tree 8767884a55162f9398e5f71b76ae896ffab2ca1c
parent 471e1bdee3324af3559ee7ef124cd6e3e38bdcd1
author Steven Wu <stevenwu@apple.com> 1777902190 -0700
committer GitHub <noreply@github.com> 1777902190 -0700
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[CodeExtractor] Reset stale FuncRetVal in findInputsOutputs (#195484)

HotColdSplitting calls findInputsOutputs once for cost analysis before
extractCodeRegion runs normalizeCFGForExtraction. The first call may set
FuncRetVal to a single-output value which severSplitPHINodesOfEntry then
moves back into the parent function. The second findInputsOutputs call
correctly finds zero outputs but leaves FuncRetVal pointing at the
parent's instruction, so the cold function emits a `ret` referencing a
value in another function and fails verification.

Reset FuncRetVal at the start of the selection block so each call
recomputes it from the current CFG.

rdar://176075761