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Summary: Make sure RAGreedy informs LiveDebugVariables about new VRegs that is introduced at spill by InlineSpiller. Consider this example LDV: !"var" [48r;128r):0 Loc0=%2 48B %2 = ... ... 128B %7 = ADD %2, ... If %2 is spilled the InlineSpiller will insert spill/reload instructions and introduces some new vregs. So we get 48B %4 = ... 56B spill %4 ... 120B reload %5 128B %3 = ADD %5, ... In the past we did not inform LDV about this, and when reintroducing DBG_VALUE instruction LDV still got information that "var" had the location of the spilled register %2 for the interval [48r;128r). The result was bad, since we mapped "var" to the spill slot even before the spill happened: %4 = ... DBG_VALUE %spill.0, !"var" spill %4 to %spill.0 ... reload %5 %3 = ADD %5, ... This patch will inform LDV about the interval split introduced due to spilling. So the location map in LDV will become !"var" [48r;56r):1 [56r;120r):0 [120r;128r):2 Loc0=%2 Loc1=%4 Loc2=%5 And when inserting DBG_VALUE instructions we get %4 = ... DBG_VALUE %4, !"var" spill %4 to %spill.0 DBG_VALUE %spill.0, !"var" ... reload %5 DBG_VALUE %5, !"var" %3 = ADD %5, ... Fixes: https://bugs.llvm.org/show_bug.cgi?id=38899 Reviewers: jmorse, vsk, aprantl Reviewed By: jmorse Subscribers: dstenb, wuzish, MatzeB, qcolombet, nemanjai, hiraditya, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D69584
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