0, in1 // in1 = -b
#endif
;;
// Convert the inputs to FP, to avoid FP software-assist faults.
INT_TO_FP(f8, f8)
INT_TO_FP(f9, f9)
;;
setf.exp f7 = r2 // f7 = 2^-34
frcpa.s1 f6, p6 = f8, f9 // y0 = frcpa(b)
;;
(p6) fmpy.s1 f8 = f8, f6 // q0 = a*y0
(p6) fnma.s1 f6 = f9, f6, f1 // e0 = -b*y0 + 1
;;
#ifdef MODULO
setf.sig f9 = in1 // f9 = -b
#endif
(p6) fma.s1 f8 = f6, f8, f8 // q1 = e0*q0 + q0
(p6) fma.s1 f6 = f6, f6, f7 // e1 = e0*e0 + 2^-34
;;
#ifdef MODULO
setf.sig f7 = in0
#endif
(p6) fma.s1 f6 = f6, f8, f8 // q2 = e1*q1 + q1
;;
FP_TO_INT(f6, f6) // q = trunc(q2)
;;
#ifdef MODULO
xma.l f6 = f6, f9, f7 // r = q*(-b) + a
;;
#endif
getf.sig r8 = f6 // transfer result to result register
br.ret.sptk.many rp
END(NAME)
EXPORT_SYMBOL(NAME)