|
@@ -1,140 +0,0 @@
|
|
|
-/*
|
|
|
-** libgcc support for software floating point.
|
|
|
-** Copyright (C) 1991 by Pipeline Associates, Inc. All rights reserved.
|
|
|
-** Permission is granted to do *anything* you want with this file,
|
|
|
-** commercial or otherwise, provided this message remains intact. So there!
|
|
|
-** I would appreciate receiving any updates/patches/changes that anyone
|
|
|
-** makes, and am willing to be the repository for said changes (am I
|
|
|
-** making a big mistake?).
|
|
|
-
|
|
|
-Warning! Only single-precision is actually implemented. This file
|
|
|
-won't really be much use until double-precision is supported.
|
|
|
-
|
|
|
-However, once that is done, this file might eventually become a
|
|
|
-replacement for libgcc1.c. It might also make possible
|
|
|
-cross-compilation for an IEEE target machine from a non-IEEE
|
|
|
-host such as a VAX.
|
|
|
-
|
|
|
-If you'd like to work on completing this, please talk to rms@gnu.ai.mit.edu.
|
|
|
-
|
|
|
---> Double precision floating support added by James Carlson on 20 April 1998.
|
|
|
-
|
|
|
-**
|
|
|
-** Pat Wood
|
|
|
-** Pipeline Associates, Inc.
|
|
|
-** pipeline!phw@motown.com or
|
|
|
-** sun!pipeline!phw or
|
|
|
-** uunet!motown!pipeline!phw
|
|
|
-**
|
|
|
-** 05/01/91 -- V1.0 -- first release to gcc mailing lists
|
|
|
-** 05/04/91 -- V1.1 -- added float and double prototypes and return values
|
|
|
-** -- fixed problems with adding and subtracting zero
|
|
|
-** -- fixed rounding in truncdfsf2
|
|
|
-** -- fixed SWAP define and tested on 386
|
|
|
-*/
|
|
|
-
|
|
|
-/*
|
|
|
-** The following are routines that replace the libgcc soft floating point
|
|
|
-** routines that are called automatically when -msoft-float is selected.
|
|
|
-** The support single and double precision IEEE format, with provisions
|
|
|
-** for byte-swapped machines (tested on 386). Some of the double-precision
|
|
|
-** routines work at full precision, but most of the hard ones simply punt
|
|
|
-** and call the single precision routines, producing a loss of accuracy.
|
|
|
-** long long support is not assumed or included.
|
|
|
-** Overall accuracy is close to IEEE (actually 68882) for single-precision
|
|
|
-** arithmetic. I think there may still be a 1 in 1000 chance of a bit
|
|
|
-** being rounded the wrong way during a multiply. I'm not fussy enough to
|
|
|
-** bother with it, but if anyone is, knock yourself out.
|
|
|
-**
|
|
|
-** Efficiency has only been addressed where it was obvious that something
|
|
|
-** would make a big difference. Anyone who wants to do this right for
|
|
|
-** best speed should go in and rewrite in assembler.
|
|
|
-**
|
|
|
-** I have tested this only on a 68030 workstation and 386/ix integrated
|
|
|
-** in with -msoft-float.
|
|
|
-*/
|
|
|
-
|
|
|
-#ifndef __FLOAT_LIB_H__
|
|
|
-#define __FLOAT_LIB_H__
|
|
|
-/* the following deal with IEEE single-precision numbers */
|
|
|
-#define EXCESS 126
|
|
|
-#define SIGNBIT 0x80000000
|
|
|
-#define HIDDEN (1 << 23)
|
|
|
-#define SIGN(fp) ((fp) & SIGNBIT)
|
|
|
-#define EXP(fp) (((fp) >> 23) & 0xFF)
|
|
|
-#define MANT(fp) (((fp) & 0x7FFFFF) | HIDDEN)
|
|
|
-#define PACK(s,e,m) ((s) | ((e) << 23) | (m))
|
|
|
-
|
|
|
-/* the following deal with IEEE double-precision numbers */
|
|
|
-#define EXCESSD 1022
|
|
|
-#define HIDDEND (1 << 20)
|
|
|
-#define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF)
|
|
|
-#define SIGND(fp) ((fp.l.upper) & SIGNBIT)
|
|
|
-#define MANTD(fp) (((((fp.l.upper) & 0xFFFFF) | HIDDEND) << 10) | \
|
|
|
- (fp.l.lower >> 22))
|
|
|
-#define HIDDEND_LL ((long long)1 << 52)
|
|
|
-#define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
|
|
|
-#define PACKD_LL(s,e,m) (((long long)((s)+((e)<<20))<<32)|(m))
|
|
|
-
|
|
|
-/* define SWAP for 386/960 reverse-byte-order brain-damaged CPUs */
|
|
|
-union double_long {
|
|
|
- double d;
|
|
|
-#ifdef SWAP
|
|
|
- struct {
|
|
|
- unsigned long lower;
|
|
|
- long upper;
|
|
|
- } l;
|
|
|
-#else
|
|
|
- struct {
|
|
|
- long upper;
|
|
|
- unsigned long lower;
|
|
|
- } l;
|
|
|
-#endif
|
|
|
- long long ll;
|
|
|
-};
|
|
|
-
|
|
|
-union float_long
|
|
|
- {
|
|
|
- float f;
|
|
|
- long l;
|
|
|
- };
|
|
|
-
|
|
|
-#endif
|
|
|
-
|
|
|
-/* Functions defined in different files */
|
|
|
-
|
|
|
-float __addsf3 (float, float);
|
|
|
-float __subsf3 (float, float);
|
|
|
-long __cmpsf2 (float, float);
|
|
|
-float __mulsf3 (float, float);
|
|
|
-float __divsf3 (float, float);
|
|
|
-double __floatsidf (register long);
|
|
|
-double __floatdidf (register long long);
|
|
|
-float __floatsisf (register long );
|
|
|
-float __floatdisf (register long long );
|
|
|
-float __negsf2 (float);
|
|
|
-double __negdf2 (double);
|
|
|
-double __extendsfdf2 (float);
|
|
|
-float __truncdfsf2 (double);
|
|
|
-long __cmpdf2 (double, double);
|
|
|
-long __fixsfsi (float);
|
|
|
-long __fixdfsi (double);
|
|
|
-long long __fixdfdi (double);
|
|
|
-unsigned long __fixunsdfsi (double);
|
|
|
-unsigned long long __fixunsdfdi (double);
|
|
|
-double __adddf3 (double, double);
|
|
|
-double __subdf3 (double, double);
|
|
|
-double __muldf3 (double, double);
|
|
|
-double __divdf3 (double, double);
|
|
|
-int __gtdf2 (double, double);
|
|
|
-int __gedf2 (double, double);
|
|
|
-int __ltdf2 (double, double);
|
|
|
-int __ledf2 (double, double);
|
|
|
-int __eqdf2 (double, double);
|
|
|
-int __nedf2 (double, double);
|
|
|
-int __gtsf2 (float, float);
|
|
|
-int __gesf2 (float, float);
|
|
|
-int __ltsf2 (float, float);
|
|
|
-int __lesf2 (float, float);
|
|
|
-int __eqsf2 (float, float);
|
|
|
-int __nesf2 (float, float);
|