[llvm-bugs] [Bug 44236] New: mergefunc makes function broken: Attribute 'byval' type does not match parameter

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44236

            Bug ID: 44236
           Summary: mergefunc makes function broken: Attribute 'byval'
                    type does not match parameter
           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 22910
  --> https://bugs.llvm.org/attachment.cgi?id=22910&action=edit
small.bc

$clang -v
clang version 10.0.0 (https://github.com/llvm/llvm-project.git
759909506c2b557b9bc5cd3883970dea48e0b86b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/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 -mergefunc small.bc 
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

Attribute 'byval' type does not match parameter!
  call void bitcast (void (%struct.a*, %struct.a*)* @e to void (%struct.c*,
%struct.c*)*)(%struct.c* noalias sret %tmp, %struct.c* byval(%struct.a) align
16 @d)
in function h
LLVM ERROR: Broken function found, compilation aborted!

-----------------------------
struct c {
  int : 12, : 11, : 9;
  long double b;
} d;
struct a {
  int : 12, : 13;
  long double b;
};

struct a e(struct a f) {
  return f;
}
struct c g(struct c f) {
  return f;
}
void h() { g(d); }

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