https://bugs.llvm.org/show_bug.cgi?id=37964
Bug ID: 37964
Summary: [debugify] gvn fail
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: greg.bedw...@sony.com
CC: anastasis.gra...@gmail.com, dav...@freebsd.org,
llvm-bugs@lists.llvm.org, v...@apple.com
Blocks: 37953
Created attachment 20482
--> https://bugs.llvm.org/attachment.cgi?id=20482&action=edit
ll reproducer
$ 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 global_value_numbering.cpp
int foo;
char bar();
void baz() {
for (;;)
for (; foo; foo = bar())
;
}
$ clang global_value_numbering.cpp -O0 -Xclang -disable-O0-optnone -emit-llvm
-S -o - | opt -O3 -opt-bisect-limit=51 -S -o gvn-input.ll 2>nul
$ opt -disable-output -debugify-each -gvn gvn-input.ll
ERROR: Instruction with empty DebugLoc in function ?baz@@YAXXZ -- %.pr1 = phi
i32 [ 0, %for.cond ], [ %conv, %for.cond.loopexit.loopexit ]
CheckFunctionDebugify [Global Value Numbering]: FAIL
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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