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JIT: disable phi based redundant branch opts #76695

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Oct 6, 2022
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JIT: disable phi based redundant branch opts #76695

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7 changes: 6 additions & 1 deletion src/coreclr/jit/redundantbranchopts.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -657,7 +657,12 @@ bool Compiler::optRedundantBranch(BasicBlock* const block)
// We were unable to determine the relop value via dominance checks.
// See if we can jump thread via phi disambiguation.
//
return optJumpThreadPhi(block, tree, treeNormVN);
// optJumpThreadPhi disabled as it is exposing problems with stale SSA.
// See issue #76636 and related.
//
// return optJumpThreadPhi(block, tree, treeNormVN);

return false;
}

// Be conservative if there is an exception effect and we're in an EH region
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