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Cherry-pick a fix for LLVM issue 40289 #135
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In r345197 ESP and RSP were added to GR32_TC/GR64_TC, allowing them to be used for tail calls, but this also caused `findDeadCallerSavedReg` to think they were acceptable targets for clobbering. Filter them out. Fixes PR40289.
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FWIW, I plan to rebase rust-lang/llvm-project#1 when LLVM branches 8.x tomorrow, which should include this patch. |
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👍 to both! |
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See https://bugs.llvm.org/show_bug.cgi?id=40289 / https://reviews.llvm.org/rL351146.