[llvm-bugs] [Bug 49870] New: rG31d219d2997f hangs when compiling the Linux kernel

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49870

            Bug ID: 49870
           Summary: rG31d219d2997f hangs when compiling the Linux kernel
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: lebedev.ri at gmail.com
          Reporter: samitolvanen at google.com
                CC: llvm-bugs at lists.llvm.org, ndesaulniers at google.com

Created attachment 24725
  --> https://bugs.llvm.org/attachment.cgi?id=24725&action=edit
Preprocessed x86-stub.c

After commit 31d219d2997fed1b7dc97e0adf170d5aaf65883e, Clang hangs when
compiling the Linux kernel, specifically the file
drivers/firmware/efi/libstub/x86-stub.c:

https://reviews.llvm.org/rG31d219d2997fed1b7dc97e0adf170d5aaf65883e

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/firmware/efi/libstub/x86-stub.c

I've attached the preprocessed source file, and you can reproduce the issue by
running:

$ clang -nostdinc -m64 -fPIC -fno-strict-aliasing -mno-red-zone -mno-mmx
-mno-sse -fshort-wchar -Wno-pointer-sign -Wno-address-of-packed-member -Wno-gnu
-fno-asynchronous-unwind-tables -Os -ffreestanding -fno-stack-protector
-fno-addrsig -c x86-stub.c

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