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DUALNUM: Narrow unary minus.

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This commit is contained in:
Mike Pall
2011-03-15 17:56:55 +01:00
parent a226fb4cc7
commit dcbae09b1d
4 changed files with 30 additions and 3 deletions
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15
src/lj_opt_narrow.c
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@@ -535,6 +535,21 @@ TRef lj_opt_narrow_arith(jit_State *J, TRef rb, TRef rc,
return emitir(IRTN(op), rb, rc);
}
/* Narrowing of unary minus operator. */
TRef lj_opt_narrow_unm(jit_State *J, TRef rc, TValue *vc)
{
if (tref_isstr(rc)) {
rc = emitir(IRTG(IR_STRTO, IRT_NUM), rc, 0);
lj_str_tonum(strV(vc), vc);
}
if (tref_isinteger(rc)) {
if ((uint32_t)numberVint(vc) != 0x80000000u)
return emitir(IRTGI(IR_SUBOV), lj_ir_kint(J, 0), rc);
rc = emitir(IRTN(IR_CONV), rc, IRCONV_NUM_INT);
}
return emitir(IRTN(IR_NEG), rc, lj_ir_knum_neg(J));
}
/* Narrowing of modulo operator. */
TRef lj_opt_narrow_mod(jit_State *J, TRef rb, TRef rc)
{