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complex.c: sign of zeros

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* complex.c (rb_nucomp_mul): preserve sign of zeros without NaN by
  regularized values.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49757 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-02-25 17:05:26 +00:00
parent 694d6f27cd
commit 41b2f1ada4
1 changed files with 26 additions and 12 deletions
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38
complex.c
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@ -19,6 +19,10 @@
#define ONE INT2FIX(1)
#define TWO INT2FIX(2)
#define RFLOAT_0 DBL2NUM(0)
#if defined(HAVE_SIGNBIT) && defined(__GNUC__) && defined(__sun) && \
!defined(signbit)
extern int signbit(double);
#endif
VALUE rb_cComplex;
@ -739,6 +743,19 @@ nucomp_sub(VALUE self, VALUE other)
return f_addsub(self, other, f_sub, '-');
}
static VALUE
safe_mul(VALUE a, VALUE b, int az, int bz)
{
double v;
if (!az && bz && RB_FLOAT_TYPE_P(a) && !isnan(v = RFLOAT_VALUE(a))) {
a = signbit(v) ? DBL2NUM(-1.0) : DBL2NUM(1.0);
}
if (!bz && az && RB_FLOAT_TYPE_P(b) && !isnan(v = RFLOAT_VALUE(b))) {
b = signbit(v) ? DBL2NUM(-1.0) : DBL2NUM(1.0);
}
return f_mul(a, b);
}
/*
* call-seq:
* cmp * numeric -> complex
@ -757,17 +774,18 @@ rb_nucomp_mul(VALUE self, VALUE other)
if (k_complex_p(other)) {
VALUE real, imag;
VALUE areal, aimag, breal, bimag;
int arzero, aizero, brzero, bizero;
get_dat2(self, other);
if (f_zero_p(areal = adat->real)) areal = ZERO;
if (f_zero_p(aimag = adat->imag)) aimag = ZERO;
if (f_zero_p(breal = bdat->real)) breal = ZERO;
if (f_zero_p(bimag = bdat->imag)) bimag = ZERO;
real = (areal == ZERO || breal == ZERO) ? ZERO : f_mul(areal, breal);
if (aimag != ZERO && bimag != ZERO) real = f_sub(real, f_mul(aimag, bimag));
imag = (areal == ZERO || bimag == ZERO) ? ZERO : f_mul(areal, bimag);
if (aimag != ZERO && breal != ZERO) imag = f_add(imag, f_mul(aimag, breal));
arzero = !!f_zero_p(areal = adat->real);
aizero = !!f_zero_p(aimag = adat->imag);
brzero = !!f_zero_p(breal = bdat->real);
bizero = !!f_zero_p(bimag = bdat->imag);
real = f_sub(safe_mul(areal, breal, arzero, brzero),
safe_mul(aimag, bimag, aizero, bizero));
imag = f_add(safe_mul(areal, bimag, arzero, bizero),
safe_mul(aimag, breal, aizero, brzero));
return f_complex_new2(CLASS_OF(self), real, imag);
}
@ -1238,10 +1256,6 @@ nucomp_eql_p(VALUE self, VALUE other)
inline static VALUE
f_signbit(VALUE x)
{
#if defined(HAVE_SIGNBIT) && defined(__GNUC__) && defined(__sun) && \
!defined(signbit)
extern int signbit(double);
#endif
if (RB_TYPE_P(x, T_FLOAT)) {
double f = RFLOAT_VALUE(x);
return f_boolcast(!isnan(f) && signbit(f));