stan/jdk-24
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7192964: assert(false) failed: bad AD file

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Shifts with loop variant counts "a[i]=1<<b[i];" should not be vectorized since hw does not support it.

Reviewed-by: twisti
This commit is contained in:
Vladimir Kozlov 2012-08-21 14:50:02 -07:00
parent a14e902e92
commit ef4102148a
2 changed files with 6 additions and 2 deletions
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4
hotspot/src/share/vm/opto/superword.cpp
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@ -1055,6 +1055,9 @@ void SuperWord::filter_packs() {
// Can code be generated for pack p?
bool SuperWord::implemented(Node_List* p) {
Node* p0 = p->at(0);
if (VectorNode::is_shift(p0) && in_bb(p0->in(2))) {
return false; // vector shift count should be loop's invariant.
}
return VectorNode::implemented(p0->Opcode(), p->size(), velt_basic_type(p0));
}
@ -1404,6 +1407,7 @@ Node* SuperWord::vector_opd(Node_List* p, int opd_idx) {
if (same_opd) {
if (opd->is_Vector() || opd->is_LoadVector()) {
assert(((opd_idx != 2) || !VectorNode::is_shift(p0)), "shift's count can't be vector");
return opd; // input is matching vector
}
if ((opd_idx == 2) && VectorNode::is_shift(p0)) {

4
hotspot/src/share/vm/opto/vectornode.cpp
View File

@ -180,9 +180,9 @@ bool VectorNode::is_shift(Node* n) {
return false;
}
// Check if input is loop invarient vector.
// Check if input is loop invariant vector.
bool VectorNode::is_invariant_vector(Node* n) {
// Only Replicate vector nodes are loop invarient for now.
// Only Replicate vector nodes are loop invariant for now.
switch (n->Opcode()) {
case Op_ReplicateB:
case Op_ReplicateS: