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Add minimal set of fold rules for KINT64.

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Mike Pall 2010-12-06 00:38:21 +01:00
parent 588fa0481f
commit 281f426d60
1 changed files with 19 additions and 0 deletions
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19
src/lj_opt_fold.c
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@ -661,6 +661,25 @@ LJFOLDF(simplify_intsub_k)
return RETRYFOLD; return RETRYFOLD;
} }
LJFOLD(ADD any KINT64)
LJFOLDF(simplify_intadd_k64)
{
if (ir_kint64(fright)->u64 == 0) /* i + 0 ==> i */
return LEFTFOLD;
return NEXTFOLD;
}
LJFOLD(SUB any KINT64)
LJFOLDF(simplify_intsub_k64)
{
uint64_t k = ir_kint64(fright)->u64;
if (k == 0) /* i - 0 ==> i */
return LEFTFOLD;
fins->o = IR_ADD; /* i - k ==> i + (-k) */
fins->op2 = (IRRef1)lj_ir_kint64(J, -k); /* Overflow for -2^63 ok. */
return RETRYFOLD;
}
LJFOLD(SUB any any) LJFOLD(SUB any any)
LJFOLD(SUBOV any any) LJFOLD(SUBOV any any)
LJFOLDF(simplify_intsub) LJFOLDF(simplify_intsub)