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Refactoring of conversion ops, part 1: add IR_CONV.

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Mike Pall
2010-12-28 22:05:40 +01:00
parent 06c61d9cea
commit 2ca2de7f0e
5 changed files with 142 additions and 1 deletions
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22
src/lj_opt_fold.c
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@@ -771,6 +771,28 @@ LJFOLDF(cse_toint)
return EMITFOLD; /* No fallthrough to regular CSE. */
}
/* Special CSE rule for CONV. */
LJFOLD(CONV any any)
LJFOLDF(cse_conv)
{
if (LJ_LIKELY(J->flags & JIT_F_OPT_CSE)) {
IRRef op1 = fins->op1, op2 = (fins->op2 & IRCONV_MODEMASK);
uint8_t guard = irt_isguard(fins->t);
IRRef ref = J->chain[IR_CONV];
while (ref > op1) {
IRIns *ir = IR(ref);
/* CSE also depends on the target type!
** OTOH commoning with stronger checks is ok, too.
*/
if (ir->op1 == op1 && irt_sametype(ir->t, fins->t) &&
(ir->op2 & IRCONV_MODEMASK) == op2 && irt_isguard(ir->t) >= guard)
return ref;
ref = ir->prev;
}
}
return EMITFOLD; /* No fallthrough to regular CSE. */
}
/* -- Strength reduction of widening -------------------------------------- */
LJFOLD(TOI64 any 3) /* IRTOINT_ZEXT64 */