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FFI: Fix pseudo type conversions for type punning.

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This commit is contained in:
Mike Pall 2014-03-28 19:09:45 +01:00
parent 095344ce7c
commit c735293921
1 changed files with 9 additions and 11 deletions
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20
src/lj_opt_mem.c
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@ -740,21 +740,19 @@ retry:
case ALIAS_MUST:
/* Emit conversion if the loaded type doesn't match the forwarded type. */
if (!irt_sametype(fins->t, IR(store->op2)->t)) {
IRType st = irt_type(fins->t);
if (st == IRT_I8 || st == IRT_I16) { /* Trunc + sign-extend. */
st |= IRCONV_SEXT;
} else if (st == IRT_U8 || st == IRT_U16) { /* Trunc + zero-extend. */
} else if (st == IRT_INT) {
st = irt_type(IR(store->op2)->t); /* Needs dummy CONV.int.*. */
} else { /* I64/U64 are boxed, U32 is hidden behind a CONV.num.u32. */
goto store_fwd;
IRType dt = irt_type(fins->t), st = irt_type(IR(store->op2)->t);
if (dt == IRT_I8 || dt == IRT_I16) { /* Trunc + sign-extend. */
st = dt | IRCONV_SEXT;
dt = IRT_INT;
} else if (dt == IRT_U8 || dt == IRT_U16) { /* Trunc + zero-extend. */
st = dt;
dt = IRT_INT;
}
fins->ot = IRTI(IR_CONV);
fins->ot = IRT(IR_CONV, dt);
fins->op1 = store->op2;
fins->op2 = (IRT_INT<<5)|st;
fins->op2 = (dt<<5)|st;
return RETRYFOLD;
}
store_fwd:
return store->op2; /* Store forwarding. */
}
ref = store->prev;