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8284742: x86: Handle integral division overflow during parsing

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Reviewed-by: kvn, mdoerr
This commit is contained in:
Quan Anh Mai 2022-04-20 16:17:01 +00:00 • committed by Vladimir Kozlov
parent 5291ec8d56
commit b4a85cdae1
24 changed files with 648 additions and 378 deletions
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40
src/hotspot/share/opto/compile.cpp
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@ -3529,6 +3529,46 @@ void Compile::final_graph_reshaping_main_switch(Node* n, Final_Reshape_Counts& f
}
break;
case Op_NoOvfModI:
if (UseDivMod) {
// Check if a%b and a/b both exist
Node* d = n->find_similar(Op_NoOvfDivI);
if (d) {
// Replace them with a fused divmod if supported
if (Matcher::has_match_rule(Op_NoOvfDivModI)) {
NoOvfDivModINode* divmod = NoOvfDivModINode::make(n);
d->subsume_by(divmod->div_proj(), this);
n->subsume_by(divmod->mod_proj(), this);
} else {
// replace a%b with a-((a/b)*b)
Node* mult = new MulINode(d, d->in(2));
Node* sub = new SubINode(d->in(1), mult);
n->subsume_by(sub, this);
}
}
}
break;
case Op_NoOvfModL:
if (UseDivMod) {
// Check if a%b and a/b both exist
Node* d = n->find_similar(Op_NoOvfDivL);
if (d) {
// Replace them with a fused divmod if supported
if (Matcher::has_match_rule(Op_NoOvfDivModL)) {
NoOvfDivModLNode* divmod = NoOvfDivModLNode::make(n);
d->subsume_by(divmod->div_proj(), this);
n->subsume_by(divmod->mod_proj(), this);
} else {
// replace a%b with a-((a/b)*b)
Node* mult = new MulLNode(d, d->in(2));
Node* sub = new SubLNode(d->in(1), mult);
n->subsume_by(sub, this);
}
}
}
break;
case Op_LoadVector:
case Op_StoreVector:
case Op_LoadVectorGather: