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core: equal2_p: Add short-circuit and eliminate tail call.

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* src/lib.c (equal2_p): Add short-circuit and eliminate tail call.
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Jan Nieuwenhuizen 2018-04-24 06:59:18 +02:00
parent 9936aa383b
commit 4fa6acc480
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GPG key ID: F3C1A0D9C1D65273
1 changed files with 16 additions and 5 deletions
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21
src/lib.c
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@ -293,14 +293,25 @@ memq (SCM x, SCM a)
SCM SCM
equal2_p (SCM a, SCM b) equal2_p (SCM a, SCM b)
{ {
if (a == cell_nil && b == cell_nil) equal2:
if (a == b)
return cell_t; return cell_t;
if (TYPE (a) == TPAIR && TYPE (b) == TPAIR) if (TYPE (a) == TPAIR && TYPE (b) == TPAIR)
return equal2_p (CAR (a), CAR (b)) == cell_t {
&& equal2_p (CDR (a), CDR (b)) == cell_t if (equal2_p (CAR (a), CAR (b)) == cell_t)
? cell_t : cell_f; {
a = CDR (a);
b = CDR (b);
goto equal2;
}
return cell_f;
}
if (TYPE (a) == TSTRING && TYPE (b) == TSTRING) if (TYPE (a) == TSTRING && TYPE (b) == TSTRING)
return equal2_p (STRING (a), STRING (b)); {
a = STRING (a);
b = STRING (b);
goto equal2;
}
if (TYPE (a) == TVECTOR && TYPE (b) == TVECTOR) if (TYPE (a) == TVECTOR && TYPE (b) == TVECTOR)
{ {
if (LENGTH (a) != LENGTH (b)) if (LENGTH (a) != LENGTH (b))