From a9e48ab40e230c7fe34e4892bec8af4f3f975a20 Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Fri, 4 Jan 2013 15:42:09 +0530 Subject: Clean up comment for MP_NO --- ChangeLog | 2 ++ sysdeps/ieee754/dbl-64/mpa.h | 38 ++++++++++++++++++++++++++------------ 2 files changed, 28 insertions(+), 12 deletions(-) diff --git a/ChangeLog b/ChangeLog index 3309f2066a..3522579d08 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,7 @@ 2013-01-04 Siddhesh Poyarekar + * sysdeps/ieee754/dbl-64/mpa.h: Clean up comment for MP_NO. + * sysdeps/ieee754/dbl-64/mpa.c(norm): Remove commented declarations. (denorm): Likewise. diff --git a/sysdeps/ieee754/dbl-64/mpa.h b/sysdeps/ieee754/dbl-64/mpa.h index 0126ed75a4..1fef3c08b5 100644 --- a/sysdeps/ieee754/dbl-64/mpa.h +++ b/sysdeps/ieee754/dbl-64/mpa.h @@ -36,18 +36,32 @@ /************************************************************************/ -typedef struct {/* This structure holds the details of a multi-precision */ - int e; /* floating point number, x: d[0] holds its sign (-1,0 or 1) */ - double d[40]; /* e holds its exponent (...,-2,-1,0,1,2,...) and */ -} mp_no; /* d[1]...d[p] hold its mantissa digits. The value of x is, */ - /* x = d[1]*r**(e-1) + d[2]*r**(e-2) + ... + d[p]*r**(e-p). */ - /* Here r = 2**24, 0 <= d[i] < r and 1 <= p <= 32. */ - /* p is a global variable. A multi-precision number is */ - /* always normalized. Namely, d[1] > 0. An exception is */ - /* a zero which is characterized by d[0] = 0. The terms */ - /* d[p+1], d[p+2], ... of a none zero number have no */ - /* significance and so are the terms e, d[1],d[2],... */ - /* of a zero. */ +/* The mp_no structure holds the details of a multi-precision floating point + number. + + - The radix of the number (R) is 2 ^ 24. + + - E: The exponent of the number. + + - D[0]: The sign (-1, 1) or 0 if the value is 0. In the latter case, the + values of the remaining members of the structure are ignored. + + - D[1] - D[p]: The mantissa of the number where: + + 0 <= D[i] < R and + P is the precision of the number and 1 <= p <= 32 + + D[p+1] ... D[39] have no significance. + + - The value of the number is: + + D[1] * R ^ (E - 1) + D[2] * R ^ (E - 2) ... D[p] * R ^ (E - p) + + */ +typedef struct { + int e; + double d[40]; +} mp_no; typedef union { int i[2]; double d; } number; -- cgit 1.4.1