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2012083871
Summary: computeRegisterLiveness and analyzePhysReg are currently getting confused about liveness in some cases, breaking copyPhysReg's calculation of whether AX is dead in some cases. Work around this issue temporarily by assuming that AX is always live. See detail in: https://llvm.org/bugs/show_bug.cgi?id=25033#c7 And associated bugs PR24535 PR25033 PR24991 PR24992 PR25201. This workaround makes the code correct but slightly inefficient, but it seems to confuse the machine instr verifier which now things EAX was undefined in some cases where it's being conservatively saved / restored. Reviewers: majnemer, sanjoy Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D15198 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254680 91177308-0d34-0410-b5e6-96231b3b80d8
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