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Add a pattern to recognize safe_add and emit a simple add for it.

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This commit is contained in:
Andreas Gal 2008-07-21 19:37:43 -07:00
parent 2d2bcf0fc8
commit 9b799905ed
1 changed files with 30 additions and 0 deletions
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30
js/src/jstracer.cpp
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@ -226,6 +226,11 @@ static bool isPromote(LIns* i)
return isPromoteInt(i) || isPromoteUint(i);
}
static bool isconst(LIns* i, int32_t c)
{
return i->isconst() && i->constval() == c;
}
static bool overflowSafe(LIns* i)
{
LIns* c;
@ -299,6 +304,31 @@ public:
out->insGuard(LIR_xt, out->ins1(LIR_ov, result), recorder.snapshot());
return out->ins1(LIR_i2f, result);
}
} else if (v == LIR_or &&
s0->isop(LIR_lsh) && isconst(s0->oprnd2(), 16) &&
s1->isop(LIR_and) && isconst(s1->oprnd2(), 0xffff)) {
LIns* msw = s0->oprnd1();
LIns* lsw = s1->oprnd1();
LIns* x;
LIns* y;
if (lsw->isop(LIR_add) &&
lsw->oprnd1()->isop(LIR_and) &&
lsw->oprnd2()->isop(LIR_and) &&
isconst(lsw->oprnd1()->oprnd2(), 0xffff) &&
isconst(lsw->oprnd2()->oprnd2(), 0xffff) &&
msw->isop(LIR_add) &&
msw->oprnd1()->isop(LIR_add) &&
msw->oprnd2()->isop(LIR_rsh) &&
msw->oprnd1()->oprnd1()->isop(LIR_rsh) &&
msw->oprnd1()->oprnd2()->isop(LIR_rsh) &&
isconst(msw->oprnd2()->oprnd2(), 16) &&
isconst(msw->oprnd1()->oprnd1()->oprnd2(), 16) &&
isconst(msw->oprnd1()->oprnd2()->oprnd2(), 16) &&
(x = lsw->oprnd1()->oprnd1()) == msw->oprnd1()->oprnd1()->oprnd1() &&
(y = lsw->oprnd2()->oprnd1()) == msw->oprnd1()->oprnd2()->oprnd1() &&
lsw == msw->oprnd2()->oprnd1()) {
return out->ins2(LIR_add, x, y);
}
}
return out->ins2(v, s0, s1);
}