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+/*
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+** libgcc support for software floating point.
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+** Copyright (C) 1991 by Pipeline Associates, Inc. All rights reserved.
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+** Permission is granted to do *anything* you want with this file,
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+** commercial or otherwise, provided this message remains intact. So there!
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+** I would appreciate receiving any updates/patches/changes that anyone
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+** makes, and am willing to be the repository for said changes (am I
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+** making a big mistake?).
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+
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+Warning! Only single-precision is actually implemented. This file
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+won't really be much use until double-precision is supported.
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+
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+However, once that is done, this file might eventually become a
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+replacement for libgcc1.c. It might also make possible
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+cross-compilation for an IEEE target machine from a non-IEEE
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+host such as a VAX.
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+
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+If you'd like to work on completing this, please talk to rms@gnu.ai.mit.edu.
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+
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+--> Double precision floating support added by James Carlson on 20 April 1998.
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+
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+**
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+** Pat Wood
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+** Pipeline Associates, Inc.
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+** pipeline!phw@motown.com or
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+** sun!pipeline!phw or
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+** uunet!motown!pipeline!phw
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+**
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+** 05/01/91 -- V1.0 -- first release to gcc mailing lists
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+** 05/04/91 -- V1.1 -- added float and double prototypes and return values
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+** -- fixed problems with adding and subtracting zero
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+** -- fixed rounding in truncdfsf2
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+** -- fixed SWAP define and tested on 386
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+*/
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+
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+/*
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+** The following are routines that replace the libgcc soft floating point
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+** routines that are called automatically when -msoft-float is selected.
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+** The support single and double precision IEEE format, with provisions
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+** for byte-swapped machines (tested on 386). Some of the double-precision
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+** routines work at full precision, but most of the hard ones simply punt
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+** and call the single precision routines, producing a loss of accuracy.
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+** long long support is not assumed or included.
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+** Overall accuracy is close to IEEE (actually 68882) for single-precision
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+** arithmetic. I think there may still be a 1 in 1000 chance of a bit
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+** being rounded the wrong way during a multiply. I'm not fussy enough to
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+** bother with it, but if anyone is, knock yourself out.
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+**
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+** Efficiency has only been addressed where it was obvious that something
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+** would make a big difference. Anyone who wants to do this right for
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+** best speed should go in and rewrite in assembler.
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+**
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+** I have tested this only on a 68030 workstation and 386/ix integrated
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+** in with -msoft-float.
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+*/
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+
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+#ifndef __FLOAT_LIB_H__
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+#define __FLOAT_LIB_H__
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+/* the following deal with IEEE single-precision numbers */
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+#define EXCESS 126
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+#define SIGNBIT 0x80000000
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+#define HIDDEN (1 << 23)
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+#define SIGN(fp) ((fp) & SIGNBIT)
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+#define EXP(fp) (((fp) >> 23) & 0xFF)
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+#define MANT(fp) (((fp) & 0x7FFFFF) | HIDDEN)
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+#define PACK(s,e,m) ((s) | ((e) << 23) | (m))
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+
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+/* the following deal with IEEE double-precision numbers */
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+#define EXCESSD 1022
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+#define HIDDEND (1 << 20)
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+#define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF)
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+#define SIGND(fp) ((fp.l.upper) & SIGNBIT)
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+#define MANTD(fp) (((((fp.l.upper) & 0xFFFFF) | HIDDEND) << 10) | \
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+ (fp.l.lower >> 22))
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+#define HIDDEND_LL ((long long)1 << 52)
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+#define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
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+#define PACKD_LL(s,e,m) (((long long)((s)+((e)<<20))<<32)|(m))
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+
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+/* define SWAP for 386/960 reverse-byte-order brain-damaged CPUs */
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+union double_long {
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+ double d;
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+#ifdef SWAP
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+ struct {
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+ unsigned long lower;
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+ long upper;
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+ } l;
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+#else
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+ struct {
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+ long upper;
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+ unsigned long lower;
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+ } l;
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+#endif
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+ long long ll;
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+};
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+
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+union float_long
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+ {
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+ float f;
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+ long l;
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+ };
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+
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+#endif
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+
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+/* Functions defined in different files */
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+
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+float __addsf3 (float, float);
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+float __subsf3 (float, float);
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+long __cmpsf2 (float, float);
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+float __mulsf3 (float, float);
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+float __divsf3 (float, float);
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+double __floatsidf (register long);
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+double __floatdidf (register long long);
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+float __floatsisf (register long );
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+float __floatdisf (register long long );
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+float __negsf2 (float);
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+double __negdf2 (double);
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+double __extendsfdf2 (float);
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+float __truncdfsf2 (double);
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+long __cmpdf2 (double, double);
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+long __fixsfsi (float);
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+long __fixdfsi (double);
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+long long __fixdfdi (double);
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+unsigned long __fixunsdfsi (double);
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+unsigned long long __fixunsdfdi (double);
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+double __adddf3 (double, double);
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+double __subdf3 (double, double);
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+double __muldf3 (double, double);
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+double __divdf3 (double, double);
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+int __gtdf2 (double, double);
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+int __gedf2 (double, double);
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+int __ltdf2 (double, double);
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+int __ledf2 (double, double);
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+int __eqdf2 (double, double);
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+int __nedf2 (double, double);
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+int __gtsf2 (float, float);
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+int __gesf2 (float, float);
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+int __ltsf2 (float, float);
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+int __lesf2 (float, float);
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+int __eqsf2 (float, float);
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+int __nesf2 (float, float);
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