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Check at runtime that fast inc/dec is possible.

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This commit is contained in:
Andreas Gal 2008-06-22 22:49:12 -07:00
parent 17d189ecb9
commit ab02df3893
1 changed files with 11 additions and 0 deletions
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11
js/src/jstracerinlines.h
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@ -566,6 +566,17 @@ static inline bool
guard_can_do_fast_inc_dec(JSContext* cx, JSFrameRegs& regs, jsval& v)
{
bool ok = interp_guard_can_do_fast_inc_dec(cx, regs, v);
/* to do a fast inc/dec the topmost two bits must be both 0 or 1 */
SideExit exit;
L.insGuard(G(ok),
L.ins2(LIR_eq,
L.ins2(LIR_and,
L.ins2(LIR_xor,
L.ins2(LIR_lsh, get(&v), L.insImm(1)),
get(&v)),
L.insImm(0x80000000)),
L.insImm(0)),
snapshot(cx, regs, exit));
return ok;
}