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* util.c: suppress strict-aliasing warning with gcc-4.4.0 -O2 to fix 

infinite loop by ruby -e "1.402e-45" .


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@23353 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2009-05-06 17:02:29 +00:00
parent c38db982ab
commit b5898e70b0
2 changed files with 48 additions and 32 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Thu May 7 01:59:35 2009 Tanaka Akira <akr@fsij.org>
* util.c: suppress strict-aliasing warning with gcc-4.4.0 -O2 to fix
infinite loop by ruby -e "1.402e-45" .
Wed May 6 09:27:04 2009 Nobuyoshi Nakada <nobu@ruby-lang.org>
* README.ja: code for THINK_C does not exist already. [Bug #1435]

75
util.c
View File

@ -956,23 +956,25 @@ Exactly one of IEEE_LITTLE_ENDIAN, IEEE_BIG_ENDIAN, VAX, or IBM should be define
typedef union { double d; ULong L[2]; } U;
#ifdef YES_ALIAS
#define dval(x) x
#ifdef IEEE_LITTLE_ENDIAN
#define word0(x) ((ULong *)&x)[1]
#define word1(x) ((ULong *)&x)[0]
typedef double double_u;
# define dval(x) x
# ifdef IEEE_LITTLE_ENDIAN
# define word0(x) (((ULong *)&x)[1])
# define word1(x) (((ULong *)&x)[0])
# else
# define word0(x) (((ULong *)&x)[0])
# define word1(x) (((ULong *)&x)[1])
# endif
#else
#define word0(x) ((ULong *)&x)[0]
#define word1(x) ((ULong *)&x)[1]
#endif
#else
#ifdef IEEE_LITTLE_ENDIAN
#define word0(x) ((U*)&x)->L[1]
#define word1(x) ((U*)&x)->L[0]
#else
#define word0(x) ((U*)&x)->L[0]
#define word1(x) ((U*)&x)->L[1]
#endif
#define dval(x) ((U*)&x)->d
typedef U double_u;
# ifdef IEEE_LITTLE_ENDIAN
# define word0(x) (x.L[1])
# define word1(x) (x.L[0])
# else
# define word0(x) (x.L[0])
# define word1(x) (x.L[1])
# endif
# define dval(x) (x.d)
#endif
/* The following definition of Storeinc is appropriate for MIPS processors.
@ -1702,10 +1704,11 @@ diff(Bigint *a, Bigint *b)
}
static double
ulp(double x)
ulp(double x_)
{
register Long L;
double a;
double_u x, a;
dval(x) = x_;
L = (word0(x) & Exp_mask) - (P-1)*Exp_msk1;
#ifndef Avoid_Underflow
@ -1743,7 +1746,7 @@ b2d(Bigint *a, int *e)
{
ULong *xa, *xa0, w, y, z;
int k;
double d;
double_u d;
#ifdef VAX
ULong d0, d1;
#else
@ -1804,8 +1807,9 @@ ret_d:
}
static Bigint *
d2b(double d, int *e, int *bits)
d2b(double d_, int *e, int *bits)
{
double_u d;
Bigint *b;
int de, k;
ULong *x, y, z;
@ -1814,6 +1818,9 @@ d2b(double d, int *e, int *bits)
#endif
#ifdef VAX
ULong d0, d1;
#endif
dval(d) = d_;
#ifdef VAX
d0 = word0(d) >> 16 | word0(d) << 16;
d1 = word1(d) >> 16 | word1(d) << 16;
#else
@ -1939,7 +1946,7 @@ d2b(double d, int *e, int *bits)
static double
ratio(Bigint *a, Bigint *b)
{
double da, db;
double_u da, db;
int k, ka, kb;
dval(da) = b2d(a, &ka);
@ -2098,7 +2105,8 @@ ruby_strtod(const char *s00, char **se)
int bb2, bb5, bbe, bd2, bd5, bbbits, bs2, c, dsign,
e, e1, esign, i, j, k, nd, nd0, nf, nz, nz0, sign;
const char *s, *s0, *s1;
double aadj, aadj1, adj, rv, rv0;
double aadj, adj;
double_u aadj1, rv, rv0;
Long L;
ULong y, z;
Bigint *bb, *bb1, *bd, *bd0, *bs, *delta;
@ -2797,14 +2805,14 @@ drop_down:
}
if ((aadj = ratio(delta, bs)) <= 2.) {
if (dsign)
aadj = aadj1 = 1.;
aadj = dval(aadj1) = 1.;
else if (word1(rv) || word0(rv) & Bndry_mask) {
#ifndef Sudden_Underflow
if (word1(rv) == Tiny1 && !word0(rv))
goto undfl;
#endif
aadj = 1.;
aadj1 = -1.;
dval(aadj1) = -1.;
}
else {
/* special case -- power of FLT_RADIX to be */
@ -2814,12 +2822,12 @@ drop_down:
aadj = 1./FLT_RADIX;
else
aadj *= 0.5;
aadj1 = -aadj;
dval(aadj1) = -aadj;
}
}
else {
aadj *= 0.5;
aadj1 = dsign ? aadj : -aadj;
dval(aadj1) = dsign ? aadj : -aadj;
#ifdef Check_FLT_ROUNDS
switch (Rounding) {
case 2: /* towards +infinity */
@ -2831,7 +2839,7 @@ drop_down:
}
#else
if (Flt_Rounds == 0)
aadj1 += 0.5;
dval(aadj1) += 0.5;
#endif /*Check_FLT_ROUNDS*/
}
y = word0(rv) & Exp_mask;
@ -2841,7 +2849,7 @@ drop_down:
if (y == Exp_msk1*(DBL_MAX_EXP+Bias-1)) {
dval(rv0) = dval(rv);
word0(rv) -= P*Exp_msk1;
adj = aadj1 * ulp(dval(rv));
adj = dval(aadj1) * ulp(dval(rv));
dval(rv) += adj;
if ((word0(rv) & Exp_mask) >=
Exp_msk1*(DBL_MAX_EXP+Bias-P)) {
@ -2861,11 +2869,11 @@ drop_down:
if ((z = aadj) <= 0)
z = 1;
aadj = z;
aadj1 = dsign ? aadj : -aadj;
dval(aadj1) = dsign ? aadj : -aadj;
}
word0(aadj1) += (2*P+1)*Exp_msk1 - y;
}
adj = aadj1 * ulp(dval(rv));
adj = dval(aadj1) * ulp(dval(rv));
dval(rv) += adj;
#else
#ifdef Sudden_Underflow
@ -3178,7 +3186,7 @@ freedtoa(char *s)
*/
char *
dtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve)
dtoa(double d_, int mode, int ndigits, int *decpt, int *sign, char **rve)
{
/* Arguments ndigits, decpt, sign are similar to those
of ecvt and fcvt; trailing zeros are suppressed from
@ -3223,7 +3231,8 @@ dtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve)
ULong x;
#endif
Bigint *b, *b1, *delta, *mlo = 0, *mhi = 0, *S;
double d2, ds, eps;
double ds;
double_u d, d2, eps;
char *s, *s0;
#ifdef Honor_FLT_ROUNDS
int rounding;
@ -3232,6 +3241,8 @@ dtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve)
int inexact, oldinexact;
#endif
dval(d) = d_;
#ifndef MULTIPLE_THREADS
if (dtoa_result) {
freedtoa(dtoa_result);