1cd92e480c
Fix a bug where UnwindAssemblyInstEmulation would confuse which register is used to compute the Canonical Frame Address after it had branched over a mid-function epilogue (where the CFA reg changes from $fp to $sp in the process of epiloguing). Reinstate the correct CFA register after we forward the unwind rule for branch targets. The failure mode was that UnwindAssemblyInstEmulation would think CFA was set in terms of $sp after one of these epilogues, and if it sees modifications to $sp after the branch target, it would change the CFA offset in the unwind rule -- even though the CFA is defined in terms of $fp and the $sp changes are irrelevant to correct calculation. <rdar://problem/60300528> Differential Revision: https://reviews.llvm.org/D78077 |
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