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Simplify scm_abs for the real case

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* libguile/numbers.c (scm_abs): As stated. When x is a nan with the sign bit
  set, this changes the behavior of (magnitude x) back to what it was in 3.0.7,
  to clear that bit.
This commit is contained in:
Daniel Llorens 2022-01-10 12:21:26 +01:00 • committed by Andy Wingo
parent 9e5aa173c7
commit 6058d9e05d
1 changed files with 1 additions and 11 deletions
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12
libguile/numbers.c
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@ -658,17 +658,7 @@ SCM_PRIMITIVE_GENERIC (scm_abs, "abs", 1, 0, 0,
if (SCM_I_INUMP (x)) if (SCM_I_INUMP (x))
return scm_integer_abs_i (SCM_I_INUM (x)); return scm_integer_abs_i (SCM_I_INUM (x));
else if (SCM_LIKELY (SCM_REALP (x))) else if (SCM_LIKELY (SCM_REALP (x)))
{ return scm_i_from_double (copysign (SCM_REAL_VALUE (x), 1.0));
double xx = SCM_REAL_VALUE (x);
/* If x is a NaN then xx<0 is false so we return x unchanged */
if (xx < 0.0)
return scm_i_from_double (-xx);
/* Handle signed zeroes properly */
else if (SCM_UNLIKELY (xx == 0.0))
return flo0;
else
return x;
}
else if (SCM_BIGP (x)) else if (SCM_BIGP (x))
return scm_integer_abs_z (scm_bignum (x)); return scm_integer_abs_z (scm_bignum (x));
else if (SCM_FRACTIONP (x)) else if (SCM_FRACTIONP (x))