[llvm-bugs] [Bug 42611] New: mergefunc crashes with "opt -newgvn -ipsccp -mergefunc": Assertion `getKindAsEnum() != AI.getKindAsEnum() && "Comparison of types would be unstable"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42611

            Bug ID: 42611
           Summary: mergefunc crashes with "opt -newgvn -ipsccp
                    -mergefunc": Assertion `getKindAsEnum() !=
                    AI.getKindAsEnum() && "Comparison of types would be
                    unstable"' failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22239
  --> https://bugs.llvm.org/attachment.cgi?id=22239&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c

$opt -newgvn -ipsccp -mergefunc small.bc -o small-opt.bc
opt: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/IR/Attributes.cpp:553:
bool llvm::AttributeImpl::operator<(const llvm::AttributeImpl&) const:
Assertion `getKindAsEnum() != AI.getKindAsEnum() && "Comparison of types would
be unstable"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt -newgvn -ipsccp
-mergefunc small.bc -o small-opt.bc 
1.      Running pass 'Merge Functions' on module 'small.bc'.
 #0 0x000055fc1227887a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x257887a)
 #1 0x000055fc12276534 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2576534)
 #2 0x000055fc12276672 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2576672)
 #3 0x00007fbcceb47890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fbccd7f9e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fbccd7fb801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fbccd7eb39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fbccd7eb412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055fc11b4062e llvm::AttributeImpl::operator<(llvm::AttributeImpl
const&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1e4062e)
 #9 0x000055fc122d566c llvm::FunctionComparator::cmpAttrs(llvm::AttributeList,
llvm::AttributeList) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x25d566c)
#10 0x000055fc122d9573 llvm::FunctionComparator::compareSignature() const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x25d9573)
#11 0x000055fc122da732 llvm::FunctionComparator::compare()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x25da732)
#12 0x000055fc11d4d17b (anonymous
namespace)::MergeFunctions::runOnModule(llvm::Module&) (.part.427)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x204d17b)
#13 0x000055fc11c303e1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1f303e1)
#14 0x000055fc105190a9 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x8190a9)
#15 0x00007fbccd7dcb97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x000055fc1059e3fa _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x89e3fa)
Aborted (core dumped)

-------------------------------------
struct a {
  long b;
  short c;
  long d;
};
static int e(struct a f, struct a g, struct a h, long i, short j) { return 0; }
static int k(struct a l, int m, short n, int o, short p) {
  for (;;)
    ;
}

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