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8270533: AArch64: size_fits_all_mem_uses should return false if its output is a CAS

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Reviewed-by: adinn, ngasson
This commit is contained in:
Andrew Haley 2021-09-08 10:08:30 +00:00
parent a66629a464
commit 6750c34c92
1 changed files with 7 additions and 0 deletions
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src/hotspot/cpu/aarch64/aarch64.ad
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@ -2642,6 +2642,13 @@ const RegMask Matcher::method_handle_invoke_SP_save_mask() {
bool size_fits_all_mem_uses(AddPNode* addp, int shift) {
for (DUIterator_Fast imax, i = addp->fast_outs(imax); i < imax; i++) {
Node* u = addp->fast_out(i);
if (u->is_LoadStore()) {
// On AArch64, LoadStoreNodes (i.e. compare and swap
// instructions) only take register indirect as an operand, so
// any attempt to use an AddPNode as an input to a LoadStoreNode
// must fail.
return false;
}
if (u->is_Mem()) {
int opsize = u->as_Mem()->memory_size();
assert(opsize > 0, "unexpected memory operand size");