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04fb9b7 fixes a miscompile in AArch64 debug builds using GlobalISel, where previously nonsensical mrs NZCV instructions were inserted (originally reported at rust-lang/rust#92786).
The patch does not apply cleanly to 13.x, I have rebased it here: nikic@1715dad Notably the test output in the truncating_f8 test is slightly different, there are three COPYs on 13.x rather than two. I'm not sure whether that is okay or indicative of a problem (maybe @aemerson can confirm).
If it's too late for the 13.0.1 release, we'll carry this patch on the rustc side.
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llvmbot commentedon Jan 14, 2022
@llvm/issue-subscribers-backend-AArch64
tstellar commentedon Jan 14, 2022
@TNorthover What do you think about this?
TNorthover commentedon Jan 19, 2022
Yep, I think this one is good too.
nikic commentedon Jan 25, 2022
Removing this as a backport candidate -- this failed rustc aarch64 testing with:
So probably this patch has some other dependency on the main branch, but I haven't figure out what it is yet.