https://bugs.llvm.org/show_bug.cgi?id=40937
Bug ID: 40937
Summary: opt cannot terminate with "opt -instcombine
-structurizecfg -loop-extract -loop-rotate -newgvn
-loop-versioning -loop-extract"
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: csz...@163.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21553
--> https://bugs.llvm.org/attachment.cgi?id=21553&action=edit
.bc file of the source code
For this test case, opt cannot terminate. I have tested it using godbolt, and
the opt 6/7/truck versions all have this problem. The outputs of opt 6/7/truck
are as follows.
opt truck:
/compiler-explorer/c-preload/compiler-wrapper: line 21: 20300 Killed
"$@"
Compiler returned: 137
opt 7:
/compiler-explorer/c-preload/compiler-wrapper: line 21: 20621 Killed
"$@"
Compiler returned: 137
opt 6:
/compiler-explorer/c-preload/compiler-wrapper: line 21: 12475 Killed
"$@"
Compiler returned: 137
The followings are my test environment and test steps.
$clang -v
clang version 9.0.0 (trunk 354742)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/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/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c -o small.bc
$opt -instcombine -structurizecfg -loop-extract -loop-rotate -newgvn
-loop-versioning -loop-extract small.bc -o small-opt.bc
The following is the source code of small.c
a;
b() {
int c = 0;
for (; c; ++c)
if (a)
break;
}
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