[src/trunk]: src/sys/lib/libkern Update to the SoftFloat-2b version of softfl...

To: source-changes-hg%NetBSD.org@localhost
Subject: [src/trunk]: src/sys/lib/libkern Update to the SoftFloat-2b version of softfl...
From: thorpej <thorpej%NetBSD.org@localhost>
Date: Tue, 01 Sep 2020 17:42:10 +0000
details:   https://anonhg.NetBSD.org/src/rev/42428caaaa58
branches:  trunk
changeset: 938075:42428caaaa58
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Tue Sep 01 15:36:53 2020 +0000

description:
Update to the SoftFloat-2b version of softfloat-macros.h.  This makes a
clarifying change to the warranty disclaimer and updates the comments.  NFC.

diffstat:

 sys/lib/libkern/softfloat-macros.h |  438 +++++++++++++++++-------------------
 1 files changed, 208 insertions(+), 230 deletions(-)

diffs (truncated from 615 to 300 lines):

diff -r abd319181e7d -r 42428caaaa58 sys/lib/libkern/softfloat-macros.h
--- a/sys/lib/libkern/softfloat-macros.h        Tue Sep 01 11:24:14 2020 +0000
+++ b/sys/lib/libkern/softfloat-macros.h        Tue Sep 01 15:36:53 2020 +0000
@@ -1,10 +1,9 @@
-/* $NetBSD: softfloat-macros.h,v 1.1 2001/04/26 03:10:47 ross Exp $ */
+/* $NetBSD: softfloat-macros.h,v 1.2 2020/09/01 15:36:53 thorpej Exp $ */
 
-/*
-===============================================================================
+/*============================================================================
 
 This C source fragment is part of the SoftFloat IEC/IEEE Floating-point
-Arithmetic Package, Release 2a.
+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
@@ -13,33 +12,34 @@
 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/
+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 notice) 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 four 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.
 
-===============================================================================
-*/
+=============================================================================*/
 
-/*
--------------------------------------------------------------------------------
-Shifts `a' right by the number of bits given in `count'.  If any nonzero
-bits are shifted off, they are ``jammed'' into the least significant bit of
-the result by setting the least significant bit to 1.  The value of `count'
-can be arbitrarily large; in particular, if `count' is greater than 32, the
-result will be either 0 or 1, depending on whether `a' is zero or nonzero.
-The result is stored in the location pointed to by `zPtr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts `a' right by the number of bits given in `count'.  If any nonzero
+| bits are shifted off, they are ``jammed'' into the least significant bit of
+| the result by setting the least significant bit to 1.  The value of `count'
+| can be arbitrarily large; in particular, if `count' is greater than 32, the
+| result will be either 0 or 1, depending on whether `a' is zero or nonzero.
+| The result is stored in the location pointed to by `zPtr'.
+*----------------------------------------------------------------------------*/
+
 INLINE void shift32RightJamming( bits32 a, int16 count, bits32 *zPtr )
 {
     bits32 z;
@@ -57,16 +57,15 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts `a' right by the number of bits given in `count'.  If any nonzero
-bits are shifted off, they are ``jammed'' into the least significant bit of
-the result by setting the least significant bit to 1.  The value of `count'
-can be arbitrarily large; in particular, if `count' is greater than 64, the
-result will be either 0 or 1, depending on whether `a' is zero or nonzero.
-The result is stored in the location pointed to by `zPtr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts `a' right by the number of bits given in `count'.  If any nonzero
+| bits are shifted off, they are ``jammed'' into the least significant bit of
+| the result by setting the least significant bit to 1.  The value of `count'
+| can be arbitrarily large; in particular, if `count' is greater than 64, the
+| result will be either 0 or 1, depending on whether `a' is zero or nonzero.
+| The result is stored in the location pointed to by `zPtr'.
+*----------------------------------------------------------------------------*/
+
 INLINE void shift64RightJamming( bits64 a, int16 count, bits64 *zPtr )
 {
     bits64 z;
@@ -84,24 +83,23 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts the 128-bit value formed by concatenating `a0' and `a1' right by 64
-_plus_ the number of bits given in `count'.  The shifted result is at most
-64 nonzero bits; this is stored at the location pointed to by `z0Ptr'.  The
-bits shifted off form a second 64-bit result as follows:  The _last_ bit
-shifted off is the most-significant bit of the extra result, and the other
-63 bits of the extra result are all zero if and only if _all_but_the_last_
-bits shifted off were all zero.  This extra result is stored in the location
-pointed to by `z1Ptr'.  The value of `count' can be arbitrarily large.
-    (This routine makes more sense if `a0' and `a1' are considered to form a
-fixed-point value with binary point between `a0' and `a1'.  This fixed-point
-value is shifted right by the number of bits given in `count', and the
-integer part of the result is returned at the location pointed to by
-`z0Ptr'.  The fractional part of the result may be slightly corrupted as
-described above, and is returned at the location pointed to by `z1Ptr'.)
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts the 128-bit value formed by concatenating `a0' and `a1' right by 64
+| _plus_ the number of bits given in `count'.  The shifted result is at most
+| 64 nonzero bits; this is stored at the location pointed to by `z0Ptr'.  The
+| bits shifted off form a second 64-bit result as follows:  The _last_ bit
+| shifted off is the most-significant bit of the extra result, and the other
+| 63 bits of the extra result are all zero if and only if _all_but_the_last_
+| bits shifted off were all zero.  This extra result is stored in the location
+| pointed to by `z1Ptr'.  The value of `count' can be arbitrarily large.
+|     (This routine makes more sense if `a0' and `a1' are considered to form
+| a fixed-point value with binary point between `a0' and `a1'.  This fixed-
+| point value is shifted right by the number of bits given in `count', and
+| the integer part of the result is returned at the location pointed to by
+| `z0Ptr'.  The fractional part of the result may be slightly corrupted as
+| described above, and is returned at the location pointed to by `z1Ptr'.)
+*----------------------------------------------------------------------------*/
+
 INLINE void
  shift64ExtraRightJamming(
      bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )
@@ -131,15 +129,14 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts the 128-bit value formed by concatenating `a0' and `a1' right by the
-number of bits given in `count'.  Any bits shifted off are lost.  The value
-of `count' can be arbitrarily large; in particular, if `count' is greater
-than 128, the result will be 0.  The result is broken into two 64-bit pieces
-which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts the 128-bit value formed by concatenating `a0' and `a1' right by the
+| number of bits given in `count'.  Any bits shifted off are lost.  The value
+| of `count' can be arbitrarily large; in particular, if `count' is greater
+| than 128, the result will be 0.  The result is broken into two 64-bit pieces
+| which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
+*----------------------------------------------------------------------------*/
+
 INLINE void
  shift128Right(
      bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )
@@ -164,18 +161,17 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts the 128-bit value formed by concatenating `a0' and `a1' right by the
-number of bits given in `count'.  If any nonzero bits are shifted off, they
-are ``jammed'' into the least significant bit of the result by setting the
-least significant bit to 1.  The value of `count' can be arbitrarily large;
-in particular, if `count' is greater than 128, the result will be either
-0 or 1, depending on whether the concatenation of `a0' and `a1' is zero or
-nonzero.  The result is broken into two 64-bit pieces which are stored at
-the locations pointed to by `z0Ptr' and `z1Ptr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts the 128-bit value formed by concatenating `a0' and `a1' right by the
+| number of bits given in `count'.  If any nonzero bits are shifted off, they
+| are ``jammed'' into the least significant bit of the result by setting the
+| least significant bit to 1.  The value of `count' can be arbitrarily large;
+| in particular, if `count' is greater than 128, the result will be either
+| 0 or 1, depending on whether the concatenation of `a0' and `a1' is zero or
+| nonzero.  The result is broken into two 64-bit pieces which are stored at
+| the locations pointed to by `z0Ptr' and `z1Ptr'.
+*----------------------------------------------------------------------------*/
+
 INLINE void
  shift128RightJamming(
      bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )
@@ -208,26 +204,25 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts the 192-bit value formed by concatenating `a0', `a1', and `a2' right
-by 64 _plus_ the number of bits given in `count'.  The shifted result is
-at most 128 nonzero bits; these are broken into two 64-bit pieces which are
-stored at the locations pointed to by `z0Ptr' and `z1Ptr'.  The bits shifted
-off form a third 64-bit result as follows:  The _last_ bit shifted off is
-the most-significant bit of the extra result, and the other 63 bits of the
-extra result are all zero if and only if _all_but_the_last_ bits shifted off
-were all zero.  This extra result is stored in the location pointed to by
-`z2Ptr'.  The value of `count' can be arbitrarily large.
-    (This routine makes more sense if `a0', `a1', and `a2' are considered
-to form a fixed-point value with binary point between `a1' and `a2'.  This
-fixed-point value is shifted right by the number of bits given in `count',
-and the integer part of the result is returned at the locations pointed to
-by `z0Ptr' and `z1Ptr'.  The fractional part of the result may be slightly
-corrupted as described above, and is returned at the location pointed to by
-`z2Ptr'.)
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts the 192-bit value formed by concatenating `a0', `a1', and `a2' right
+| by 64 _plus_ the number of bits given in `count'.  The shifted result is
+| at most 128 nonzero bits; these are broken into two 64-bit pieces which are
+| stored at the locations pointed to by `z0Ptr' and `z1Ptr'.  The bits shifted
+| off form a third 64-bit result as follows:  The _last_ bit shifted off is
+| the most-significant bit of the extra result, and the other 63 bits of the
+| extra result are all zero if and only if _all_but_the_last_ bits shifted off
+| were all zero.  This extra result is stored in the location pointed to by
+| `z2Ptr'.  The value of `count' can be arbitrarily large.
+|     (This routine makes more sense if `a0', `a1', and `a2' are considered
+| to form a fixed-point value with binary point between `a1' and `a2'.  This
+| fixed-point value is shifted right by the number of bits given in `count',
+| and the integer part of the result is returned at the locations pointed to
+| by `z0Ptr' and `z1Ptr'.  The fractional part of the result may be slightly
+| corrupted as described above, and is returned at the location pointed to by
+| `z2Ptr'.)
+*----------------------------------------------------------------------------*/
+
 INLINE void
  shift128ExtraRightJamming(
      bits64 a0,
@@ -279,14 +274,13 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts the 128-bit value formed by concatenating `a0' and `a1' left by the
-number of bits given in `count'.  Any bits shifted off are lost.  The value
-of `count' must be less than 64.  The result is broken into two 64-bit
-pieces which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts the 128-bit value formed by concatenating `a0' and `a1' left by the
+| number of bits given in `count'.  Any bits shifted off are lost.  The value
+| of `count' must be less than 64.  The result is broken into two 64-bit
+| pieces which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
+*----------------------------------------------------------------------------*/
+
 INLINE void
  shortShift128Left(
      bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )
@@ -298,15 +292,14 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Shifts the 192-bit value formed by concatenating `a0', `a1', and `a2' left
-by the number of bits given in `count'.  Any bits shifted off are lost.
-The value of `count' must be less than 64.  The result is broken into three
-64-bit pieces which are stored at the locations pointed to by `z0Ptr',
-`z1Ptr', and `z2Ptr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
+| Shifts the 192-bit value formed by concatenating `a0', `a1', and `a2' left
+| by the number of bits given in `count'.  Any bits shifted off are lost.
+| The value of `count' must be less than 64.  The result is broken into three
+| 64-bit pieces which are stored at the locations pointed to by `z0Ptr',
+| `z1Ptr', and `z2Ptr'.
+*----------------------------------------------------------------------------*/
+
 INLINE void
  shortShift192Left(
      bits64 a0,
@@ -335,14 +328,13 @@
 
 }
 
-/*
--------------------------------------------------------------------------------
-Adds the 128-bit value formed by concatenating `a0' and `a1' to the 128-bit
-value formed by concatenating `b0' and `b1'.  Addition is modulo 2^128, so
-any carry out is lost.  The result is broken into two 64-bit pieces which
-are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
--------------------------------------------------------------------------------
-*/
+/*----------------------------------------------------------------------------
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