[llvm-bugs] [Bug 50825] New: ICE: fatal error: error in backend: Stack empty?? on invalid embedded asm code.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50825

            Bug ID: 50825
           Summary: ICE: fatal error: error in backend: Stack empty?? on
                    invalid embedded asm code.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: cnsun at uwaterloo.ca
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

$ clang-trunk -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
5c8659801a4976ef2b327f4071d98086efd42a36)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$ cat mutant.c
x(long double x) { asm("# %0" : "+fm"(x)); }

$ clang-trunk  mutant.c
mutant.c:1:1: warning: type specifier missing, defaults to 'int'
[-Wimplicit-int]
x(long double x) { asm("# %0" : "+fm"(x)); }
^
mutant.c:1:44: warning: non-void function does not return a value
[-Wreturn-type]
x(long double x) { asm("# %0" : "+fm"(x)); }
                                           ^
fatal error: error in backend: Stack empty??
clang-13: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
5c8659801a4976ef2b327f4071d98086efd42a36)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cnsun/usr/bin
clang-13: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/mutant-d447f9.c
clang-13: note: diagnostic msg: /tmp/mutant-d447f9.sh
clang-13: note: diagnostic msg:

********************

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