mirror of
https://github.com/enjoy-digital/litex.git
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software/libbase: upgrade softfloat to version 2b + add support for more precision
This commit is contained in:
Sebastien Bourdeauducq
parent
22f7d1716e
commit
97b77945e5
5 changed files with 3268 additions and 1930 deletions
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@ -1,9 +1,8 @@
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/*
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===============================================================================
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/*============================================================================
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This C header file is part of the SoftFloat IEC/IEEE Floating-point
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Arithmetic Package, Release 2.
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This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
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Package, Release 2b.
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Written by John R. Hauser. This work was made possible in part by the
|
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International Computer Science Institute, located at Suite 600, 1947 Center
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|
|
@ -12,54 +11,48 @@ National Science Foundation under grant MIP-9311980. The original version
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|||
of this code was written as part of a project to build a fixed-point vector
|
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processor in collaboration with the University of California at Berkeley,
|
||||
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
||||
is available through the Web page `http://http.cs.berkeley.edu/~jhauser/
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arithmetic/softfloat.html'.
|
||||
is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
|
||||
arithmetic/SoftFloat.html'.
|
||||
|
||||
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
||||
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
||||
TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
||||
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
||||
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
||||
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
|
||||
been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
|
||||
RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
|
||||
AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
|
||||
COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
|
||||
EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
|
||||
INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
|
||||
OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
|
||||
|
||||
Derivative works are acceptable, even for commercial purposes, so long as
|
||||
(1) they include prominent notice that the work is derivative, and (2) they
|
||||
include prominent notice akin to these three paragraphs for those parts of
|
||||
this code that are retained.
|
||||
(1) the source code for the derivative work includes prominent notice that
|
||||
the work is derivative, and (2) the source code includes prominent notice with
|
||||
these four paragraphs for those parts of this code that are retained.
|
||||
|
||||
===============================================================================
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||||
*/
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=============================================================================*/
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/*
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-------------------------------------------------------------------------------
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Common integer types and flags.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Include common integer types and flags.
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*----------------------------------------------------------------------------*/
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/*
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-------------------------------------------------------------------------------
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One of the macros `BIGENDIAN' or `LITTLEENDIAN' must be defined.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| One of the macros `BIGENDIAN' or `LITTLEENDIAN' must be defined.
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*----------------------------------------------------------------------------*/
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#define BIGENDIAN
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/*
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-------------------------------------------------------------------------------
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The macro `BITS64' can be defined to indicate that 64-bit integer types are
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supported by the compiler.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| The macro `BITS64' can be defined to indicate that 64-bit integer types are
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| supported by the compiler.
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*----------------------------------------------------------------------------*/
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//#define BITS64
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/*
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-------------------------------------------------------------------------------
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Each of the following `typedef's defines the most convenient type that holds
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integers of at least as many bits as specified. For example, `uint8' should
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be the most convenient type that can hold unsigned integers of as many as
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8 bits. The `flag' type must be able to hold either a 0 or 1. For most
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implementations of C, `flag', `uint8', and `int8' should all be `typedef'ed
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to the same as `int'.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Each of the following `typedef's defines the most convenient type that holds
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| integers of at least as many bits as specified. For example, `uint8' should
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| be the most convenient type that can hold unsigned integers of as many as
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| 8 bits. The `flag' type must be able to hold either a 0 or 1. For most
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| implementations of C, `flag', `uint8', and `int8' should all be `typedef'ed
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| to the same as `int'.
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*----------------------------------------------------------------------------*/
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typedef int flag;
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typedef int uint8;
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typedef int int8;
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@ -68,18 +61,16 @@ typedef int int16;
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typedef unsigned int uint32;
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typedef signed int int32;
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#ifdef BITS64
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typedef unsigned long long int bits64;
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typedef signed long long int sbits64;
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typedef unsigned long long int uint64;
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typedef signed long long int int64;
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#endif
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/*
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-------------------------------------------------------------------------------
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Each of the following `typedef's defines a type that holds integers
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of _exactly_ the number of bits specified. For instance, for most
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implementation of C, `bits16' and `sbits16' should be `typedef'ed to
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`unsigned short int' and `signed short int' (or `short int'), respectively.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Each of the following `typedef's defines a type that holds integers
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| of _exactly_ the number of bits specified. For instance, for most
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| implementation of C, `bits16' and `sbits16' should be `typedef'ed to
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| `unsigned short int' and `signed short int' (or `short int'), respectively.
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*----------------------------------------------------------------------------*/
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typedef unsigned char bits8;
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typedef signed char sbits8;
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typedef unsigned short int bits16;
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@ -87,38 +78,33 @@ typedef signed short int sbits16;
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typedef unsigned int bits32;
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typedef signed int sbits32;
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#ifdef BITS64
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typedef unsigned long long int uint64;
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typedef signed long long int int64;
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typedef unsigned long long int bits64;
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typedef signed long long int sbits64;
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#endif
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#ifdef BITS64
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/*
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-------------------------------------------------------------------------------
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The `LIT64' macro takes as its argument a textual integer literal and if
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necessary ``marks'' the literal as having a 64-bit integer type. For
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example, the Gnu C Compiler (`gcc') requires that 64-bit literals be
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appended with the letters `LL' standing for `long long', which is `gcc's
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name for the 64-bit integer type. Some compilers may allow `LIT64' to be
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defined as the identity macro: `#define LIT64( a ) a'.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| The `LIT64' macro takes as its argument a textual integer literal and
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| if necessary ``marks'' the literal as having a 64-bit integer type.
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| For example, the GNU C Compiler (`gcc') requires that 64-bit literals be
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| appended with the letters `LL' standing for `long long', which is `gcc's
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| name for the 64-bit integer type. Some compilers may allow `LIT64' to be
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| defined as the identity macro: `#define LIT64( a ) a'.
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*----------------------------------------------------------------------------*/
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#define LIT64( a ) a##LL
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#endif
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/*
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-------------------------------------------------------------------------------
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The macro `INLINE' can be used before functions that should be inlined. If
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a compiler does not support explicit inlining, this macro should be defined
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to be `static'.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| The macro `INLINE' can be used before functions that should be inlined. If
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| a compiler does not support explicit inlining, this macro should be defined
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| to be `static'.
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*----------------------------------------------------------------------------*/
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#define INLINE extern inline
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/*
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-------------------------------------------------------------------------------
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Symbolic Boolean literals.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Symbolic Boolean literals.
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*----------------------------------------------------------------------------*/
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enum {
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FALSE = 0,
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TRUE = 1
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|
|
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File diff suppressed because it is too large
Load diff
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|
@ -1,9 +1,8 @@
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|||
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/*
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||||
===============================================================================
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/*============================================================================
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||||
|
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This C source fragment is part of the SoftFloat IEC/IEEE Floating-point
|
||||
Arithmetic Package, Release 2.
|
||||
Arithmetic Package, Release 2b.
|
||||
|
||||
Written by John R. Hauser. This work was made possible in part by the
|
||||
International Computer Science Institute, located at Suite 600, 1947 Center
|
||||
|
|
@ -12,39 +11,38 @@ National Science Foundation under grant MIP-9311980. The original version
|
|||
of this code was written as part of a project to build a fixed-point vector
|
||||
processor in collaboration with the University of California at Berkeley,
|
||||
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
||||
is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
|
||||
arithmetic/softfloat.html'.
|
||||
is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
|
||||
arithmetic/SoftFloat.html'.
|
||||
|
||||
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
||||
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
||||
TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
||||
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
||||
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
||||
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
|
||||
been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
|
||||
RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
|
||||
AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
|
||||
COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
|
||||
EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
|
||||
INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
|
||||
OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
|
||||
|
||||
Derivative works are acceptable, even for commercial purposes, so long as
|
||||
(1) they include prominent notice that the work is derivative, and (2) they
|
||||
include prominent notice akin to these three paragraphs for those parts of
|
||||
this code that are retained.
|
||||
(1) the source code for the derivative work includes prominent notice that
|
||||
the work is derivative, and (2) the source code includes prominent notice with
|
||||
these four paragraphs for those parts of this code that are retained.
|
||||
|
||||
===============================================================================
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||||
*/
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=============================================================================*/
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/*
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-------------------------------------------------------------------------------
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Underflow tininess-detection mode, statically initialized to default value.
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(The declaration in `softfloat.h' must match the `int8' type here.)
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Underflow tininess-detection mode, statically initialized to default value.
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| (The declaration in `softfloat.h' must match the `int8' type here.)
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*----------------------------------------------------------------------------*/
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int8 float_detect_tininess = float_tininess_after_rounding;
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/*
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-------------------------------------------------------------------------------
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Raises the exceptions specified by `flags'. Floating-point traps can be
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defined here if desired. It is currently not possible for such a trap to
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substitute a result value. If traps are not implemented, this routine
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should be simply `float_exception_flags |= flags;'.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Raises the exceptions specified by `flags'. Floating-point traps can be
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| defined here if desired. It is currently not possible for such a trap
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| to substitute a result value. If traps are not implemented, this routine
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| should be simply `float_exception_flags |= flags;'.
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*----------------------------------------------------------------------------*/
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void float_raise( int8 flags )
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{
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@ -52,31 +50,26 @@ void float_raise( int8 flags )
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}
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/*
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-------------------------------------------------------------------------------
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Internal canonical NaN format.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Internal canonical NaN format.
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*----------------------------------------------------------------------------*/
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typedef struct {
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flag sign;
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bits32 high, low;
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} commonNaNT;
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/*
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-------------------------------------------------------------------------------
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The pattern for a default generated single-precision NaN.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| The pattern for a default generated single-precision NaN.
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*----------------------------------------------------------------------------*/
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enum {
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float32_default_nan = 0xFFFFFFFF
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};
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/*
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-------------------------------------------------------------------------------
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Returns 1 if the single-precision floating-point value `a' is a NaN;
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otherwise returns 0.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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| Returns 1 if the single-precision floating-point value `a' is a NaN;
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| otherwise returns 0.
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*----------------------------------------------------------------------------*/
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flag float32_is_nan( float32 a )
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{
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@ -84,12 +77,11 @@ flag float32_is_nan( float32 a )
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}
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/*
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-------------------------------------------------------------------------------
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Returns 1 if the single-precision floating-point value `a' is a signaling
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NaN; otherwise returns 0.
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-------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
|
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| Returns 1 if the single-precision floating-point value `a' is a signaling
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| NaN; otherwise returns 0.
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*----------------------------------------------------------------------------*/
|
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flag float32_is_signaling_nan( float32 a )
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{
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|
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@ -97,13 +89,42 @@ flag float32_is_signaling_nan( float32 a )
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|
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}
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|
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/*
|
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-------------------------------------------------------------------------------
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Takes two single-precision floating-point values `a' and `b', one of which
|
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is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
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signaling NaN, the invalid exception is raised.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
/*----------------------------------------------------------------------------
|
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| Returns the result of converting the single-precision floating-point NaN
|
||||
| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
|
||||
| exception is raised.
|
||||
*----------------------------------------------------------------------------*/
|
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|
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static commonNaNT float32ToCommonNaN( float32 a )
|
||||
{
|
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commonNaNT z;
|
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|
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if ( float32_is_signaling_nan( a ) ) float_raise( float_flag_invalid );
|
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z.sign = a>>31;
|
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z.low = 0;
|
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z.high = a<<9;
|
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return z;
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the canonical NaN `a' to the single-
|
||||
| precision floating-point format.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
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static float32 commonNaNToFloat32( commonNaNT a )
|
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{
|
||||
|
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return ( ( (bits32) a.sign )<<31 ) | 0x7FC00000 | ( a.high>>9 );
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Takes two single-precision floating-point values `a' and `b', one of which
|
||||
| is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
||||
| signaling NaN, the invalid exception is raised.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
static float32 propagateFloat32NaN( float32 a, float32 b )
|
||||
{
|
||||
flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN;
|
||||
|
|
@ -123,3 +144,99 @@ static float32 propagateFloat32NaN( float32 a, float32 b )
|
|||
}
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| The pattern for a default generated double-precision NaN. The `high' and
|
||||
| `low' values hold the most- and least-significant bits, respectively.
|
||||
*----------------------------------------------------------------------------*/
|
||||
enum {
|
||||
float64_default_nan_high = 0xFFFFFFFF,
|
||||
float64_default_nan_low = 0xFFFFFFFF
|
||||
};
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns 1 if the double-precision floating-point value `a' is a NaN;
|
||||
| otherwise returns 0.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
flag float64_is_nan( float64 a )
|
||||
{
|
||||
|
||||
return
|
||||
( 0xFFE00000 <= (bits32) ( a.high<<1 ) )
|
||||
&& ( a.low || ( a.high & 0x000FFFFF ) );
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns 1 if the double-precision floating-point value `a' is a signaling
|
||||
| NaN; otherwise returns 0.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
flag float64_is_signaling_nan( float64 a )
|
||||
{
|
||||
|
||||
return
|
||||
( ( ( a.high>>19 ) & 0xFFF ) == 0xFFE )
|
||||
&& ( a.low || ( a.high & 0x0007FFFF ) );
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point NaN
|
||||
| `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
|
||||
| exception is raised.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
static commonNaNT float64ToCommonNaN( float64 a )
|
||||
{
|
||||
commonNaNT z;
|
||||
|
||||
if ( float64_is_signaling_nan( a ) ) float_raise( float_flag_invalid );
|
||||
z.sign = a.high>>31;
|
||||
shortShift64Left( a.high, a.low, 12, &z.high, &z.low );
|
||||
return z;
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the canonical NaN `a' to the double-
|
||||
| precision floating-point format.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
static float64 commonNaNToFloat64( commonNaNT a )
|
||||
{
|
||||
float64 z;
|
||||
|
||||
shift64Right( a.high, a.low, 12, &z.high, &z.low );
|
||||
z.high |= ( ( (bits32) a.sign )<<31 ) | 0x7FF80000;
|
||||
return z;
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Takes two double-precision floating-point values `a' and `b', one of which
|
||||
| is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
||||
| signaling NaN, the invalid exception is raised.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
static float64 propagateFloat64NaN( float64 a, float64 b )
|
||||
{
|
||||
flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN;
|
||||
|
||||
aIsNaN = float64_is_nan( a );
|
||||
aIsSignalingNaN = float64_is_signaling_nan( a );
|
||||
bIsNaN = float64_is_nan( b );
|
||||
bIsSignalingNaN = float64_is_signaling_nan( b );
|
||||
a.high |= 0x00080000;
|
||||
b.high |= 0x00080000;
|
||||
if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid );
|
||||
if ( aIsNaN ) {
|
||||
return ( aIsSignalingNaN & bIsNaN ) ? b : a;
|
||||
}
|
||||
else {
|
||||
return b;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load diff
|
|
@ -1,120 +1,134 @@
|
|||
|
||||
/*
|
||||
===============================================================================
|
||||
|
||||
This C header file is part of the SoftFloat IEC/IEEE Floating-point
|
||||
Arithmetic Package, Release 2.
|
||||
|
||||
Written by John R. Hauser. This work was made possible in part by the
|
||||
International Computer Science Institute, located at Suite 600, 1947 Center
|
||||
Street, Berkeley, California 94704. Funding was partially provided by the
|
||||
National Science Foundation under grant MIP-9311980. The original version
|
||||
of this code was written as part of a project to build a fixed-point vector
|
||||
processor in collaboration with the University of California at Berkeley,
|
||||
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
||||
is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
|
||||
arithmetic/softfloat.html'.
|
||||
|
||||
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
|
||||
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
|
||||
TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
|
||||
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
|
||||
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
|
||||
|
||||
Derivative works are acceptable, even for commercial purposes, so long as
|
||||
(1) they include prominent notice that the work is derivative, and (2) they
|
||||
include prominent notice akin to these three paragraphs for those parts of
|
||||
this code that are retained.
|
||||
|
||||
===============================================================================
|
||||
*/
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE floating-point types.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
typedef unsigned int float32;
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE floating-point underflow tininess-detection mode.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
extern int float_detect_tininess;
|
||||
enum {
|
||||
float_tininess_after_rounding = 0,
|
||||
float_tininess_before_rounding = 1
|
||||
};
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE floating-point rounding mode.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
extern int float_rounding_mode;
|
||||
enum {
|
||||
float_round_nearest_even = 0,
|
||||
float_round_to_zero = 1,
|
||||
float_round_up = 2,
|
||||
float_round_down = 3
|
||||
};
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE floating-point exception flags.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
extern int float_exception_flags;
|
||||
enum {
|
||||
float_flag_inexact = 1,
|
||||
float_flag_divbyzero = 2,
|
||||
float_flag_underflow = 4,
|
||||
float_flag_overflow = 8,
|
||||
float_flag_invalid = 16
|
||||
};
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Routine to raise any or all of the software IEC/IEEE floating-point
|
||||
exception flags.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
void float_raise( int );
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE integer-to-floating-point conversion routines.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
float32 int32_to_float32( int );
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE single-precision conversion routines.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
int float32_to_int32( float32 );
|
||||
int float32_to_int32_round_to_zero( float32 );
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
Software IEC/IEEE single-precision operations.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
float32 float32_round_to_int( float32 );
|
||||
float32 float32_add( float32, float32 );
|
||||
float32 float32_sub( float32, float32 );
|
||||
float32 float32_mul( float32, float32 );
|
||||
float32 float32_div( float32, float32 );
|
||||
float32 float32_rem( float32, float32 );
|
||||
float32 float32_sqrt( float32 );
|
||||
flag float32_eq( float32, float32 );
|
||||
flag float32_le( float32, float32 );
|
||||
flag float32_lt( float32, float32 );
|
||||
flag float32_eq_signaling( float32, float32 );
|
||||
flag float32_le_quiet( float32, float32 );
|
||||
flag float32_lt_quiet( float32, float32 );
|
||||
flag float32_is_nan( float32 a );
|
||||
flag float32_is_signaling_nan( float32 );
|
||||
|
||||
|
||||
/*============================================================================
|
||||
|
||||
This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
|
||||
Package, Release 2b.
|
||||
|
||||
Written by John R. Hauser. This work was made possible in part by the
|
||||
International Computer Science Institute, located at Suite 600, 1947 Center
|
||||
Street, Berkeley, California 94704. Funding was partially provided by the
|
||||
National Science Foundation under grant MIP-9311980. The original version
|
||||
of this code was written as part of a project to build a fixed-point vector
|
||||
processor in collaboration with the University of California at Berkeley,
|
||||
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
|
||||
is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
|
||||
arithmetic/SoftFloat.html'.
|
||||
|
||||
THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
|
||||
been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
|
||||
RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
|
||||
AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
|
||||
COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
|
||||
EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
|
||||
INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
|
||||
OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
|
||||
|
||||
Derivative works are acceptable, even for commercial purposes, so long as
|
||||
(1) the source code for the derivative work includes prominent notice that
|
||||
the work is derivative, and (2) the source code includes prominent notice with
|
||||
these four paragraphs for those parts of this code that are retained.
|
||||
|
||||
=============================================================================*/
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE floating-point types.
|
||||
*----------------------------------------------------------------------------*/
|
||||
typedef bits32 float32;
|
||||
typedef struct {
|
||||
bits32 high, low;
|
||||
} float64;
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE floating-point underflow tininess-detection mode.
|
||||
*----------------------------------------------------------------------------*/
|
||||
extern int8 float_detect_tininess;
|
||||
enum {
|
||||
float_tininess_after_rounding = 0,
|
||||
float_tininess_before_rounding = 1
|
||||
};
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE floating-point rounding mode.
|
||||
*----------------------------------------------------------------------------*/
|
||||
extern int8 float_rounding_mode;
|
||||
enum {
|
||||
float_round_nearest_even = 0,
|
||||
float_round_to_zero = 1,
|
||||
float_round_down = 2,
|
||||
float_round_up = 3
|
||||
};
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE floating-point exception flags.
|
||||
*----------------------------------------------------------------------------*/
|
||||
extern int8 float_exception_flags;
|
||||
enum {
|
||||
float_flag_inexact = 1,
|
||||
float_flag_underflow = 2,
|
||||
float_flag_overflow = 4,
|
||||
float_flag_divbyzero = 8,
|
||||
float_flag_invalid = 16
|
||||
};
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Routine to raise any or all of the software IEC/IEEE floating-point
|
||||
| exception flags.
|
||||
*----------------------------------------------------------------------------*/
|
||||
void float_raise( int8 );
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE integer-to-floating-point conversion routines.
|
||||
*----------------------------------------------------------------------------*/
|
||||
float32 int32_to_float32( int32 );
|
||||
float64 int32_to_float64( int32 );
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE single-precision conversion routines.
|
||||
*----------------------------------------------------------------------------*/
|
||||
int32 float32_to_int32( float32 );
|
||||
int32 float32_to_int32_round_to_zero( float32 );
|
||||
float64 float32_to_float64( float32 );
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE single-precision operations.
|
||||
*----------------------------------------------------------------------------*/
|
||||
float32 float32_round_to_int( float32 );
|
||||
float32 float32_add( float32, float32 );
|
||||
float32 float32_sub( float32, float32 );
|
||||
float32 float32_mul( float32, float32 );
|
||||
float32 float32_div( float32, float32 );
|
||||
float32 float32_rem( float32, float32 );
|
||||
float32 float32_sqrt( float32 );
|
||||
flag float32_eq( float32, float32 );
|
||||
flag float32_le( float32, float32 );
|
||||
flag float32_lt( float32, float32 );
|
||||
flag float32_eq_signaling( float32, float32 );
|
||||
flag float32_le_quiet( float32, float32 );
|
||||
flag float32_lt_quiet( float32, float32 );
|
||||
flag float32_is_signaling_nan( float32 );
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE double-precision conversion routines.
|
||||
*----------------------------------------------------------------------------*/
|
||||
int32 float64_to_int32( float64 );
|
||||
int32 float64_to_int32_round_to_zero( float64 );
|
||||
float32 float64_to_float32( float64 );
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software IEC/IEEE double-precision operations.
|
||||
*----------------------------------------------------------------------------*/
|
||||
float64 float64_round_to_int( float64 );
|
||||
float64 float64_add( float64, float64 );
|
||||
float64 float64_sub( float64, float64 );
|
||||
float64 float64_mul( float64, float64 );
|
||||
float64 float64_div( float64, float64 );
|
||||
float64 float64_rem( float64, float64 );
|
||||
float64 float64_sqrt( float64 );
|
||||
flag float64_eq( float64, float64 );
|
||||
flag float64_le( float64, float64 );
|
||||
flag float64_lt( float64, float64 );
|
||||
flag float64_eq_signaling( float64, float64 );
|
||||
flag float64_le_quiet( float64, float64 );
|
||||
flag float64_lt_quiet( float64, float64 );
|
||||
flag float64_is_signaling_nan( float64 );
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue