[llvm-bugs] [Bug 37960] New: [debugify] ipsccp fail

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37960

            Bug ID: 37960
           Summary: [debugify] ipsccp fail
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: greg.bedwell at sony.com
                CC: anastasis.gramm2 at gmail.com, davide at freebsd.org,
                    llvm-bugs at lists.llvm.org, vsk at apple.com
            Blocks: 37953

Created attachment 20478
  --> https://bugs.llvm.org/attachment.cgi?id=20478&action=edit
ll reproducer

Silly testcase, but raising on the basis that no input (no matter how silly)
should be causing debugify fails.

$ clang -v
clang version 7.0.0 (trunk 335708) (llvm/trunk 335721)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: e:\work\upstream-llvm\build-vs2015-native-ninja\bin

$ cat interprocedural_sparse_conditional_constant_propagation.cpp
static void foo() {}
void bar() { foo; }

$ clang interprocedural_sparse_conditional_constant_propagation.cpp -O0 -Xclang
-disable-O0-optnone -S -emit-llvm -o ipsccp-input.ll
interprocedural_sparse_conditional_constant_propagation.cpp:2:14: warning:
expression result unused [-Wunused-value]
void bar() { foo; }
             ^~~
1 warning generated.

$ opt ipsccp-input.ll -disable-output -debugify-each -ipsccp
ERROR: Instruction with empty DebugLoc in function ?foo@@YAXXZ --  unreachable
WARNING: Missing line 2
CheckModuleDebugify [Interprocedural Sparse Conditional Constant Propagation]:
FAIL
CheckFunctionDebugify [Module Verifier]: PASS
CheckFunctionDebugify [Module Verifier]: PASS

$


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=37953
[Bug 37953] [meta] [debugify] fix -check-debugify failures
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