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4a17b3df7a
swifterror llvm values model the swifterror register as memory at the LLVM IR level. ISel will perform adhoc mem-to-reg on them. swifterror values are constraint in how they can be used. Spilling them to memory is not allowed. SjLjEHPrepare tried to lower swifterror values to memory which is unecessary since the back-end will spill and reload the register as neccessary (as long as clobbering calls are marked as such which is the case here) and further leads to invalid IR because swifterror values can't be stored to memory. rdar://38164004 llvm-svn: 327521 |
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