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DUALNUM: Make overflow guards weak. Add IR_USE and IR_MULOV.

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Mike Pall
2011-03-07 20:21:38 +01:00
parent a30f58b54b
commit 54978e481b
4 changed files with 40 additions and 4 deletions
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5
src/lj_record.c
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@@ -1860,8 +1860,9 @@ static void rec_setup_forl(jit_State *J, const BCIns *fori)
emitir(IRTGI(IR_GE), step, lj_ir_kint(J, (int32_t)0x80000000-k));
}
} else {
/* Stop+step variable: need full overflow check (with dead result). */
emitir(IRTGI(IR_ADDOV), step, stop);
/* Stop+step variable: need full overflow check. */
TRef tr = emitir(IRTGI(IR_ADDOV), step, stop);
emitir(IRTI(IR_USE), tr, 0); /* ADDOV is weak. Avoid dead result. */
}
}
} else if (t == IRT_INT && !tref_isk(stop)) {