Module Name: src
Committed By: jakllsch
Date: Sun Jun 9 15:06:07 UTC 2024
Modified Files:
src/lib/libc/gdtoa: hdtoa.c
Log Message:
Fix hdtoa() for VAX D floating point
To generate a diff of this commit:
cvs rdiff -u -r1.13 -r1.14 src/lib/libc/gdtoa/hdtoa.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/lib/libc/gdtoa/hdtoa.c
diff -u src/lib/libc/gdtoa/hdtoa.c:1.13 src/lib/libc/gdtoa/hdtoa.c:1.14
--- src/lib/libc/gdtoa/hdtoa.c:1.13 Thu May 9 12:24:24 2024
+++ src/lib/libc/gdtoa/hdtoa.c Sun Jun 9 15:06:07 2024
@@ -1,4 +1,4 @@
-/* $NetBSD: hdtoa.c,v 1.13 2024/05/09 12:24:24 riastradh Exp $ */
+/* $NetBSD: hdtoa.c,v 1.14 2024/06/09 15:06:07 jakllsch Exp $ */
/*-
* Copyright (c) 2004, 2005 David Schultz <[email protected]>
@@ -30,7 +30,7 @@
#if 0
__FBSDID("$FreeBSD: src/lib/libc/gdtoa/_hdtoa.c,v 1.4 2007/01/03 04:57:58 das Exp $");
#else
-__RCSID("$NetBSD: hdtoa.c,v 1.13 2024/05/09 12:24:24 riastradh Exp $");
+__RCSID("$NetBSD: hdtoa.c,v 1.14 2024/06/09 15:06:07 jakllsch Exp $");
#endif
#include <float.h>
@@ -59,8 +59,12 @@ __RCSID("$NetBSD: hdtoa.c,v 1.13 2024/05
#define INFSTR "Infinity"
#define NANSTR "NaN"
+#ifndef __vax__
#define DBL_ADJ (DBL_MAX_EXP - 2 + ((DBL_MANT_DIG - 1) % 4))
#define LDBL_ADJ (LDBL_MAX_EXP - 2 + ((LDBL_MANT_DIG - 1) % 4))
+#else /* __vax__ */
+#define DBL_ADJ (DBL_MAX_EXP + 4 + ((DBL_MANT_DIG) % 4))
+#endif
/*
* Round up the given digit string. If the digit string is fff...f,
@@ -152,6 +156,11 @@ hdtoa(double d, const char *xdigs, int n
u.dblu_d = d;
*sign = u.dblu_dbl.dbl_sign;
+#ifdef __vax__
+ u.dfltu_dflt.dflt_fracl =
+ ((u.dfltu_dflt.dflt_fracl >> 16) & 0xFFFF) |
+ ((u.dfltu_dflt.dflt_fracl & 0xffff) << 16);
+#endif
switch (fpclassify(d)) {
case FP_NORMAL:
@@ -160,16 +169,11 @@ hdtoa(double d, const char *xdigs, int n
case FP_ZERO:
*decpt = 1;
return (nrv_alloc("0", rve, 1));
+#ifndef __vax__
case FP_SUBNORMAL:
-#ifdef __vax__
- /* (DBL_MAX_EXP=127 / 2) + 2 = 65? */
- u.dblu_d *= 0x1p65;
- *decpt = u.dblu_dbl.dbl_exp - (65 + DBL_ADJ);
-#else
/* (DBL_MAX_EXP=1024 / 2) + 2 = 514? */
u.dblu_d *= 0x1p514;
*decpt = u.dblu_dbl.dbl_exp - (514 + DBL_ADJ);
-#endif
break;
case FP_INFINITE:
*decpt = INT_MAX;
@@ -177,6 +181,7 @@ hdtoa(double d, const char *xdigs, int n
case FP_NAN:
*decpt = INT_MAX;
return (nrv_alloc(NANSTR, rve, sizeof(NANSTR) - 1));
+#endif
default:
abort();
}
@@ -210,7 +215,8 @@ hdtoa(double d, const char *xdigs, int n
u.dblu_dbl.dbl_fracl >>= 4;
}
#ifdef DBL_FRACMBITS
- for (; s > s0; s--) {
+ for (; s > s0 + sigfigs - ((DBL_FRACLBITS + DBL_FRACMBITS) / 4) - 1
+ && s > s0; s--) {
*s = u.dblu_dbl.dbl_fracm & 0xf;
u.dblu_dbl.dbl_fracm >>= 4;
}
