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VM: ash: Use SCM_SRS and handle large right shift in fast path.

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* libguile/vm-i-scheme.c (ash): Use SCM_SRS.  Handle inum right shift by
  more than SCM_I_FIXNUM_BIT-1 bits in fast path.
This commit is contained in:
Mark H Weaver 2013-08-06 16:38:32 -04:00
parent 19374ad2de
commit ca7b6f6869
1 changed files with 5 additions and 6 deletions
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9
libguile/vm-i-scheme.c
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@ -486,12 +486,11 @@ VM_DEFINE_FUNCTION (159, ash, "ash", 2)
if (SCM_I_INUMP (x) && SCM_I_INUMP (y))
{
if (SCM_I_INUM (y) < 0)
{
/* Right shift, will be a fixnum. */
if (SCM_I_INUM (y) > -SCM_I_FIXNUM_BIT)
RETURN (SCM_I_MAKINUM (SCM_I_INUM (x) >> -SCM_I_INUM (y)));
/* fall through */
}
RETURN (SCM_I_MAKINUM
(SCM_SRS (SCM_I_INUM (x),
(-SCM_I_INUM (y) <= SCM_I_FIXNUM_BIT-1)
? -SCM_I_INUM (y) : SCM_I_FIXNUM_BIT-1)));
else
/* Left shift. See comments in scm_ash. */
{